{"messages":[{"content":"You are a constitutional council ranking individual git commits for ownership allocation.\n\nCompare these two commits. Decide which contributed more lasting value to the project.\n\nJudge substance, not spectacle:\n- Prefer correct, lasting design and real bugfixes over churn, formatting, renames, or generated noise.\n- Prefer clarity and necessity over sheer line count. A small precise change can beat a large diffuse one.\n- Do not favor a side merely because its patch is longer or noisier.\n- Weight what the change does for the project, not the contributor's name.\n\nReturn ONLY a JSON object: {\"winner\": \"A\" or \"B\", \"ratio\": \"N:M\", \"explanation\": \"...\"}\nThe explanation must cite concrete differences in the patches (1-3 sentences).\n\nSide A — contributor: tommy-mor\nSide A — commit message:\n[c99adc26] refactor forum into files\n\nSide A — unified diff (full patch):\ndiff --git a/bb.edn b/bb.edn\nindex 4680e82d4227057d2eea6041dc5647beb759131d..ce0f6fcd45a67ead3295b90db2a301e9b304f3da 100644\n--- a/bb.edn\n+++ b/bb.edn\n@@ -51,6 +51,11 @@\n    :requires ([test.walkthrough-fixture :as walkthrough-fixture])\n    :task (walkthrough-fixture/run-fixture)}\n \n+  sample-fixture\n+  {:doc \"macOS: run `sample` on process(es) listening on the fixture TCP port (default 8080). Usage: bb sample-fixture [PORT] [DURATION_SEC] [OUT_DIR]\"\n+   :requires ([scripts.sample-fixture :as sample-fixture])\n+   :task (apply sample-fixture/-main *command-line-args*)}\n+\n   perf\n   {:doc \"Performance test: concurrent HTTP requests to detect blocking I/O\"\n    :requires ([scripts.perf :as perf])\ndiff --git a/scripts/sample_fixture.bb b/scripts/sample_fixture.bb\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..ac2368623c5043ba6e027afef6b5b37d392767b0\n--- /dev/null\n+++ b/scripts/sample_fixture.bb\n@@ -0,0 +1,70 @@\n+(ns scripts.sample-fixture\n+  \"Find process(es) listening on the fixture port (default 8080) and run macOS `sample`.\"\n+  (:require [babashka.fs :as fs]\n+            [babashka.process :as p]\n+            [clojure.string :as str]))\n+\n+(defn- usage []\n+  (println \"Usage: bb sample-fixture [PORT] [DURATION_SEC] [OUT_DIR]\")\n+  (println \"\")\n+  (println \"  Finds PIDs bound to TCP LISTEN on PORT (default 8080), then runs\")\n+  (println \"  `sample` for each PID. OUT_DIR defaults to the current directory.\")\n+  (println \"\")\n+  (println \"  Example:  bb sample-fixture\")\n+  (println \"            bb sample-fixture 8080 10\")\n+  (println \"            bb sample-fixture 8080 5 /tmp\")\n+  (println \"\")\n+  (println \"  Requires macOS (the `sample` tool).\"))\n+\n+(defn- parse-long* [s]\n+  (try (Long/parseLong s)\n+       (catch NumberFormatException _ nil)))\n+\n+(defn- listen-pids [port]\n+  (let [spec (str \"TCP:\" port)\n+        {:keys [out exit]}\n+        @(p/process [\"lsof\" \"-nP\" (str \"-i\" spec) \"-sTCP:LISTEN\" \"-t\"]\n+                    {:out :string :err :string})]\n+    (when (zero? exit)\n+      (->> (str/split-lines out)\n+           (map str/trim)\n+           (remove str/blank?)\n+           (distinct)\n+           vec))))\n+\n+(defn- sample-bin []\n+  (or (fs/which \"sample\")\n+      (throw (ex-info \"macOS `sample` not found on PATH\" {}))))\n+\n+(defn- run-sample! [sample duration-sec pid out-file]\n+  (println (str \"sampling PID \" pid \" for \" duration-sec \"s → \" out-file))\n+  (let [{:keys [exit err]} @(p/process [sample (str pid) (str duration-sec) \"-file\" out-file]\n+                                      {:out :inherit :err :inherit})]\n+    (when-not (zero? exit)\n+      (binding [*out* *err*]\n+        (println \"sample failed:\" err))\n+      (System/exit exit))))\n+\n+(defn -main [& args]\n+  (when (some #{\"-h\" \"--help\" \"help\"} args)\n+    (usage)\n+    (System/exit 0))\n+  (let [port (or (some-> (first args) parse-long*) 8080)\n+        duration-sec (or (some-> (second args) parse-long*) 5)\n+        out-dir (or (nth args 2 nil) \".\")\n+        pids (listen-pids port)]\n+    (when (or (nil? pids) (empty? pids))\n+      (binding [*out* *err*]\n+        (println (str \"No process listening on TCP \" port \" (LISTEN). Is `bb fixture` running?\")))\n+      (System/exit 1))\n+    (when-not (fs/exists? out-dir)\n+      (binding [*out* *err*]\n+        (println \"Output directory does not exist:\" out-dir))\n+      (System/exit 1))\n+    (let [sample (sample-bin)\n+          ts (str (System/currentTimeMillis))]\n+      (println (str \"port \" port \" → PIDs \" (str/join \", \" pids)))\n+      (doseq [pid pids]\n+        (let [out-file (str (fs/path out-dir) \"/slug-sample-\" port \"-\" pid \"-\" ts \".txt\")]\n+          (run-sample! sample duration-sec pid (str out-file))))\n+      (println \"done.\"))))\ndiff --git a/server/src/html/forum.rs b/server/src/html/forum.rs\nindex a55fc1f79d03719eb74b216865b2c15199c48ea7..5ad8dfc84dd735d589432e2c613ff687a75f2e61 100644\n--- a/server/src/html/forum.rs\n+++ b/server/src/html/forum.rs\n@@ -380,22 +380,6 @@ fn room_members_inner(members: &[RoomMemberRow]) -> Markup {\n     }\n }\n \n-pub(crate) fn set_room_members_expanded_rpc(room_wire: &str, expanded: bool) -> String {\n-    template_json_compact(&HtmlUiAction::SetRoomMembersExpanded {\n-        room_wire: room_wire.to_string(),\n-        expanded,\n-    })\n-    .expect(\"static json\")\n-}\n-\n-pub(crate) fn set_room_new_thread_compose_expanded_rpc(nav: &ThreadNav, expanded: bool) -> String {\n-    template_json_compact(&HtmlUiAction::SetRoomNewThreadComposeExpanded {\n-        room_wire: nav.room_wire.clone(),\n-        expanded,\n-    })\n-    .expect(\"static json\")\n-}\n-\n /// Fragment for `#room-members-section` — expand/collapse is server-driven via `POST /ui`.\n pub(crate) fn room_members_section_markup(\n     reduced: &ReducerState,\n@@ -406,13 +390,14 @@ pub(crate) fn room_members_section_markup(\n     if members.is_empty() {\n         return html! {};\n     }\n-    let rpc_open = set_room_members_expanded_rpc(room_id, true);\n-    let rpc_close = set_room_members_expanded_rpc(room_id, false);\n     html! {\n         div id=\"room-members-section\" {\n             @if members_expanded {\n                 form method=\"POST\" action=\"/ui\" {\n-                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(rpc_close);\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomMembersExpanded {\n+                        room_wire: room_id.to_string(),\n+                        expanded: false,\n+                    }).expect(\"static json\"));\n                     button type=\"submit\" class=\"form-toggle\" aria-expanded=\"true\" {\n                         \"hide members & permissions\"\n                     }\n@@ -422,7 +407,10 @@ pub(crate) fn room_members_section_markup(\n                 }\n             } @else {\n                 form method=\"POST\" action=\"/ui\" {\n-                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(rpc_open);\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomMembersExpanded {\n+                        room_wire: room_id.to_string(),\n+                        expanded: true,\n+                    }).expect(\"static json\"));\n                     button type=\"submit\" class=\"form-toggle\" aria-expanded=\"false\" {\n                         \"members & permissions\"\n                     }\n@@ -514,28 +502,24 @@ fn compose_form(nav: &ThreadNav, thread_tag: &str, show: bool) -> Markup {\n     if !show {\n         return html! {};\n     }\n-    let rpc_post = template_json_compact(&json!({\n-        \"action\": \"post_ingest\",\n-        \"room\": nav.room_wire,\n-        \"thread_tag\": thread_tag,\n-        \"text\": {\"$form\": \"text\"},\n-        \"error_target\": \"thread-compose-errors\",\n-        \"form_id\": \"thread-compose-form\",\n-    }))\n-    .unwrap();\n-    let rpc_check = template_json_compact(&json!