You are a constitutional council ranking individual git commits for ownership allocation.

Compare these two commits. Decide which contributed more lasting value to the project.

Judge substance, not spectacle:
- Prefer correct, lasting design and real bugfixes over churn, formatting, renames, or generated noise.
- Prefer clarity and necessity over sheer line count. A small precise change can beat a large diffuse one.
- Do not favor a side merely because its patch is longer or noisier.
- Weight what the change does for the project, not the contributor's name.

Return ONLY a JSON object: {"winner": "A" or "B", "ratio": "N:M", "explanation": "..."}
The explanation must cite concrete differences in the patches (1-3 sentences).

Side A — contributor: tommy-mor
Side A — commit message:
[1c914c6e] stage set

Side A — unified diff (full patch):
diff --git a/plan.md b/plan.md
new file mode 100644
index 0000000000000000000000000000000000000000..00d6867a1e0ed144a16a020ea037f685ce646c73
--- /dev/null
+++ b/plan.md
@@ -0,0 +1,155 @@
+# Plan: `ItemId` + `RouteContext` (identity vs hrefs)
+
+This document is for **the next agent** to continue the refactor without re-deriving context from chat. It supersedes ad-hoc notes: treat it as the checklist of record until the work lands and this file is deleted or trimmed.
+
+## Goal
+
+- **Identity** (what lives in the reducer graph, votes, indexes) becomes a **structural `ItemId` enum** in `slug-types`, not a canonical `String` / `CanonicalItemUrl` newtype.
+- **Presentation** (tilde / dash display, breadcrumbs) derives from `ItemId` via explicit methods, not string stripping.
+- **Routing** (browser `href`s for public vs room) goes through **`RouteContext`** (started in `server/src/html/routing.rs`) so Maud/handlers do not stitch `/r/…` vs `/~` ad hoc.
+
+**Non-goals for v1 of the migration:** backward-compatible JSONL or dual-read of old canonical strings in the event log (project has accepted breaking changes). If you reintroduce compat, document it here.
+
+## Current state (as of this plan)
+
+- **`CanonicalItemUrl`** (`types/src/paths.rs`): newtype around `String`; `parse` / `parent` / `display_path` / `tilde_tail` / etc. Reducer `ContentState`, `VoteData`, ranking, RPC, search, garden, breadcrumbs all use it or `String` keys derived from it.
+- **`ThreadNav`** (`server/src/html/forum/nav.rs`): encodes scope prefixes for threads and garden URLs; **`RouteContext`** now wraps `ThreadNav` (`server/src/html/routing.rs`, re-exported from `server/src/html/mod.rs`) but **most HTML still takes `&ThreadNav` directly** — migration incomplete.
+- **URL normalization** lives in `types/src/url_normalize.rs` + `canonicalize_item` / `finalize_external_identity_url` in `paths.rs` (YouTube, sorted query params, room path `room_route_segment` in `paths.rs`).
+- **Room HTTP paths** are `/r/{short}{slug}` (fused segment); wire **`room_id`** remains `short/slug` for RPC/events.
+
+## Target architecture
+
+### `ItemId` (types)
+
+Suggested shape (adjust after profiling `Ord` / `Hash` / serde size):
+
+```text
+ItemId::Root                      — tilde ontology root (today `SLUG_TILDE_ONTOLOGY_ROOT`)
+ItemId::Local { segments }        — slug.social ~/… path as Vec<String> (lowercase segments, non-empty for non-root)
+ItemId::External { url: Url }    — normalized `url::Url` (crate `url` already in `slug-types`)
+```
+
+**API surface (minimum):**
+
+- `ItemId::parse(&str) -> Option<ItemId>` — single entry from DSL / user input / legacy wire (internally may call `canonicalize_item` + structured split).
+- `ItemId::to_wire_url(&self) -> String` — only for **external** boundaries if needed (HTTP fetch, rare assertions); avoid using as the primary key once maps use `ItemId`.
+- `parent`, `display_path`, `tilde_tail` / `tilde_http_tail`, `tilde_segments`, `last_segment`, `normalized_storage` — port from `CanonicalItemUrl`.
+- **`Ord` + `Hash` + `Eq`** stable for `BTreeSet` / `HashMap` (see `write_actor` scope-rank snapshots).
