{"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[8d5328d3] -theme\n\nSide A — unified diff (full patch):\ndiff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs\nindex 82b2aa51d21ada1d0d849d3ddfc3a81e4241d861..e74e42e0f0ffc4224f5ef5421b486a5f35434999 100644\n--- a/server/src/api/ui_html.rs\n+++ b/server/src/api/ui_html.rs\n@@ -73,11 +73,7 @@ pub async fn post_ui_html(\n                     ensure_partial_tree(&mut tree, &item);\n                 }\n                 let _ = state.ensure_node(&item).await;\n-                let dest = if item.is_root() {\n-                    \"/\".to_string()\n-                } else {\n-                    format!(\"/?item={}\", item.as_str())\n-                };\n+                let dest = item.browse_href();\n                 JsBuilder::new()\n                     .raw(&format!(\n                         \"window.location.href={};\",\ndiff --git a/server/src/html/mod.rs b/server/src/html/mod.rs\nindex c973cb718ac74b95570dabea76e24459417790b9..a8353c6de0cd6d268219e552b7ca1ba4e3000585 100644\n--- a/server/src/html/mod.rs\n+++ b/server/src/html/mod.rs\n@@ -1,13 +1,10 @@\n use axum::{\n     body::Body,\n     extract::{Path, State},\n-    http::{header, HeaderValue, StatusCode, Uri},\n+    http::{header, StatusCode, Uri},\n     response::{IntoResponse, Response},\n-    Form,\n };\n-use axum_extra::extract::cookie::CookieJar;\n use maud::{html, Markup, DOCTYPE};\n-use serde::Deserialize;\n \n use crate::{\n     form_template::template_json_compact,\n@@ -15,96 +12,25 @@ use crate::{\n     path_types::ItemId,\n     ranking::{top_bottom, RankedItem},\n     reducer::{GroupState, NodeState},\n-    state::{parse_item_param, AppState},\n+    state::AppState,\n     ui_action::UI_RPC_FIELD,\n };\n \n-const THEME_DEFAULT_CSS: &str = include_str!(\"../../static/theme_default.css\");\n-const THEME_RETRO_CSS: &str = include_str!(\"../../static/theme_retro.css\");\n+const SORTER_CSS: &str = include_str!(\"../../static/sorter.css\");\n const SORTER_UI_JS: &str = include_str!(\"../../static/sorter_ui.js\");\n \n-pub const SORTER_THEME_COOKIE: &str = \"sorter-theme\";\n-\n-pub fn normalize_theme(raw: &str) -> &'static str {\n-    match raw {\n-        \"retro\" => \"retro\",\n-        _ => \"default\",\n-    }\n-}\n-\n-pub fn theme_from_jar(jar: &CookieJar) -> &'static str {\n-    jar.get(SORTER_THEME_COOKIE)\n-        .map(|c| normalize_theme(c.value()))\n-        .unwrap_or(\"default\")\n-}\n-\n-pub fn theme_next_from_uri(uri: &Uri) -> String {\n-    uri.path_and_query()\n-        .map(|pq| pq.as_str().to_string())\n-        .filter(|s| !s.is_empty())\n-        .unwrap_or_else(|| \"/\".to_string())\n-}\n-\n-pub fn theme_cookie_header_value(theme: &str) -> HeaderValue {\n-    let t = normalize_theme(theme);\n-    let s = format!(\"{SORTER_THEME_COOKIE}={t}; Path=/; SameSite=Lax; Max-Age=31536000\");\n-    HeaderValue::from_str(&s).expect(\"theme cookie must be ASCII\")\n-}\n-\n-fn sanitize_theme_next(next: Option<&str>) -> String {\n-    let s = next.unwrap_or(\"/\").trim();\n-    if s.starts_with('/') && !s.starts_with(\"//\") && s.len() < 8192 {\n-        s.to_string()\n-    } else {\n-        \"/\".to_string()\n-    }\n-}\n-\n-#[derive(Debug, Deserialize)]\n-pub struct ThemeForm {\n-    theme: String,\n-    next: Option<String>,\n-}\n-\n-pub async fn post_theme(Form(form): Form<ThemeForm>) -> impl IntoResponse {\n-    let theme = normalize_theme(&form.theme);\n-    let next = sanitize_theme_next(form.next.as_deref());\n-    let loc =\n-        HeaderValue::try_from(next.as_str()).unwrap_or_else(|_| HeaderValue::from_static(\"/\"));\n-    Response::builder()\n-        .status(StatusCode::SEE_OTHER)\n-        .header(header::LOCATION, loc)\n-        .header(header::SET_COOKIE, theme_cookie_header_value(theme))\n-        .body(Body::empty())\n-        .expect(\"theme redirect response\")\n-}\n-\n pub async fn serve_static(Path(filename): Path<String>) -> impl IntoResponse {\n-    if filename == \"sorter_ui.js\" {\n-        return Response::builder()\n-            .status(StatusCode::OK)\n-            .header(header::CONTENT_TYPE, \"text/javascript; charset=utf-8\")\n-            .header(header::CACHE_CONTROL, \"public, max-age=3600\")\n-            .body(SORTER_UI_JS.to_string())\n-            .unwrap()\n-            .into_response();\n-    }\n-\n-    let theme = filename\n-        .strip_prefix(\"theme_\")\n-        .and_then(|s| s.strip_suffix(\".css\"));\n-\n-    let css = match theme {\n-        Some(\"default\") => THEME_DEFAULT_CSS,\n-        Some(\"retro\") => THEME_RETRO_CSS,\n+    let (content_type, body) = match filename.as_str() {\n+        \"sorter.css\" => (\"text/css; charset=utf-8\", SORTER_CSS),\n+        \"sorter_ui.js\" => (\"text/javascript; charset=utf-8\", SORTER_UI_JS),\n         _ => return (StatusCode::NOT_FOUND, \"static file not found\").into_response(),\n     };\n \n     Response::builder()\n         .status(StatusCode::OK)\n-        .header(header::CONTENT_TYPE, \"text/css; charset=utf-8\")\n+        .header(header::CONTENT_TYPE, content_type)\n         .header(header::CACHE_CONTROL, \"public, max-age=3600\")\n-        .body(css.to_string())\n+        .body(body.to_string())\n         .unwrap()\n         .into_response()\n }\n@@ -162,8 +88,7 @@ fn asset_version() -> &'static str {\n     V.get_or_init(|| {\n         use std::hash::{Hash, Hasher};\n         let mut h = std::collections::hash_map::DefaultHasher::new();\n-        THEME_DEFAULT_CSS.hash(&mut h);\n-        THEME_RETRO_CSS.hash(&mut h);\n+        SORTER_CSS.hash(&mut h);\n         SORTER_UI_JS.hash(&mut h);\n         format!(\"{:x}\", h.finish())\n     })\n@@ -176,9 +101,9 @@ pub fn now_ms() -> i64 {\n     t.as_millis() as i64\n }\n \n-fn layout(title: &str, body: Markup, views: u64, theme: &str, theme_next: &str) -> Markup {\n+fn layout(title: &str, body: Markup, views: u64) -> Markup {\n     let ver = asset_version();\n-    let css_href = format!(\"/static/theme_{theme}.css?v={ver}\");\n+    let css_href = format!(\"/static/sorter.css?v={ver}\");\n     let js_src = format!(\"/static/sorter_ui.js?v={ver}\");\n     html! {\n         (DOCTYPE)\n@@ -187,7 +112,7 @@ fn layout(title: &str, body: Markup, views: u64, theme: &str, theme_next: &str)\n                 meta charset=\"utf-8\";\n                 meta name=\"viewport\" content=\"width=device-width, initial-scale=1\";\n                 title { (title) }\n-                link rel=\"stylesheet\" href=(css_href) id=\"theme-stylesheet\";\n+                link rel=\"stylesheet\" href=(css_href);\n                 script src=\"https://unpkg.com/idiomorph@0.3.0/dist/idiomorph.min.js\" {}\n             }\n             body class=\"home\" {\n@@ -196,21 +121,6 @@ fn layout(title: &str, body: Markup, views: u64, theme: &str, theme_next: &str)\n                 }\n                 div id=\"errors\" {}\n                 (body)\n-                div id=\"controls\" {\n-                    a href=\"https://github.com/sortersocial/sorter2\" id=\"src-link\" { \"src\" }\n-                    form id=\"sorter-theme-form\" method=\"post\" action=\"/theme\" data-navigate=\"full\" {\n-                        input type=\"hidden\" name=\"next\" value=(theme_next);\n-                        select id=\"theme-select\" name=\"theme\" onchange=\"this.form.submit()\" aria-label=\"Theme\" {\n-                            @for (val, label) in [(\"default\", \"default\"), (\"retro\", \"retro\")] {\n-                                @if theme == val {\n-                                    option value=(val) selected { (label) }\n-                                } @else {\n-                                    option value=(val) { (label) }\n-                                }\n-                            }\n-                        }\n-                    }\n-                }\n                 script src=(js_src) {}\n             }\n         }\n@@ -218,11 +128,7 @@ fn layout(title: &str, body: Markup, views: u64, theme: &str, theme_next: &str)\n }\n \n fn item_href(id: &ItemId) -> String {\n-    if id.is_root() {\n-        \"/\".to_string()\n-    } else {\n-        format!