({\n-        \"action\": \"check_ingest\",\n-        \"room\": nav.room_wire,\n-        \"thread_tag\": thread_tag,\n-        \"text\": {\"$form\": \"text\"},\n-        \"error_target\": \"thread-compose-errors\",\n-        \"form_id\": \"thread-compose-form\",\n-    }))\n-    .unwrap();\n     html! {\n         section class=\"compose\" id=\"thread-compose\" {\n-            form id=\"thread-compose-form\" method=\"POST\" action=\"/ui\" data-check-action=\"/ui\" data-check-rpc=(rpc_check) {\n-                input type=\"hidden\" name=(UI_RPC_FIELD) value=(rpc_post);\n+            form id=\"thread-compose-form\" method=\"POST\" action=\"/ui\" data-check-action=\"/ui\" data-check-rpc=(template_json_compact(&json!({\n+                \"action\": \"check_ingest\",\n+                \"room\": nav.room_wire,\n+                \"thread_tag\": thread_tag,\n+                \"text\": {\"$form\": \"text\"},\n+                \"error_target\": \"thread-compose-errors\",\n+                \"form_id\": \"thread-compose-form\",\n+            })).unwrap()) {\n+                input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&json!({\n+                    \"action\": \"post_ingest\",\n+                    \"room\": nav.room_wire,\n+                    \"thread_tag\": thread_tag,\n+                    \"text\": {\"$form\": \"text\"},\n+                    \"error_target\": \"thread-compose-errors\",\n+                    \"form_id\": \"thread-compose-form\",\n+                })).unwrap());\n                 textarea name=\"text\" rows=\"5\" cols=\"80\" placeholder=\"prose or ~/items and votes…\" {}\n                 p {\n                     button type=\"submit\" { \"post\" }\n@@ -712,7 +696,7 @@ pub async fn home(\n             p class=\"muted\" { \"dark = time-ordered · light = vote-ranked\" }\n             div class=\"thread-feed-toolbar\" {\n                 form method=\"POST\" action=\"/ui\" {\n-                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(expand_public_new_thread_rpc_value());\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::ExpandPublicNewThreadForm).expect(\"static json\"));\n                     button type=\"submit\" class=\"section-add-btn\" { \"+\" }\n                 }\n             }\n@@ -1002,14 +986,15 @@ fn new_thread_form_for_room(nav: &ThreadNav, show: bool, compose_expanded: bool)\n     if !show {\n         return html! {};\n     }\n-    let rpc_open = set_room_new_thread_compose_expanded_rpc(nav, true);\n-    let rpc_close = set_room_new_thread_compose_expanded_rpc(nav, false);\n     // Single root for Idiomorph when morphing `#room-new-thread-ui-slot` (expanded has form + section).\n     html! {\n         div class=\"room-new-thread-slot-inner\" {\n             @if compose_expanded {\n                 form method=\"POST\" action=\"/ui\" {\n-                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(rpc_close);\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomNewThreadComposeExpanded {\n+                        room_wire: nav.room_wire.clone(),\n+                        expanded: false,\n+                    }).expect(\"static json\"));\n                     button type=\"submit\" class=\"form-toggle\" aria-expanded=\"true\" {\n                         \"-\"\n                     }\n@@ -1039,7 +1024,10 @@ fn new_thread_form_for_room(nav: &ThreadNav, show: bool, compose_expanded: bool)\n                 }\n             } @else {\n                 form method=\"POST\" action=\"/ui\" {\n-                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(rpc_open);\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomNewThreadComposeExpanded {\n+                        room_wire: nav.room_wire.clone(),\n+                        expanded: true,\n+                    }).expect(\"static json\"));\n                     button type=\"submit\" class=\"form-toggle\" aria-expanded=\"false\" {\n                         \"+\"\n                     }\n@@ -1049,10 +1037,6 @@ fn new_thread_form_for_room(nav: &ThreadNav, show: bool, compose_expanded: bool)\n     }\n }\n \n-pub(crate) fn expand_public_new_thread_rpc_value() -> String {\n-    template_json_compact(&HtmlUiAction::ExpandPublicNewThreadForm).expect(\"static json\")\n-}\n-\n pub(crate) fn login_to_post_hint_markup() -> Markup {\n     html! {\n         p class=\"muted\" { \"log in to post\" }\ndiff --git a/server/src/html/forum/access.rs b/server/src/html/forum/access.rs\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..f9f7139b63442a6ef3a927b77a72805f15feec3f\n--- /dev/null\n+++ b/server/src/html/forum/access.rs\n@@ -0,0 +1,16 @@\n+use crate::events::ThreadCapability;\n+use crate::reducer::ReducerState;\n+\n+pub(crate) fn user_can_view_room(reduced: &ReducerState, room_id: &str, username: Option<&str>) -> bool {\n+    if !reduced.rooms.contains(room_id) {\n+        return false;\n+    }\n+    let Some(u) = username else {\n+        return false;\n+    };\n+    reduced.user_has_cap(room_id, u, ThreadCapability::View)\n+}\n+\n+pub(crate) fn user_can_post_room(reduced: &ReducerState, room_id: &str, username: &str) -> bool {\n+    reduced.user_has_cap(room_id, username, ThreadCapability::Post)\n+}\ndiff --git a/server/src/html/forum/ingest.rs b/server/src/html/forum/ingest.rs\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..c045046a005db4f8f4d1dc7ea74aaaba45e0f3f4\n--- /dev/null\n+++ b/server/src/html/forum/ingest.rs\n@@ -0,0 +1,171 @@\n+use crate::canonical_path::canonicalize_tag;\n+use crate::form_template::template_json_compact;\n+use crate::reducer::{scope_from_room_wire, ReducerState};\n+use maud::{html, Markup};\n+use serde_json::json;\n+\n+use crate::html::js_string_literal;\n+use crate::html::ui_action::{HtmlUiAction, UI_RPC_FIELD};\n+use crate::html::{profile_href, render_linkified_with_embeds_in_scope, timeago};\n+\n+use super::nav::ThreadNav;\n+\n+/// `POST /ui` + `__rpc__` from an inline link (`onclick`); same-origin credentials as other morph actions.\n+pub(super) fn thread_ui_fetch_onclick(rpc_compact_json: &str) -> String {\n+    format!(\n+        \"fetch('/ui',{{method:'POST',headers:{{'Content-Type':'application/x-www-form-urlencoded'}},body:new URLSearchParams({{__rpc__:{}}}).toString(),credentials:'same-origin'}}).then(r=>r.text()).then(eval);return false\",\n+        js_string_literal(rpc_compact_json)\n+    )\n+}\n+\n+pub(super) fn thread_nav_for_ingest(ing: &crate::events::Ingest) -> Option<ThreadNav> {\n+    let room = ing.room_id.trim();\n+    if room.is_empty() || room == \"public\" {\n+        Some(ThreadNav::public())\n+    } else {\n+        ThreadNav::from_room_id(room)\n+    }\n+}\n+\n+pub(super) fn thread_post_index_in_scope(reduced: &ReducerState, ing: &crate::events::Ingest) -> Option<usize> {\n+    let scope = scope_from_room_wire(&ing.room_id);\n+    let tag = canonicalize_tag(&ing.thread_tag);\n+    reduced\n+        .ingests_by_scope_thread\n+        .get(&(scope, tag))\n+        .and_then(|q| q.iter().rev().position(|id| id == &ing.id))\n+}\n+\n+fn post_header_meta(\n+    nav: &ThreadNav,\n+    tag: &str,\n+    post_idx: usize,\n+    principal: &str,\n+    ts: i64,\n+    now: i64,\n+) -> Markup {\n+    let post_href = nav.post_url(tag, post_idx);\n+    let profile = profile_href(principal);\n+    let hover = timeago::rfc3339_utc(ts);\n+    let ago = timeago::timeago(now, ts);\n+    html! {\n+        div class=\"ingest-meta muted\" title=(hover) {\n+            a href=(post_href) class=\"post-num\" { \"#\" (post_idx) }\n+            \" \"\n+            a href=(profile) class=\"post-author\" { \"@\" (principal) }\n+            \" · \"\n+            (ago)\n+        }\n+    }\n+}\n+\n+pub(super) fn post_header_row(\n+    nav: &ThreadNav,\n+    tag: &str,\n+    post_idx: usize,\n+    ing: &crate::events::Ingest,\n+    _viewer: Option<&str>,\n+    now: i64,\n+    show_delete: bool,\n+) -> Markup {\n+    let meta = post_header_meta(nav, tag, post_idx, &ing.principal, ing.ts, now);\n+    html! {\n+        div class=\"ingest-header-row\" {\n+            (meta)\n+            @if show_delete {\n+                form class=\"post-delete-form\" method=\"POST\" action=\"/ui\" {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::RedactPost { post_id: ing.id.clone() }).unwrap());\n+                    button type=\"submit\" class=\"post-delete-btn\" { \"delete\" }\n+                }\n+            }\n+        }\n+    }\n+}\n+\n+pub(super) fn redacted_header_row(\n+    nav: &ThreadNav,\n+    tag: &str,\n+    post_idx: usize,\n+    ing: &crate::events::Ingest,\n+    now: i64,\n+    expanded: bool,\n+) -> Markup {\n+    let meta = post_header_meta(nav, tag, post_idx, &ing.principal, ing.ts, now);\n+    let rpc_expand = template_json_compact(&json!