+- **`Serialize` / `Deserialize`** — decide **tagged JSON** for any persisted or API-carried structs (e.g. `VoteData` in tests). If RPC must stay stringy for clients, use a **DTO layer** that converts `ItemId` ↔ wire at the boundary only.
+
+**Remove:** `CanonicalItemUrl` type and all `path_types::CanonicalItemUrl` / `slug_types::paths::CanonicalItemUrl` exports once call sites are migrated. **`Borrow<str>`** on the old newtype goes away; update `nav!` / any code that assumed map keys borrowed as `str`.
+
+### `RouteContext` (server HTML)
+
+- **File:** `server/src/html/routing.rs` — **`RouteContext(ThreadNav)`** with `item_href`, `item_href_raw`, `thread_url`, `garden_root_url`, `room_url`, `From`/`Into` `ThreadNav`.
+- **Direction:** new code and refactored Maud should take **`&RouteContext`** (or owned where appropriate) instead of `&ThreadNav` when building links. Long term, **`item_href(&ItemId)`** should not parse strings — it should pattern-match `ItemId` and append tilde tail or `/-/…` external tail using the same rules as today’s `ThreadNav::garden_item_url`.
+
+### Axum / garden routes
+
+- **No** single catch-all route (explicit decision): keep the existing router layout in `server/src/lib.rs`.
+- Room routes stay **`/r/:room_key/...`** with `room_key` fused; parsing via `slug_types::room_id_from_route_segment` / `room_route_segment` in `paths.rs`.
+
+## Phased execution (recommended order)
+
+### Phase 0 — Preconditions (quick)
+
+1. Read **`AGENTS.md`** (UI contract, durability matrix, `RpcCommand` vs `HtmlUiAction`).
+2. Run **`cargo test --workspace`** and **`./scripts/clj-test.sh`** on clean `main` before large diffs; repeat after each phase.
+
+### Phase 1 — `ItemId` in `slug-types` (no server yet)
+
+1. Add **`ItemId`** (new file e.g. `types/src/item_id.rs` **or** inline at bottom of `paths.rs` — see **Module cycle** below).
+2. Implement **`ItemId::parse`** using existing **`canonicalize_item`** + normalization; port **`CanonicalItemUrl`** methods to **`ItemId`** with tests ported from `paths.rs` `#[cfg(test)] mod tests`.
+3. **`GardenItemUrl::from_stored(&ItemId, room_wire)`** (and thread helpers) — build absolute hrefs from structure, not from re-parsing a canonical string.
+4. **`TildeHttpPathTail::to_item_id`** (rename from `to_canonical`) / **`tilde_http_path_to_item_id`**.
+5. **`TildeOntologyPath::from_stored(&ItemId)`**.
+6. Export **`ItemId`** from **`types/src/lib.rs`**; update **`server/src/path_types.rs`** re-exports.
+7. **Delete `CanonicalItemUrl`** and fix all **in-crate** references in `types` only until `cargo test` passes for `slug-types`.
+
+**Module cycle trap:** `item_id.rs` must not `use crate::paths::{...}` if `paths.rs` also imports `ItemId` for `GardenItemUrl` in the same module. **Fix one of:**
+
+- **A)** Put `ItemId` **inside `paths.rs`** below `canonicalize_item` / helpers (simplest, large file), or  
+- **B)** Split **`canonicalize_item`** (+ dash host helpers + `finalize_external_identity_url`) into **`types/src/item_wire.rs`**, then `paths.rs` + `item_id.rs` both depend on `item_wire` only (cleaner, more files).
+
+### Phase 2 — Reducer + ranking (server core)
+
+1. **`server/src/reducer.rs`**: `ContentState` / `GroupState` / **`VoteData`** — replace **`CanonicalItemUrl`** with **`ItemId`** on all maps, sets, deques, vectors.
+2. **`apply_vote`**: normalize `a`/`b` via **`ItemId::parse`** or **`ItemId`**-aware logic (remove string round-trip).
+3. **`apply_ingest_to_content`**: **`dsl`** still yields strings for item titles in statements; normalize to **`ItemId`** at ingest boundary via **`ItemId::parse`** once per item.