({\n+        \"action\": \"expand_redacted_post\",\n+        \"room\": nav.room_wire,\n+        \"thread_tag\": tag,\n+        \"post_index\": post_idx,\n+    }))\n+    .unwrap();\n+    let rpc_collapse = template_json_compact(&json!({\n+        \"action\": \"collapse_redacted_post\",\n+        \"room\": nav.room_wire,\n+        \"thread_tag\": tag,\n+        \"post_index\": post_idx,\n+    }))\n+    .unwrap();\n+    let onclick_expand = thread_ui_fetch_onclick(&rpc_expand);\n+    let onclick_collapse = thread_ui_fetch_onclick(&rpc_collapse);\n+    html! {\n+        div class=\"ingest-header-row ingest-tombstone-row\" {\n+            (meta)\n+            span class=\"post-tombstone-inline muted\" {\n+                \"deleted · \"\n+                @if expanded {\n+                    a href=\"#\" class=\"hide-deleted-link\"\n+                      onclick=(onclick_collapse) {\n+                        \"[hide deleted content]\"\n+                    }\n+                } @else {\n+                    a href=\"#\" class=\"show-deleted-link\"\n+                      onclick=(onclick_expand) {\n+                        \"[show deleted content]\"\n+                    }\n+                }\n+            }\n+        }\n+    }\n+}\n+\n+pub(super) fn ingest_entry_markup(\n+    nav: &ThreadNav,\n+    tag: &str,\n+    post_idx: usize,\n+    ing: &crate::events::Ingest,\n+    viewer: Option<&str>,\n+    now: i64,\n+    reduced: &ReducerState,\n+) -> Markup {\n+    let redacted = reduced.redacted_posts.contains(&ing.id);\n+    let show_delete = viewer == Some(ing.principal.as_str()) && !redacted;\n+    if redacted {\n+        html! {\n+            div class=\"ingest-entry ingest-redacted\" data-ingest-id=(ing.id) {\n+                (redacted_header_row(nav, tag, post_idx, ing, now, false))\n+            }\n+        }\n+    } else {\n+        let truncated = ing.raw.len() > 2000;\n+        let display_body = if truncated { &ing.raw[..2000] } else { &ing.raw[..] };\n+        html! {\n+            div class=\"ingest-entry\" data-ingest-id=(ing.id) {\n+                (post_header_row(nav, tag, post_idx, ing, viewer, now, show_delete))\n+                (render_linkified_with_embeds_in_scope(display_body, nav.garden_root_url()))\n+                @if truncated {\n+                    @let rpc_full = template_json_compact(&json!({\n+                        \"action\": \"expand_post_full\",\n+                        \"room\": nav.room_wire,\n+                        \"thread_tag\": tag,\n+                        \"post_index\": post_idx,\n+                    })).unwrap();\n+                    @let onclick_full = thread_ui_fetch_onclick(&rpc_full);\n+                    a href=\"#\" class=\"show-full-link\"\n+                      onclick=(onclick_full) {\n+                        \"[show full post]\"\n+                    }\n+                }\n+            }\n+        }\n+    }\n+}\ndiff --git a/server/src/html/forum/nav.rs b/server/src/html/forum/nav.rs\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..f5d437f2b1c6a0b727f1540d83774ba4e440f0b1\n--- /dev/null\n+++ b/server/src/html/forum/nav.rs\n@@ -0,0 +1,78 @@\n+use crate::canonical_path::canonicalize_item;\n+use crate::reducer::ScopeId;\n+\n+/// URL helpers for public `/t/…` and private room threads `/r/{short}/{slug}/t/…`.\n+#[derive(Clone)]\n+pub struct ThreadNav {\n+    pub room_wire: String,\n+    scope: ScopeId,\n+    room_path: String,\n+    thread_path_prefix: String,\n+    garden_path_prefix: String,\n+}\n+\n+impl ThreadNav {\n+    pub(crate) fn public() -> Self {\n+        Self {\n+            room_wire: \"public\".into(),\n+            scope: ScopeId::Public,\n+            room_path: \"/t\".into(),\n+            thread_path_prefix: \"/t\".into(),\n+            garden_path_prefix: \"/~\".into(),\n+        }\n+    }\n+\n+    /// `room_id` wire form `shortid/slug`.\n+    pub(crate) fn from_room_id(room_id: &str) -> Option<Self> {\n+        let (short, slug) = room_id.split_once('/')?;\n+        if short.is_empty() || slug.is_empty() {\n+            return None;\n+        }\n+        Some(Self {\n+            room_wire: room_id.to_string(),\n+            scope: ScopeId::Room(room_id.to_string()),\n+            room_path: format!(\"/r/{short}/{slug}\"),\n+            thread_path_prefix: format!(\"/r/{short}/{slug}/t\"),\n+            garden_path_prefix: format!(\"/r/{short}/{slug}/~\"),\n+        })\n+    }\n+\n+    pub(crate) fn scope(&self) -> ScopeId {\n+        self.scope.clone()\n+    }\n+\n+    pub(crate) fn room_url(&self) -> &str {\n+        &self.room_path\n+    }\n+\n+    pub(crate) fn thread_url(&self, tag: &str) -> String {\n+        format!(\"{}/{}\", self.thread_path_prefix, tag)\n+    }\n+\n+    pub(crate) fn garden_root_url(&self) -> &str {\n+        &self.garden_path_prefix\n+    }\n+\n+    pub(crate) fn garden_item_url(&self, item: &str) -> String {\n+        if let Some(tail) = crate::path_types::CanonicalItemUrl::parse(item)\n+            .and_then(|c| c.tilde_tail().map(str::to_owned))\n+        {\n+            format!(\"{}/{}\", self.garden_path_prefix, tail)\n+        } else {\n+            format!(\"{}/{}\", self.garden_path_prefix, canonicalize_item(item))\n+        }\n+    }\n+\n+    pub(crate) fn thread_page_url(&self, tag: &str, offset: usize) -> String {\n+        let base = self.thread_url(tag);\n+        if offset == 0 {\n+            base\n+        } else {\n+            format!(\"{base}?offset={offset}\")\n+        }\n+    }\n+\n+    pub(crate) fn post_url(&self, tag: &str, idx: usize) -> String {\n+        format!(\"{}/{}/{}\", self.thread_path_prefix, tag, idx)\n+    }\n+}\ndiff --git a/server/src/html/forum/new_thread.rs b/server/src/html/forum/new_thread.rs\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..b2d24b8ab3ec7eee0edd16bed8ee6605e49bf408\n--- /dev/null\n+++ b/server/src/html/forum/new_thread.rs\n@@ -0,0 +1,157 @@\n+use crate::form_template::template_json_compact;\n+use crate::html::ui_action::{HtmlUiAction, UI_RPC_FIELD};\n+use maud::{html, Markup};\n+use serde_json::json;\n+\n+use super::nav::ThreadNav;\n+\n+struct NewThreadIds {\n+    compose_section_id: &'static str,\n+    errors_id: &'static str,\n+    form_id: &'static str,\n+    tag_input_id: &'static str,\n+    text_input_id: Option<&'static str>,\n+}\n+\n+const PUBLIC_IDS: NewThreadIds = NewThreadIds {\n+    compose_section_id: \"public-new-thread-compose\",\n+    errors_id: \"public-new-thread-errors\",\n+    form_id: \"public-new-thread-form\",\n+    tag_input_id: \"new-thread-tag\",\n+    text_input_id: Some(\"new-thread-text\"),\n+};\n+\n+const ROOM_IDS: NewThreadIds = NewThreadIds {\n+    compose_section_id: \"room-new-thread-compose\",\n+    errors_id: \"room-new-thread-errors\",\n+    form_id: \"room-new-thread-form\",\n+    tag_input_id: \"room-new-tag\",\n+    text_input_id: None,\n+};\n+\n+#[derive(Clone, Copy)]\n+enum NewThreadComposeKind {\n+    /// Home page: no client-side check RPC; post template omits `error_target` / `form_id`.\n+    Public,\n+    /// Room page: `check_ingest` + error targets on post (matches thread compose).\n+    Room,\n+}\n+\n+/// Shared `<section class=\"compose\">` for creating a thread + first post.\n+fn new_thread_compose_section(room_wire: &str, ids: &NewThreadIds, kind: NewThreadComposeKind) -> Markup {\n+    let client_check = matches!(kind, NewThreadComposeKind::Room);\n+    let (tag_placeholder, text_placeholder, submit_label) = match kind {\n+        NewThreadComposeKind::Public => (\n+            \"thread-title-slug-here\",\n+            \"Hello threadgoers!! Behold my new thread!\",\n+            \"create thread / make first post\",\n+        ),\n+        NewThreadComposeKind::Room => (\n+            \"thread-topic-slug-here\",\n+            \"First post body…\",\n+            \"post\",\n+        ),\n+    };\n+\n+    html! {\n+        section class=\"compose\" id=(ids.compose_section_id) {\n+            div id=(ids.errors_id) {}\n+            @if client_check {\n+                form id=(ids.form_id) method=\"POST\" action=\"/ui\" data-check-action=\"/ui\" data-check-rpc=(template_json_compact(&json!({\n+                    \"action\": \"check_ingest\",\n+                    \"room\": room_wire,\n+                    \"thread_tag\": {\"$form\": \"thread_tag\"},\n+                    \"text\": {\"$form\": \"text\"},\n+                    \"error_target\": ids.errors_id,\n+                    \"form_id\": ids.form_id,\n+                })).unwrap()) {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&json!({\n+                        \"action\": \"post_ingest\",\n+                        \"room\": room_wire,\n+                        \"thread_tag\": {\"$form\": \"thread_tag\"},\n+                        \"text\": {\"$form\": \"text\"},\n+                        \"error_target\": ids.errors_id,\n+                        \"form_id\": ids.form_id,\n+                    })).unwrap());\n+                    input type=\"text\" id=(ids.tag_input_id) name=\"thread_tag\" pattern=\"[a-z0-9_\\\\-]{1,64}\" required placeholder=(tag_placeholder);\n+                    @if let Some(tid) = ids.text_input_id {\n+                        textarea id=(tid) name=\"text\" rows=\"4\" placeholder=(text_placeholder) required {}\n+                    } @else {\n+                        textarea name=\"text\" rows=\"4\" placeholder=(text_placeholder) required {}\n+                    }\n+                    p { button type=\"submit\" { (submit_label) } }\n+                }\n+            } @else {\n+                form id=(ids.form_id) method=\"POST\" action=\"/ui\" {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&json!({\n+                        \"action\": \"post_ingest\",\n+                        \"room\": room_wire,\n+                        \"thread_tag\": {\"$form\": \"thread_tag\"},\n+                        \"text\": {\"$form\": \"text\"},\n+                    })).unwrap());\n+                    input type=\"text\" id=(ids.tag_input_id) name=\"thread_tag\" pattern=\"[a-z0-9_\\\\-]{1,64}\" placeholder=(tag_placeholder);\n+                    @if let Some(tid) = ids.text_input_id {\n+                        textarea id=(tid) name=\"text\" rows=\"4\" placeholder=(text_placeholder) {}\n+                    } @else {\n+                        textarea name=\"text\" rows=\"4\" placeholder=(text_placeholder) {}\n+                    }\n+                    p { button type=\"submit\" { (submit_label) } }\n+                }\n+            }\n+        }\n+    }\n+}\n+\n+fn new_thread_form_public(show: bool) -> Markup {\n+    if !show {\n+        return html! {};\n+    }\n+    new_thread_compose_section(\"public\", &PUBLIC_IDS, NewThreadComposeKind::Public)\n+}\n+\n+fn new_thread_form_for_room(nav: &ThreadNav, show: bool, compose_expanded: bool) -> Markup {\n+    if !show {\n+        return html! {};\n+    }\n+    // Single root for Idiomorph when morphing `#room-new-thread-ui-slot` (expanded has form + section).\n+    html! {\n+        div class=\"room-new-thread-slot-inner\" {\n+            @if compose_expanded {\n+                form method=\"POST\" action=\"/ui\" {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomNewThreadComposeExpanded {\n+                        room_wire: nav.room_wire.clone(),\n+                        expanded: false,\n+                    }).expect(\"static json\"));\n+                    button type=\"submit\" class=\"form-toggle\" aria-expanded=\"true\" {\n+                        \"-\"\n+                    }\n+                }\n+                (new_thread_compose_section(&nav.room_wire, &ROOM_IDS, NewThreadComposeKind::Room))\n+            } @else {\n+                form method=\"POST\" action=\"/ui\" {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomNewThreadComposeExpanded {\n+                        room_wire: nav.room_wire.clone(),\n+                        expanded: true,\n+                    }).expect(\"static json\"));\n+                    button type=\"submit\" class=\"form-toggle\" aria-expanded=\"false\" {\n+                        \"+\"\n+                    }\n+                }\n+            }\n+        }\n+    }\n+}\n+\n+pub(crate) fn login_to_post_hint_markup() -> Markup {\n+    html! {\n+        p class=\"muted\" { \"log in to post\" }\n+    }\n+}\n+\n+pub(crate) fn fragment_public_new_thread_form(show: bool) -> Markup {\n+    new_thread_form_public(show)\n+}\n+\n+pub(crate) fn fragment_room_new_thread_form(nav: &ThreadNav, show: bool, compose_expanded: bool) -> Markup {\n+    new_thread_form_for_room(nav, show, compose_expanded)\n+}\ndiff --git a/server/src/html/forum/room_members.rs b/server/src/html/forum/room_members.rs\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..bc13d3eb8030f00799c90c47e689a876168f522c\n--- /dev/null\n+++ b/server/src/html/forum/room_members.rs\n@@ -0,0 +1,108 @@\n+use crate::events::ThreadCapability;\n+use crate::form_template::template_json_compact;\n+use crate::reducer::ReducerState;\n+use maud::{html, Markup};\n+\n+use crate::html::ui_action::{HtmlUiAction, UI_RPC_FIELD};\n+\n+#[derive(Clone)]\n+pub(super) struct RoomMemberRow {\n+    pub(super) username: String,\n+    pub(super) capabilities: Vec<&'static str>,\n+}\n+\n+fn capability_label(cap: ThreadCapability) -> &'static str {\n+    match cap {\n+        ThreadCapability::View => \"view\",\n+        ThreadCapability::Post => \"post\",\n+        ThreadCapability::Vote => \"vote\",\n+        ThreadCapability::AddItem => \"add_item\",\n+        ThreadCapability::Manage => \"manage\",\n+    }\n+}\n+\n+fn room_members_for_room(reduced: &ReducerState, room_id: &str) -> Vec<RoomMemberRow> {\n+    let mut rows: Vec<RoomMemberRow> = reduced\n+        .grants\n+        .get(room_id)\n+        .into_iter()\n+        .flat_map(|members| members.iter())\n+        .map(|(username, caps)| {\n+            let mut ordered = Vec::new();\n+            for cap in [\n+                ThreadCapability::View,\n+                ThreadCapability::Post,\n+                ThreadCapability::Vote,\n+                ThreadCapability::AddItem,\n+                ThreadCapability::Manage,\n+            ] {\n+                if caps.contains(&cap) {\n+                    ordered.push(capability_label(cap));\n+                }\n+            }\n+            RoomMemberRow {\n+                username: username.clone(),\n+                capabilities: ordered,\n+            }\n+        })\n+        .collect();\n+    rows.sort_by(|a, b| a.username.cmp(&b.username));\n+    rows\n+}\n+\n+fn room_members_inner(members: &[RoomMemberRow]) -> Markup {\n+    html! {\n+        h3 { \"members\" }\n+        ul class=\"room-members\" {\n+            @for member in members {\n+                li {\n+                    span class=\"room-member-name\" { \"@\" (member.username) }\n+                    span class=\"muted\" {\n+                        \" · \"\n+                        (member.capabilities.join(\", \"))\n+                    }\n+                }\n+            }\n+        }\n+    }\n+}\n+\n+/// Fragment for `#room-members-section` — expand/collapse is server-driven via `POST /ui`.