+4. **`server/src/ranking.rs`**, **`server/src/scope_rank.rs`**, **`server/src/api/write_actor.rs`** (including **`BTreeSet`** ordering), **`server/src/api/validate.rs`**, **`server/src/api/helpers.rs`** — propagate **`ItemId`**.
+5. **`server/tests/basic.rs`** and any reducer tests constructing **`VoteData`** — use **`ItemId::parse(...).unwrap()`** or helpers.
+
+### Phase 3 — RPC + search + external resolver
+
+1. **`server/src/api/rpc.rs`**: rank/pair/matchup/search payloads; today many paths use **`GardenItemUrl::from_storage_str(item.as_str(), …)`** — switch to **`ItemId`** + **`GardenItemUrl::from_stored(&item_id, …)`** (or equivalent).
+2. **`server/src/html/search.rs`**: scoring uses item path strings — derive from **`ItemId::display_path`** / **`to_wire_url`** only at the scoring boundary if needed.
+3. **`server/src/external_resolver.rs`**: take **`&ItemId`** or **`ItemId::external_url()`** instead of **`&CanonicalItemUrl`**.
+
+### Phase 4 — HTML / Maud
+
+1. **`ThreadNav::garden_item_url`**: overload or replace with **`garden_item_href(&self, item: &ItemId)`** (no `CanonicalItemUrl::parse` inside).
+2. **`RouteContext`**: extend **`item_href(&ItemId)`**; migrate call sites from **`ThreadNav`** to **`RouteContext`** where only link-building is needed (keep **`ThreadNav`** where scope / auth helpers need the full struct).
+3. **`server/src/html/garden.rs`**, **`breadcrumb_path.rs`**, **`forum/*`**, **`editor.rs`**: replace **`CanonicalItemUrl`** with **`ItemId`**; breadcrumbs should walk **`ItemId::parent`** without string `rsplit`.
+4. **`types` JSON types** (`RankRow`, etc.): decide whether **`GardenItemUrl`** stays string for JSON or becomes a structured field; keep **one** wire format for the public API.
+
+### Phase 5 — Cleanup + docs
+
+1. Remove dead **`canonical_path`** / **`breadcrumb_path`** string logic if fully superseded.
+2. Update **`AGENTS.md`** if durability, `POST /ui`, or command surfaces change.
+3. Delete or shrink **`plan.md`** when done.
+
+## File / symbol checklist (non-exhaustive — grep-driven)
+
+Run periodically:
+
+```bash
+rg "CanonicalItemUrl" -g'*.rs'
+rg "path_types::CanonicalItemUrl" -g'*.rs'
+rg "tilde_http_path_to_canonical" -g'*.rs'
+```
+
+**High-touch files (from prior exploration):**
+
+| Area | Files |
+|------|--------|
+| Types | `types/src/paths.rs`, `types/src/lib.rs`, `types/src/url_normalize.rs`, (optional) `types/src/item_id.rs`, `types/src/item_wire.rs` |
+| Server re-exports | `server/src/path_types.rs`, `server/src/canonical_path.rs` |
+| Reducer / ingest | `server/src/reducer.rs`, `server/src/dsl.rs` (parse output types if changed) |
+| Ranking | `server/src/ranking.rs`, `server/src/scope_rank.rs` |
+| Writer / RPC | `server/src/api/write_actor.rs`, `server/src/api/rpc.rs`, `server/src/api/helpers.rs`, `server/src/api/validate.rs` |
+| HTML | `server/src/html/garden.rs`, `server/src/html/breadcrumb_path.rs`, `server/src/html/forum/nav.rs`, `server/src/html/routing.rs`, `server/src/html/search.rs`, `server/src/html/editor.rs`, `server/src/html/forum/ingest.rs`, … |
+| Tests | `server/tests/basic.rs`, `server/tests/integration.rs`, `types/src/paths.rs` tests, Clojure under `test/` if URLs/assertions mention canonical shapes |
+
+## Events / JSONL
+
+- **`Ingest`** events store **`raw` DSL** only — no change required for item identity inside the event.
+- If any future event type stores item ids as strings, migrate to **structured `ItemId` serde** or accept string only at the event boundary with immediate parse into **`ItemId`** on `apply_event`.
+
+## `nav!` macro (`server/src/paths.rs`)
+
+- Macros use **`keypath($key)`** with **`.clone()`** — **`ItemId`** must be **`Clone`** (already for enums). Remove any reliance on **`Borrow<str>`** for map keys.
+
+## Testing gate
+
+After each phase:
+
+```bash
+cargo test --workspace
+./scripts/clj-test.sh
+```
+
+## Risks / gotchas
+
+1. **`Ord` on `ItemId`**: must match prior **`CanonicalItemUrl`** / `String` ordering wherever **`BTreeSet`** is used (e.g. deterministic scope-rank snapshots in **`write_actor`**).
+2. **External `ItemId`**: **`Url`** equality / hashing — normalization is already centralized in **`url_normalize`**; ensure **`ItemId::parse`** always inserts normalized **`Url`** into **`External`**.
+3. **Fake parent URLs** in garden (e.g. **`https://.`** for external root ranking): find all **`parse("https://.")`** style hacks and express as **`ItemId`** or a dedicated sentinel.
+4. **Serde**: tests and any RPC clients that snapshot JSON may need expectation updates if **`VoteData`** shape changes.
+
+## Optional follow-ups (not blocking `ItemId`)
+
+- More **domain normalizers** in **`url_normalize.rs`** (e.g. `music.youtube.com`, Spotify, etc.).
+- **Room wire** vs **HTTP segment** helpers already in **`paths.rs`** (`ROOM_SHORT_ID_LEN`, `room_route_segment`, `room_id_from_route_segment`).
+
+---
+
+**End state criteria:** `rg CanonicalItemUrl` returns nothing; reducer maps use **`ItemId`**; HTML link generation for items goes through **`RouteContext` + `ItemId`**; tests and Kaocha green.
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index c3dccd03dc6da2a2f6f6fa828657e33a951884b1..668403a35c415e6f091362b28c63ac294057fb6d 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -15,6 +15,7 @@ mod breadcrumb_path;
 mod editor;
 mod forum;
 mod garden;
+pub mod routing;
 mod search;
 pub mod ui_action;
 use breadcrumb_path::{ExternalOntologyPath, OntologyPath};
@@ -35,6 +36,7 @@ pub use garden::{
     external_garden_index, external_ontology_path, garden_index, ontology_path, room_external_garden_index,
     room_external_ontology_path, room_garden_index, room_ontology_path,
 };
+pub use routing::RouteContext;
 pub use search::{search_page, search_results_fragment};
 pub use forum::user_profile_page;
 pub use ui_action::{parse_html_ui_from_form, HtmlUiAction, HtmlUiParseError, UI_RPC_FIELD};
diff --git a/server/src/html/routing.rs b/server/src/html/routing.rs
new file mode 100644
index 0000000000000000000000000000000000000000..13e9ae0cbe32d454e34a7737edf8234d2a558502
--- /dev/null
+++ b/server/src/html/routing.rs
@@ -0,0 +1,71 @@
+//! Scoped browser paths for HTML. **RouteContext** is the intended single place to build `href`s
+//! given public vs room scope (the original blueprint name); today it wraps [`ThreadNav`].
+//!
+//! Prefer `RouteContext::item_href` / [`RouteContext::thread_url`] in new Maud over stitching
+//! `/r/…` vs `/~` manually. Call sites can migrate incrementally from passing `&ThreadNav`.
+
+use crate::path_types::CanonicalItemUrl;
+
+use super::forum::ThreadNav;
+
+#[derive(Clone)]
+pub struct RouteContext(ThreadNav);
+
+impl RouteContext {
+    #[inline]
+    pub fn public() -> Self {
+        Self(ThreadNav::public())
+    }
+
+    #[inline]
+    pub fn from_room_id(room_id: &str) -> Option<Self> {
+        ThreadNav::from_room_id(room_id).map(Self)
+    }
+
+    #[inline]
+    pub fn thread_nav(&self) -> &ThreadNav {
+        &self.0
+    }
+
+    #[inline]
+    pub fn into_thread_nav(self) -> ThreadNav {
+        self.0
+    }
+
+    /// Relative path for a stored canonical item in this scope’s garden.