\n+pub(crate) fn room_members_section_markup(\n+    reduced: &ReducerState,\n+    room_id: &str,\n+    members_expanded: bool,\n+) -> Markup {\n+    let members = room_members_for_room(reduced, room_id);\n+    if members.is_empty() {\n+        return html! {};\n+    }\n+    html! {\n+        div id=\"room-members-section\" {\n+            @if members_expanded {\n+                form method=\"POST\" action=\"/ui\" {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomMembersExpanded {\n+                        room_wire: room_id.to_string(),\n+                        expanded: false,\n+                    }).expect(\"static json\"));\n+                    button type=\"submit\" class=\"form-toggle\" aria-expanded=\"true\" {\n+                        \"hide members & permissions\"\n+                    }\n+                }\n+                section class=\"room-members-panel\" {\n+                    (room_members_inner(&members))\n+                }\n+            } @else {\n+                form method=\"POST\" action=\"/ui\" {\n+                    input type=\"hidden\" name=(UI_RPC_FIELD) value=(template_json_compact(&HtmlUiAction::SetRoomMembersExpanded {\n+                        room_wire: room_id.to_string(),\n+                        expanded: true,\n+                    }).expect(\"static json\"));\n+                    button type=\"submit\" class=\"form-toggle\" aria-expanded=\"false\" {\n+                        \"members & permissions\"\n+                    }\n+                }\n+            }\n+        }\n+    }\n+}\n\n\nSide B — contributor: tommy-mor\nSide B — commit message:\n[cdeb4072] tree nixed\n\nSide B — unified diff (full patch):\ndiff --git a/server/src/html/mod.rs b/server/src/html/mod.rs\nindex 82c5993fabfeaf2ea8b9034bccaef37924100264..9c5af9654c7010d2cdb100e4cf63ba63e77c8c57 100644\n--- a/server/src/html/mod.rs\n+++ b/server/src/html/mod.rs\n@@ -12,7 +12,6 @@ mod editor;\n mod forum;\n mod garden;\n mod search;\n-mod tree;\n use breadcrumb_path::OntologyPath;\n \n pub use auth::{auth_complete_page, auth_signed_in_fragment, choose_username_error_fragment, choose_username_page};\n@@ -20,7 +19,6 @@ pub use editor::{editor_check, editor_page};\n pub use forum::{index, thread_feed_html, thread_post_expand, thread_post_view, thread_view};\n pub use garden::{garden_index, ontology_path};\n pub use search::{search_page, search_results_fragment};\n-pub use tree::{tree_path, tree_root, tree_select, tree_toggle};\n \n // Embed CSS files at compile time\n const THEME_DEFAULT_CSS: &str = include_str!(\"../../static/theme_default.css\");\ndiff --git a/server/src/html/tree.rs b/server/src/html/tree.rs\ndeleted file mode 100644\nindex 6aed7db08682f088df3d52d0358b8dc954e9e1df..0000000000000000000000000000000000000000\n--- a/server/src/html/tree.rs\n+++ /dev/null\n@@ -1,819 +0,0 @@\n-use axum::{\n-    extract::{Path, State},\n-    http::{header, StatusCode},\n-    response::{Html, IntoResponse, Response},\n-    Form,\n-};\n-use axum::response::Redirect;\n-use axum_extra::extract::Query;\n-use base64::engine::general_purpose::URL_SAFE_NO_PAD;\n-use base64::Engine as _;\n-use maud::{html, Markup};\n-use serde::{Deserialize, Serialize};\n-use std::collections::BTreeSet;\n-\n-use crate::{\n-    canonical_path::canonicalize_item,\n-    path_types::{CanonicalItemUrl, RelativePath},\n-    scope_rank::ChildrenRankings,\n-    state::AppState,\n-};\n-\n-// Convenience alias used throughout this module.\n-type CanonSet = BTreeSet<CanonicalItemUrl>;\n-\n-use super::{layout, render_linkified_with_embeds};\n-\n-/// Query-state for the expandable tree UI.\n-#[derive(Debug, Clone, Default, Deserialize)]\n-pub struct TreeQuery {\n-    /// Opaque state blob (base64url postcard).\n-    #[serde(default)]\n-    pub s: Option<String>,\n-}\n-\n-#[derive(Debug, Clone, Serialize, Deserialize)]\n-struct TreeStateV1 {\n-    v: u8,\n-    #[serde(default)]\n-    open: Vec<String>,\n-    #[serde(default)]\n-    selected: Option<String>,\n-}\n-\n-// Note: TreeStateV1/V2 intentionally use raw `String` / `Vec<String>` because\n-// they are wire-format structs serialised with postcard.  All semantic types\n-// (`CanonicalItemUrl`, `RelativePath`) are used in the in-memory\n-// `DecodedTreeState` and in every function that works with live data.\n-\n-#[derive(Debug, Clone, Serialize, Deserialize)]\n-enum SelectedRefV2 {\n-    /// Index into the expanded open list.\n-    I(u32),\n-}\n-\n-#[derive(Debug, Clone, Serialize, Deserialize)]\n-struct TreeStateV2 {\n-    v: u8,\n-    /// Common prefix shared by open paths (and optionally selected), ending on a `/` boundary.\n-    #[serde(default)]\n-    base: String,\n-    /// Each entry is a relative path suffix (joined with `base`).\n-    #[serde(default)]\n-    open_suffixes: Vec<String>,\n-    #[serde(default)]\n-    selected: Option<SelectedRefV2>,\n-}\n-\n-#[derive(Debug, Clone)]\n-struct DecodedTreeState {\n-    open: CanonSet,\n-    selected: Option<CanonicalItemUrl>,\n-}\n-\n-fn common_base_boundary(paths: &[String]) -> String {\n-    if paths.is_empty() {\n-        return String::new();\n-    }\n-    let mut prefix = paths[0].as_str();\n-    for p in &paths[1..] {\n-        let mut i = 0usize;\n-        let bytes_a = prefix.as_bytes();\n-        let bytes_b = p.as_bytes();\n-        let n = bytes_a.len().min(bytes_b.len());\n-        while i < n && bytes_a[i] == bytes_b[i] {\n-            i += 1;\n-        }\n-        prefix = &prefix[..i];\n-        if prefix.is_empty() {\n-            break;\n-        }\n-    }\n-    // Snap to last '/' boundary (include the slash).\n-    match prefix.rfind('/') {\n-        None => String::new(),\n-        Some(idx) => prefix[..=idx].to_string(),\n-    }\n-}\n-\n-fn canon_root(root: &str) -> Option<CanonicalItemUrl> {\n-    CanonicalItemUrl::parse(root)\n-}\n-\n-fn canon_to_relative(root: &CanonicalItemUrl, item: &str) -> Option<RelativePath> {\n-    // Only support ontology items under the same root.\n-    let root_str = root.as_str();\n-    let item_can = canonicalize_item(item);\n-    if item_can.is_empty() {\n-        return None;\n-    }\n-    // Root must be ontology (`https://slug.social/~/...`)\n-    root.tilde_tail()?;\n-    if item_can == root_str {\n-        return RelativePath::new(\"\");\n-    }\n-    let prefix = if root_str.ends_with('/') {\n-        root_str.to_string()\n-    } else {\n-        format!(\"{}/\", root_str)\n-    };\n-    if !item_can.starts_with(&prefix) {\n-        return None;\n-    }\n-    let suffix = &item_can[prefix.len()..];\n-    RelativePath::new(suffix)\n-}\n-\n-fn relative_to_canon(root: &CanonicalItemUrl, rel: &RelativePath) -> Option<CanonicalItemUrl> {\n-    rel.join_under_ontology_root(root)\n-}\n-\n-fn encode_state_blob_v2(\n-    root: &str,\n-    open: &CanonSet,\n-    selected: Option<&CanonicalItemUrl>,\n-) -> String {\n-    let Some(root_can) = canon_root(root) else {\n-        return String::new();\n-    };\n-\n-    // Convert to sorted relative paths (strings for wire encoding).\n-    let mut rels: Vec<String> = open\n-        .iter()\n-        .filter_map(|it| canon_to_relative(&root_can, it.as_str()).map(|r| r.0.clone()))\n-        .collect();\n-    rels.sort();\n-    rels.dedup();\n-\n-    let sel_rel: Option<String> = selected\n-        .and_then(|s| canon_to_relative(&root_can, s.as_str()))\n-        .map(|r| r.0.clone());\n-\n-    // In v2 we enforce: selected ∈ open. This allows selected to be encoded as an index only.\n-    if let Some(sr) = &sel_rel {\n-        rels.push(sr.clone());\n-        rels.sort();\n-        rels.dedup();\n-    }\n-\n-    // base dedupe over open rels + selection (if present)\n-    let mut base_inputs = rels.clone();\n-    if let Some(sr) = &sel_rel {\n-        base_inputs.push(sr.clone());\n-    }\n-    let base = common_base_boundary(&base_inputs);\n-\n-    let open_suffixes: Vec<String> = rels\n-        .iter()\n-        .map(|r| r.strip_prefix(&base).unwrap_or(r).to_string())\n-        .collect();\n-\n-    let selected_ref: Option<SelectedRefV2> = sel_rel.and_then(|full| {\n-        rels.iter()\n-            .position(|r| r == &full)\n-            .map(|idx| SelectedRefV2::I(idx as u32))\n-    });\n-\n-    let st = TreeStateV2 {\n-        v: 2,\n-        base,\n-        open_suffixes,\n-        selected: selected_ref,\n-    };\n-    let bytes = postcard::to_allocvec(&st).unwrap_or_default();\n-    URL_SAFE_NO_PAD.encode(bytes)\n-}\n-\n-fn decode_state_blob_any(root: &str, s: &str) -> Option<DecodedTreeState> {\n-    let root_can = canon_root(root)?;\n-    let bytes = URL_SAFE_NO_PAD.decode(s).ok()?;\n-    // Try v2 first.