+    pub fn item_href(&self, item: &CanonicalItemUrl) -> String {
+        self.0.garden_item_url(item.as_str())
+    }
+
+    /// Same as [`Self::item_href`] but parses `item` first (raw DSL / user paste).
+    pub fn item_href_raw(&self, item: &str) -> String {
+        self.0.garden_item_url(item)
+    }
+
+    #[inline]
+    pub fn thread_url(&self, tag: &str) -> String {
+        self.0.thread_url(tag)
+    }
+
+    #[inline]
+    pub fn garden_root_url(&self) -> &str {
+        self.0.garden_root_url()
+    }
+
+    #[inline]
+    pub fn room_url(&self) -> &str {
+        self.0.room_url()
+    }
+}
+
+impl From<ThreadNav> for RouteContext {
+    fn from(nav: ThreadNav) -> Self {
+        Self(nav)
+    }
+}
+
+impl From<RouteContext> for ThreadNav {
+    fn from(ctx: RouteContext) -> Self {
+        ctx.0
+    }
+}


Side B — contributor: tommy-mor
Side B — commit message:
[7287df45] Add browser test for pool-scoped vote sequence.

Seeds ~/pool/a-j (10 letters), enters /vote?pool=~/pool, then follows
the vote → next-pair loop up to 15 iterations. Asserts each vote lands
in edge history and each pair shown belongs to the pool.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Side B — unified diff (full patch):
diff --git a/test/browser_vote_pool.clj b/test/browser_vote_pool.clj
new file mode 100644
index 0000000000000000000000000000000000000000..d51f05db47dc3cb013e56e65f3a1edfbbcbd96ab
--- /dev/null
+++ b/test/browser_vote_pool.clj
@@ -0,0 +1,137 @@
+(ns test.browser-vote-pool
+  "Pool-scoped voting: seed ~/pool/a-j, enter via /vote?pool=~/pool, follow
+   the vote → next-pair → vote sequence until no next pair or 15 iterations."
+  (:require [babashka.fs :as fs]
+            [cheshire.core :as json]
+            [clojure.string :as str]
+            [clojure.test :refer [deftest is]]
+            [com.blockether.spel.core :as core]
+            [com.blockether.spel.locator :as locator]
+            [com.blockether.spel.page :as page]
+            [test.common :as common]
+            [test.oauth :as oauth]))
+
+(defn- wait-for-text [pg selector expected timeout-ms]
+  (let [deadline (+ (System/currentTimeMillis) timeout-ms)]
+    (loop []
+      (let [text (locator/text-content (page/locator pg selector))]
+        (if (and (string? text) (str/includes? text expected))
+          true
+          (if (< (System/currentTimeMillis) deadline)
+            (do (Thread/sleep 200) (recur))
+            false))))))
+
+(defn- element-text [pg selector]
+  (try (locator/text-content (page/locator pg selector)) (catch Exception _ nil)))
+
+(defn- enc [^String s]
+  (java.net.URLEncoder/encode s "UTF-8"))
+
+(def letters ["a" "b" "c" "d" "e" "f" "g" "h" "i" "j"])
+
+(defn vote-pool-flow! []
+  (println "\n━━━ browser vote pool (/vote?pool= seeds + follow next-pair sequence) ━━━\n")
+
+  (common/letlocals
+   (bind build (common/run-cargo-build-release! ["slugsocial-server"]))
+   (is (zero? (:exit build)) "cargo build succeeds")
+   (bind server-bin "target/release/slugsocial-server")
+
+   (bind tmp-dir (str (fs/create-temp-dir {:prefix "slug-browser-vote-pool-"})))
+   (bind slug-port (common/pick-port))
+   (bind google-port (common/pick-port))
+   (bind base-url (str "http://127.0.0.1:" slug-port))
+   (bind google-url (str "http://127.0.0.1:" google-port))
+
+   (bind !server (atom nil))
+   (bind !google (atom nil))
+   (bind server-env (common/slug-server-env tmp-dir base-url google-url slug-port))
+   (try
+     (reset! !google (oauth/start-mock-google google-port
+                                              :google-users ["google-user-alice"]))
+     (reset! !server (common/start-server server-bin server-env))
+     (is (common/wait-for-server base-url 10000) "server responds to /healthz")
+
+     (let [alice-token (oauth/fetch-bearer-token! base-url :username "alice")
+           thread-tag  "browser-vote-pool"
+           ;; seed ~/pool/a through ~/pool/j as items with bodies
+           item-lines  (str/join "\n"
+                                 (map (fn [l] (str "~/pool/" l " {" l "}")) letters))
+           raw         (str "# " thread-tag "\n\n~/pool {root}\n" item-lines "\n")
+           post-resp   (oauth/http-post-json
+                        (str base-url "/api/v0/rpc")
+                        [{"Post" {"room"             "public"
+                                  "thread_tag"       thread-tag
+                                  "text"             raw
+                                  "return_rank_diff" false}}]
+                        :headers {"Authorization" (str "Bearer " alice-token)})
+           post-json   (json/parse-string (:body post-resp) false)
+           _           (is (true? (get-in post-json ["results" 0 "ok"]))
+                           "seed ~/pool/a-j items via rpc")
+           pool-url    (str base-url "/vote?pool=" (enc "~/pool"))]
+
+       (core/with-playwright [pw]
+         (core/with-browser [browser (core/launch-chromium pw {:headless true :channel "chrome"})]
+           (core/with-context [ctx (core/new-context browser)]
+             (core/with-page [pg (core/new-page-from-context ctx)]
+               (page/navigate pg (str base-url "/login"))
+               (is (wait-for-text pg "body" "@alice" 15000) "alice session after login")
+
+               ;; Enter via pool URL — page picks first pair automatically.
+               (page/navigate pg pool-url)
+               (is (wait-for-text pg "body.view-vote-compare" "compare" 15000)
+                   "pool entry: vote compare page loads")
+
+               ;; Verify the initial pair is within the pool.
+               (let [pair-text (element-text pg ".vote-compare-pair")]
+                 (is (and (string? pair-text) (str/includes? pair-text "~/pool/"))
+                     (str "initial pair is within ~/pool: " pair-text)))
+
+               ;; Follow vote → next-pair sequence up to 15 iterations.
+               (let [votes-cast
+                     (loop [i 0]
+                       (if (>= i 15)
+                         i
+                         (let [explanation (str "pool vote " i " reason")]
+                           (locator/fill (page/locator pg "#vote-explain") explanation)
+                           (locator/click (page/locator pg "#vote-compare-form button[type=submit]"))
+                           ;; Wait for edge history morph confirming the vote landed.
+                           (if-not (wait-for-text pg "ul.vote-edge-history" explanation 20000)
+                             (do (println "  vote" i "history morph timed out — stopping")
+                                 i)
+                             (let [has-next (wait-for-text pg "[data-testid=\"vote-next-pair\"]"
+                                                           "next pair" 8000)]
+                               (if-not has-next
+                                 ;; "no next pair" — pool exhausted.
+                                 (do (println "  no next pair after vote" i " — pool exhausted")
+                                     (inc i))
+                                 (do
+                                   ;; Verify the pair on this page is within the pool before advancing.
+                                   (let [pt (element-text pg ".vote-compare-pair")]
+                                     (is (and (string? pt) (str/includes? pt "~/pool/"))
+                                         (str "pair at vote " i " is within ~/pool: " pt)))
+                                   (locator/click (page/locator pg "[data-testid=\"vote-next-pair\"]"))
+                                   ;; Wait for next pair to load.
+                                   (wait-for-text pg "body.view-vote-compare" "compare" 10000)
+                                   (recur (inc i)))))))))]
+
+                 (is (>= votes-cast 1) (str "cast at least 1 vote, got: " votes-cast))
+                 (println (str "  pool voting sequence complete: " votes-cast " vote(s) cast")))
+
+               ;; After the sequence, the current page is still a pool-scoped vote page.
+               (let [url (page/url pg)]
+                 (is (str/includes? (or url "") "/vote")
+                     (str "still on /vote after sequence: " url))))))))
+
+     (finally
+       (when-some [s @!server] (common/kill-server s))
+       (when-some [g @!google] ((:stop-fn g)))
+       (fs/delete-tree tmp-dir)))
+
+   nil))
+
+(defn vote-pool-browser-test [& _args]
+  (vote-pool-flow!))
+
+(deftest browser-vote-pool-sequence
+  (vote-pool-flow!))