\n-    if let Ok(st2) = postcard::from_bytes::<TreeStateV2>(&bytes) {\n-        if st2.v == 2 {\n-            let mut open: CanonSet = BTreeSet::new();\n-            for suf in st2.open_suffixes {\n-                let full_rel = format!(\"{}{}\", st2.base, suf);\n-                if let Some(rp) = RelativePath::new(&full_rel) {\n-                    if let Some(c) = relative_to_canon(&root_can, &rp) {\n-                        open.insert(c);\n-                    }\n-                }\n-            }\n-            let selected: Option<CanonicalItemUrl> = match st2.selected {\n-                None => None,\n-                Some(SelectedRefV2::I(i)) => {\n-                    let idx = i as usize;\n-                    // Index into the sorted open set (BTreeSet iteration is sorted).\n-                    open.iter().nth(idx).cloned()\n-                }\n-                // v2 always encodes selected as an index; no string fallback\n-            };\n-            return Some(DecodedTreeState { open, selected });\n-        }\n-    }\n-    // Fallback v1 (stored canonical-ish strings).\n-    let st1: TreeStateV1 = postcard::from_bytes(&bytes).ok()?;\n-    if st1.v != 1 {\n-        return None;\n-    }\n-    let open: CanonSet = st1\n-        .open\n-        .into_iter()\n-        .filter_map(|s| CanonicalItemUrl::parse(&canonicalize_item(&s)))\n-        .collect();\n-    let selected = st1\n-        .selected\n-        .as_ref()\n-        .and_then(|s| CanonicalItemUrl::parse(&canonicalize_item(s)));\n-    Some(DecodedTreeState { open, selected })\n-}\n-\n-fn baseline_state_blob() -> String {\n-    // Root doesn't affect empty state; V2 encodes open=[], selected=None.\n-    // We still build it via V2 encoder for forward-compat.\n-    encode_state_blob_v2(\"https://slug.social/~/\", &CanonSet::new(), None)\n-}\n-\n-fn href_for(root: &str, open: &CanonSet, selected: Option<&CanonicalItemUrl>) -> String {\n-    let blob = encode_state_blob_v2(root, open, selected);\n-    let base = format!(\"/tree/{}\", root.trim_start_matches(\"https://slug.social/~/\"))\n-        .trim_end_matches('/')\n-        .to_string();\n-    format!(\"{base}?s={blob}\")\n-}\n-\n-fn tree_root_from_path(path: Option<&str>) -> String {\n-    // Interpret /tree and /tree/*path as `~/...` under slug.social.\n-    // Empty path => \"~/\"\n-    match path {\n-        None => canonicalize_item(\"~/\"),\n-        Some(p) if p.trim().is_empty() => canonicalize_item(\"~/\"),\n-        Some(p) => canonicalize_item(&format!(\"~/{}\", p.trim_start_matches('/'))),\n-    }\n-}\n-\n-fn ranked_children_public(\n-    reduced: &crate::reducer::ReducerState,\n-    parent: &str,\n-) -> Vec<CanonicalItemUrl> {\n-    // Reducer parent keys are derived from `item_parent_path`, which uses\n-    // item_children uses \"https://slug.social/~\" (no trailing slash) as the root\n-    // parent key. Use ontology_root() for the root case, or parse the given parent.\n-    let parent_can = if parent.trim_end_matches('/') == \"https://slug.social/~\" || parent == \"https://slug.social/~/\" {\n-        CanonicalItemUrl::ontology_root()\n-    } else {\n-        CanonicalItemUrl::parse(parent.trim_end_matches('/'))\n-            .unwrap_or_else(CanonicalItemUrl::ontology_root)\n-    };\n-    let rankings: ChildrenRankings =\n-        crate::scope_rank::build_children_rankings(reduced.public(), &parent_can);\n-    let mut out: Vec<CanonicalItemUrl> = Vec::new();\n-    let mut seen: std::collections::HashSet<CanonicalItemUrl> = std::collections::HashSet::new();\n-\n-    for comp in rankings.component_rankings {\n-        for r in comp.ranked {\n-            seen.insert(r.item.clone());\n-            out.push(r.item);\n-        }\n-    }\n-    for it in rankings.unranked_items {\n-        seen.insert(it.clone());\n-        out.push(it);\n-    }\n-\n-    // Also surface phantom intermediate nodes: keys of item_children that are\n-    // direct children of parent but were never explicitly ingested as items\n-    // (so they don't appear in any ranking). Example: ~/languages exists only as\n-    // a parent of ~/languages/rust etc., never ranked at the root level.\n-    let phantom_parent_prefix = format!(\"{}/\", parent_can.as_str());\n-    for key in reduced.public().item_children.keys() {\n-        let key_str = key.as_str();\n-        if !key_str.starts_with(&phantom_parent_prefix) {\n-            continue;\n-        }\n-        // Must be a direct child: no further '/' after the prefix.\n-        let tail = &key_str[phantom_parent_prefix.len()..];\n-        if tail.contains('/') {\n-            continue;\n-        }\n-        if seen.contains(key) {\n-            continue;\n-        }\n-        seen.insert(key.clone());\n-        out.push(key.clone());\n-    }\n-\n-    out\n-}\n-\n-fn node_id(path: &str) -> String {\n-    // Stable DOM id derived from canonical path.\n-    let mut h: u64 = 1469598103934665603; // FNV-1a 64-bit offset basis\n-    for b in path.as_bytes() {\n-        h ^= *b as u64;\n-        h = h.wrapping_mul(1099511628211);\n-    }\n-    format!(\"node-{:016x}\", h)\n-}\n-\n-fn render_tree_node(\n-    reduced: &crate::reducer::ReducerState,\n-    path: &CanonicalItemUrl,\n-    root: &str,\n-    open: &CanonSet,\n-    selected: Option<&CanonicalItemUrl>,\n-) -> Markup {\n-    let path_str = path.as_str();\n-    let id = node_id(path_str);\n-    let is_open = open.contains(path);\n-    let is_selected = selected == Some(path);\n-\n-    let children: Vec<CanonicalItemUrl> = if is_open {\n-        ranked_children_public(reduced, path_str)\n-    } else {\n-        vec![]\n-    };\n-\n-    let label = path.last_segment().to_string();\n-    let has_children = reduced\n-        .public()\n-        .item_children\n-        .get(path_str)\n-        .map(|s| !s.is_empty())\n-        .unwrap_or(false);\n-\n-    let row_cls = if is_selected { \"tree-row selected\" } else { \"tree-row\" };\n-    let twist = if has_children {\n-        if is_open { \"▾\" } else { \"▸\" }\n-    } else {\n-        \" \"\n-    };\n-\n-    let state_blob = encode_state_blob_v2(root, open, selected);\n-\n-    html! {\n-        // Children are nested inside the li so the bevel border on .tree-children\n-        // is the only structural indicator of depth — no explicit padding math.\n-        li id=(id) class=(row_cls) {\n-            @if has_children {\n-                form method=\"post\" action=\"/tree/toggle\" class=\"tree-toggle-form\" {\n-                    input type=\"hidden\" name=\"root\" value=(root);\n-                    input type=\"hidden\" name=\"target\" value=(path_str);\n-                    input type=\"hidden\" name=\"s\" value=(state_blob);\n-                    button type=\"submit\" class=\"tree-twist\" title=\"toggle\" { (twist) }\n-                }\n-            } @else {\n-                span class=\"tree-twist\" { (twist) }\n-            }\n-\n-            form method=\"post\" action=\"/tree/select\" class=\"tree-select-form\" {\n-                input type=\"hidden\" name=\"root\" value=(root);\n-                input type=\"hidden\" name=\"target\" value=(path_str);\n-                input type=\"hidden\" name=\"s\" value=(state_blob);\n-                button type=\"submit\" class=\"tree-label\" { code { (label) } }\n-            }\n-\n-            @if is_open && !children.is_empty() {\n-                ul class=\"tree-children\" {\n-                    @for child in &children {\n-                        (render_tree_node(reduced, child, root, open, selected))\n-                    }\n-                }\n-            }\n-        }\n-    }\n-}\n-\n-fn render_tree_pane(\n-    reduced: &crate::reducer::ReducerState,\n-    root: &str,\n-    open: &CanonSet,\n-    selected: Option<&CanonicalItemUrl>,\n-) -> Markup {\n-    let roots: Vec<CanonicalItemUrl> = ranked_children_public(reduced, root);\n-    html! {\n-        div id=\"tree-pane\" {\n-            div class=\"muted\" { \"tree: \" code { \"~/\" (root.strip_prefix(\"https://slug.social/~/\").unwrap_or(\"\")) } }\n-            ul class=\"tree-list\" {\n-                @for r in roots {\n-                    (render_tree_node(reduced, &r, root, open, selected))\n-                }\n-            }\n-        }\n-    }\n-}\n-\n-fn render_detail_pane(\n-    reduced: &crate::reducer::ReducerState,\n-    selected: Option<&CanonicalItemUrl>,\n-) -> Markup {\n-    let Some(sel) = selected else {\n-        return html! {\n-            div id=\"detail-pane\" {\n-                p class=\"muted\" { \"select a node\" }\n-            }\n-        };\n-    };\n-    let sel_str = sel.as_str();\n-    let body = reduced.public().item_bodies.get(sel).cloned();\n-    html! {\n-        div id=\"detail-pane\" {\n-            h3 { \"selected\" }\n-            p { code { (sel_str) } }\n-            @if let Some(b) = body {\n-                (render_linkified_with_embeds(&b))\n-            } @else {\n-                p class=\"muted\" { \"no body yet\" }\n-            }\n-        }\n-    }\n-}\n-\n-fn tree_page_js() -> String {\n-    // Intercept all tree forms (toggle + select) ourselves so we can eval() the JS\n-    // response.  We call stopPropagation() to prevent the global layout POST handler\n-    // from also firing (it discards the response body and rewrites button text).\n-    r#\"\n-(function() {\n-  async function treePost(action, formData, btn) {\n-    try {\n-      if (btn) btn.disabled = true;\n-      const r = await fetch(action, {\n-        method: 'POST',\n-        body: new URLSearchParams(formData),\n-        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },\n-        credentials: 'same-origin',\n-      });\n-      const js = await r.text();\n-      eval(js);\n-    } finally {\n-      if (btn) btn.disabled = false;\n-    }\n-  }\n-\n-  function interceptTreeForms() {\n-    document.querySelectorAll('form.tree-toggle-form, form.tree-select-form').forEach((f) => {\n-      if (f.__tree_bound) return;\n-      f.__tree_bound = true;\n-      f.addEventListener('submit', (e) => {\n-        e.preventDefault();\n-        e.stopPropagation();\n-        const btn = f.querySelector('button[type=\"submit\"]');\n-        treePost(f.action, new FormData(f), btn);\n-      });\n-    });\n-  }\n-\n-  interceptTreeForms();\n-  const mo = new MutationObserver(() => interceptTreeForms());\n-  mo.observe(document.body, { subtree: true, childList: true });\n-})();\n-\"#\n-    .to_string()\n-}\n-\n-pub async fn tree_root(\n-    State(state): State<AppState>,\n-    Query(q): Query<TreeQuery>,\n-) -> impl IntoResponse {\n-    tree_render(State(state), Path(\"\".to_string()), Query(q)).await\n-}\n-\n-pub async fn tree_path(\n-    State(state): State<AppState>,\n-    Path(path): Path<String>,\n-    Query(q): Query<TreeQuery>,\n-) -> impl IntoResponse {\n-    tree_render(State(state), Path(path), Query(q)).await\n-}\n-\n-async fn tree_render(\n-    State(state): State<AppState>,\n-    Path(path): Path<String>,\n-    Query(q): Query<TreeQuery>,\n-) -> axum::response::Response {\n-    let root = tree_root_from_path(Some(&path));\n-    if path.trim().is_empty() {\n-        // /tree maps to \"~/\"\n-    }\n-\n-    let blob = match q.s.as_deref().map(str::trim) {\n-        None | Some(\"\") => {\n-            let base = format!(\"/tree/{}\", root.trim_start_matches(\"https://slug.social/~/\"))\n-                .trim_end_matches('/')\n-                .to_string();\n-            let loc = format!(\"{base}?s={}\", baseline_state_blob());\n-            // Use 302; good enough for browser refresh/share flows here.\n-            return Redirect::temporary(&loc).into_response();\n-        }\n-        Some(s) => s,\n-    };\n-    let Some(decoded) = decode_state_blob_any(&root, blob) else {\n-        return (StatusCode::BAD_REQUEST, \"invalid state blob\").into_response();\n-    };\n-    let open = decoded.open;\n-    let selected = decoded.selected;\n-\n-    let reduced = state.reduced.read().await;\n-    let tree = render_tree_pane(&reduced, &root, &open, selected.as_ref());\n-    let detail = render_detail_pane(&reduced, selected.as_ref());\n-\n-    let page = layout(\n-        \"tree — slug.social\",\n-        \"view-tree\",\n-        html! {\n-            style { (maud::PreEscaped(r#\"\n-              .tree-shell { padding: 14px; padding-right: calc(360px + 18px); }\n-              .tree-list, .tree-children { list-style: none; margin: 0; padding: 0; }\n-              .tree-children {\n-                margin-left: 10px;\n-                margin-top: 2px;\n-                padding-left: 10px;\n-              }\n-              .tree-row { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px; min-height: 22px; padding: 1px 0; }\n-              .tree-row.selected > .tree-select-form > .tree-label code { background: rgba(255,255,255,0.07); border-radius: 2px; }\n-              .tree-twist {\n-                font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, \"Liberation Mono\", \"Courier New\", monospace;\n-                background: transparent; border: 0; padding: 0 2px; cursor: pointer; color: inherit; flex-shrink: 0;\n-              }\n-              .tree-label {\n-                background: transparent; border: 0; padding: 0; cursor: pointer;\n-                color: inherit; text-align: left; font: inherit;\n-              }\n-              .tree-label code { font-size: 12px; }\n-              .tree-toggle-form, .tree-select-form { display: inline; margin: 0; }\n-              #detail-pane {\n-                position: fixed; top: 0; right: 0; width: 360px; height: 100vh;\n-                overflow-y: auto; border-left: 1px solid rgba(128,128,128,0.2);\n-                padding: 14px; box-sizing: border-box; z-index: 10;\n-              }\n-              #detail-pane pre { white-space: pre-wrap; }\n-            \"#)) }\n-            h2 { \"tree\" }\n-            p class=\"muted\" {\n-                \"state is fully encoded in \"\n-                code { \"?s=...\" }\n-            }\n-            div class=\"tree-shell\" {\n-                (tree)\n-                (detail)\n-            }\n-            script { (maud::PreEscaped(tree_page_js())) }\n-        },\n-        None,\n-    );\n-\n-    Html(page.into_string()).into_response()\n-}\n-\n-#[derive(Debug, Deserialize)]\n-pub struct ToggleForm {\n-    pub root: String,\n-    pub target: String,\n-    #[serde(default)]\n-    pub s: Option<String>,\n-}\n-\n-/// POST /tree/toggle\n-/// Returns JS that morphs the tree pane and updates the URL.\n-pub async fn tree_toggle(\n-    State(state): State<AppState>,\n-    Form(f): Form<ToggleForm>,\n-) -> impl IntoResponse {\n-    let root = canonicalize_item(&f.root);\n-    let target = canonicalize_item(&f.target);\n-\n-    if root.is_empty() || target.is_empty() {\n-        return (StatusCode::BAD_REQUEST, \"missing root/target\").into_response();\n-    }\n-\n-    let Some(ref blob) = f.s else {\n-        return (StatusCode::BAD_REQUEST, \"missing state\").into_response();\n-    };\n-    let Some(decoded) = decode_state_blob_any(&root, blob) else {\n-        return (StatusCode::BAD_REQUEST, \"invalid state\").into_response();\n-    };\n-    let target_can = match CanonicalItemUrl::parse(&target) {\n-        Some(c) => c,\n-        None => return (StatusCode::BAD_REQUEST, \"invalid target\").into_response(),\n-    };\n-    let mut open: CanonSet = decoded.open;\n-\n-    if open.contains(&target_can) {\n-        open.remove(&target_can);\n-    } else {\n-        open.insert(target_can.clone());\n-    }\n-\n-    let selected: Option<CanonicalItemUrl> = decoded\n-        .selected\n-        .or(Some(target_can));\n-\n-    let reduced = state.reduced.read().await;\n-    let new_tree_html = render_tree_pane(&reduced, &root, &open, selected.as_ref()).into_string();\n-    let new_detail_html = render_detail_pane(&reduced, selected.as_ref()).into_string();\n-    drop(reduced);\n-\n-    let next_url = href_for(&root, &open, selected.as_ref());\n-\n-    // Escape for template literal\n-    let esc = |s: String| s.replace('\\\\', \"\\\\\\\\\").replace('`', \"\\\\`\").replace(\"${\", \"\\\\${\");\n-    let tree_esc = esc(new_tree_html);\n-    let detail_esc = esc(new_detail_html);\n-    let url_esc = next_url.replace('\\\\', \"\\\\\\\\\").replace('`', \"\\\\`\").replace(\"'\", \"\\\\'\");\n-\n-    let js = format!(\n-        \"Idiomorph.morph(document.getElementById('tree-pane'), `{tree_esc}`);\\\n-         Idiomorph.morph(document.getElementById('detail-pane'), `{detail_esc}`);\\\n-         history.replaceState(null, '', '{url_esc}');\"\n-    );\n-\n-    Response::builder()\n-        .status(StatusCode::OK)\n-        .header(header::CONTENT_TYPE, \"text/javascript; charset=utf-8\")\n-        .body(js)\n-        .unwrap()\n-        .into_response()\n-}\n-\n-#[derive(Debug, Deserialize)]\n-pub struct SelectForm {\n-    pub root: String,\n-    pub target: String,\n-    #[serde(default)]\n-    pub s: Option<String>,\n-}\n-\n-/// POST /tree/select\n-/// Changes `selected` to `target` without altering the open set.\n-/// Returns JS that morphs both panes and updates the browser URL.\n-pub async fn tree_select(\n-    State(state): State<AppState>,\n-    Form(f): Form<SelectForm>,\n-) -> impl IntoResponse {\n-    let root = canonicalize_item(&f.root);\n-    let target = canonicalize_item(&f.target);\n-\n-    if root.is_empty() || target.is_empty() {\n-        return (StatusCode::BAD_REQUEST, \"missing root/target\").into_response();\n-    }\n-    let target_can = match CanonicalItemUrl::parse(&target) {\n-        Some(c) => c,\n-        None => return (StatusCode::BAD_REQUEST, \"invalid target\").into_response(),\n-    };\n-\n-    // Preserve the existing open set; only selection changes.\n-    let open: CanonSet = f\n-        .s\n-        .as_deref()\n-        .and_then(|blob| decode_state_blob_any(&root, blob))\n-        .map(|d| d.open)\n-        .unwrap_or_default();\n-\n-    let selected = Some(target_can);\n-\n-    let reduced = state.reduced.read().await;\n-    let new_tree_html = render_tree_pane(&reduced, &root, &open, selected.as_ref()).into_string();\n-    let new_detail_html = render_detail_pane(&reduced, selected.as_ref()).into_string();\n-    drop(reduced);\n-\n-    let next_url = href_for(&root, &open, selected.as_ref());\n-\n-    let esc = |s: String| s.replace('\\\\', \"\\\\\\\\\").replace('`', \"\\\\`\").replace(\"${\", \"\\\\${\");\n-    let tree_esc = esc(new_tree_html);\n-    let detail_esc = esc(new_detail_html);\n-    let url_esc = next_url.replace('\\\\', \"\\\\\\\\\").replace('`', \"\\\\`\").replace(\"'\", \"\\\\'\");\n-\n-    let js = format!(\n-        \"Idiomorph.morph(document.getElementById('tree-pane'), `{tree_esc}`);\\\n-         Idiomorph.morph(document.getElementById('detail-pane'), `{detail_esc}`);\\\n-         history.replaceState(null, '', '{url_esc}');\"\n-    );\n-\n-    Response::builder()\n-        .status(StatusCode::OK)\n-        .header(header::CONTENT_TYPE, \"text/javascript; charset=utf-8\")\n-        .body(js)\n-        .unwrap()\n-        .into_response()\n-}\n-\n-#[cfg(test)]\n-mod tests {\n-    use super::*;\n-\n-    use crate::canonical_path::canonicalize_item;\n-    use crate::events::{Event, Ingest};\n-    use crate::reducer::ReducerState;\n-\n-    fn ingest(raw: &str) -> Event {\n-        Event::Ingest(Ingest {\n-            ts: 1,\n-            id: \"test-ingest\".to_string(),\n-            raw: raw.to_string(),\n-            principal: \"tester\".to_string(),\n-            delegate: None,\n-            room_id: \"public\".to_string(),\n-            thread_tag: String::new(),\n-        })\n-    }\n-\n-    fn reduced_with_items(raw: &str) -> ReducerState {\n-        let mut r = ReducerState::default();\n-        r.apply_event(ingest(raw));\n-        r\n-    }\n-\n-    #[test]\n-    fn common_base_boundary_snaps_to_slash_boundary() {\n-        let paths = vec![\n-            \"alphabet/a\".to_string(),\n-            \"alphabet/b\".to_string(),\n-            \"alphabet/c/d\".to_string(),\n-        ];\n-        assert_eq!(common_base_boundary(&paths), \"alphabet/\".to_string());\n-    }\n-\n-    #[test]\n-    fn tree_root_from_path_canonicalizes_ontology_root() {\n-        assert_eq!(tree_root_from_path(None), \"https://slug.social/~/\".to_string());\n-        assert_eq!(\n-            tree_root_from_path(Some(\"alphabet\")),\n-            \"https://slug.social/~/alphabet\".to_string()\n-        );\n-        assert_eq!(\n-            tree_root_from_path(Some(\"/alphabet/\")),\n-            \"https://slug.social/~/alphabet\".to_string()\n-        );\n-    }\n-\n-    #[test]\n-    fn canon_relative_roundtrip_under_root() {\n-        let root = CanonicalItemUrl::parse(\"https://slug.social/~/alphabet\").unwrap();\n-        let item = \"https://slug.social/~/alphabet/a/b\";\n-        let rel = canon_to_relative(&root, item).unwrap();\n-        assert_eq!(rel.0, \"a/b\".to_string());\n-        let back = relative_to_canon(&root, &rel).unwrap();\n-        assert_eq!(back.as_str(), item);\n-    }\n-\n-    #[test]\n-    fn encode_decode_state_blob_v2_roundtrips() {\n-        let root = \"https://slug.social/~/alphabet\";\n-        let mut open: CanonSet = BTreeSet::new();\n-        open.insert(CanonicalItemUrl::parse(\"https://slug.social/~/alphabet/a\").unwrap());\n-        open.insert(CanonicalItemUrl::parse(\"https://slug.social/~/alphabet/b\").unwrap());\n-        let selected = CanonicalItemUrl::parse(\"https://slug.social/~/alphabet/b\").unwrap();\n-\n-        let s = encode_state_blob_v2(root, &open, Some(&selected));\n-        let decoded = decode_state_blob_any(root, &s).expect(\"decode\");\n-        assert_eq!(decoded.open, open);\n-        assert_eq!(decoded.selected.as_ref().map(|c| c.as_str()), Some(selected.as_str()));\n-    }\n-\n-    #[test]\n-    fn baseline_state_blob_decodes() {\n-        let root = \"https://slug.social/~/\";\n-        let s = baseline_state_blob();\n-        let decoded = decode_state_blob_any(root, &s).expect(\"decode baseline\");\n-        assert!(decoded.open.is_empty());\n-        assert!(decoded.selected.is_none());\n-    }\n-\n-    #[test]\n-    fn node_id_is_stable_for_same_path() {\n-        let p = \"https://slug.social/~/alphabet/a\";\n-        assert_eq!(node_id(p), node_id(p));\n-        assert_ne!(node_id(p), node_id(\"https://slug.social/~/alphabet/b\"));\n-    }\n-\n-    #[test]\n-    fn reducer_parent_key_for_tilde_items_is_without_trailing_slash() {\n-        // This is the reducer invariant that the tree view must match.\n-        let item = canonicalize_item(\"~/alphabet/a\");\n-        assert_eq!(crate::canonical_path::item_parent_path(&item).unwrap(), \"https://slug.social/~/alphabet\");\n-        let item2 = canonicalize_item(\"~/a\");\n-        assert_eq!(crate::canonical_path::item_parent_path(&item2).unwrap(), \"https://slug.social/~\");\n-    }\n-\n-    #[test]\n-    fn ranked_children_public_root_lists_children_under_tree_root() {\n-        // Regression test: /tree root uses \"https://slug.social/~/\", but reducer stores\n-        // top-level ontology children under parent \"https://slug.social/~\".\n-        let reduced = reduced_with_items(\n-            r#\"\n-#t\n-~/a\n-~/b\n-\"#,\n-        );\n-\n-        let root = \"https://slug.social/~/\";\n-        let kids = ranked_children_public(&reduced, root);\n-        let kids_s: BTreeSet<String> = kids.into_iter().map(|c| c.as_str().to_string()).collect();\n-\n-        assert!(kids_s.contains(\"https://slug.social/~/a\"));\n-        assert!(kids_s.contains(\"https://slug.social/~/b\"));\n-    }\n-}\n-\n","role":"user"}],"model":"~anthropic/claude-sonnet-latest"}