(\"/?item={}\", id.as_str())\n-    }\n+    id.browse_href()\n }\n \n fn segment_label(seg: &str) -> &str {\n@@ -361,39 +267,10 @@ pub fn vote_panel(parent: &ItemId) -> Markup {\n }\n \n \n-fn query_param(uri: &Uri, key: &str) -> Option<String> {\n-    let q = uri.query()?;\n-    q.split('&').find_map(|pair| {\n-        let mut it = pair.splitn(2, '=');\n-        if it.next()? == key {\n-            Some(it.next().unwrap_or(\"\").to_string())\n-        } else {\n-            None\n-        }\n-    })\n-}\n-\n-pub async fn home(\n-    State(state): State<AppState>,\n-    jar: CookieJar,\n-    uri: Uri,\n-) -> impl IntoResponse {\n+async fn item_page(state: AppState, uri: Uri, item: ItemId) -> Markup {\n     let path = uri.path().to_string();\n     state.views.increment(path.clone());\n     let views = state.views.get_views(&path);\n-    let theme = theme_from_jar(&jar);\n-    let theme_next = theme_next_from_uri(&uri);\n-\n-    let item_raw = query_param(&uri, \"item\")\n-        .or_else(|| query_param(&uri, \"sub\").map(|sub| {\n-            if sub.is_empty() {\n-                String::new()\n-            } else {\n-                format!(\"reddit.com/r/{sub}\")\n-            }\n-        }))\n-        .unwrap_or_default();\n-    let item = parse_item_param(&item_raw);\n \n     let tree = state.tree.read().await;\n     let empty_node = NodeState::default();\n@@ -408,5 +285,14 @@ pub async fn home(\n         (vote_panel(&item))\n         (ranking_panel(&item, group))\n     };\n-    layout(\"sorter2\", body, views, theme, &theme_next)\n+    layout(\"sorter2\", body, views)\n+}\n+\n+pub async fn home(State(state): State<AppState>, uri: Uri) -> impl IntoResponse {\n+    item_page(state, uri, ItemId::root()).await\n+}\n+\n+pub async fn browse(State(state): State<AppState>, uri: Uri) -> impl IntoResponse {\n+    let item = ItemId::from_browse_uri(uri.path()).unwrap_or(ItemId::root());\n+    item_page(state, uri, item).await\n }\ndiff --git a/server/src/lib.rs b/server/src/lib.rs\nindex 14e7cfbc38feb5d07aff859b64bce6e2ec45cf91..cd56743192919cf4dcea539b3d8873a21fb7e72b 100644\n--- a/server/src/lib.rs\n+++ b/server/src/lib.rs\n@@ -30,9 +30,9 @@ pub fn create_app(state: AppState) -> Router {\n     Router::new()\n         .route(\"/healthz\", get(|| async { \"ok\" }))\n         .route(\"/static/:filename\", get(crate::html::serve_static))\n+        .route(\"/~/*item_path\", get(crate::html::browse))\n         .route(\"/\", get(crate::html::home))\n         .route(\"/ui\", post(crate::api::ui_html::post_ui_html))\n-        .route(\"/theme\", post(crate::html::post_theme))\n         .with_state(state)\n         .layer(TraceLayer::new_for_http())\n }\ndiff --git a/server/src/path_types.rs b/server/src/path_types.rs\nindex b5c41444f7bcd4d8d289ed3af464bc3f14d0df99..12dce9888f5cd4e1a0974d12d6468368d0f775b9 100644\n--- a/server/src/path_types.rs\n+++ b/server/src/path_types.rs\n@@ -90,6 +90,50 @@ impl ItemId {\n         paths\n     }\n \n+    /// Full URL for the browser location bar after `/~/`.\n+    pub fn to_browse_url(&self) -> String {\n+        if self.is_root() {\n+            return String::new();\n+        }\n+        if self.as_str().contains(\"://\") {\n+            return self.as_str().to_string();\n+        }\n+        if self\n+            .segments()\n+            .first()\n+            .is_some_and(|s| s.contains('.'))\n+        {\n+            format!(\"https://{}\", self.as_str())\n+        } else {\n+            self.as_str().to_string()\n+        }\n+    }\n+\n+    /// App route, e.g. `/~/https://reddit.com/r/rust`.\n+    pub fn browse_href(&self) -> String {\n+        if self.is_root() {\n+            \"/\".to_string()\n+        } else {\n+            format!(\"/~/{}\", self.to_browse_url())\n+        }\n+    }\n+\n+    /// Parse the tail after `/~/` in a request path.\n+    pub fn from_browse_tail(tail: &str) -> ItemId {\n+        let raw = normalize_browse_tail(tail);\n+        if raw.is_empty() {\n+            return ItemId::root();\n+        }\n+        ItemId::from_url(&raw)\n+            .or_else(|| ItemId::parse(&raw))\n+            .unwrap_or_else(|| ItemId::opaque(raw))\n+    }\n+\n+    pub fn from_browse_uri(path: &str) -> Option<ItemId> {\n+        path.strip_prefix(\"/~/\")\n+            .map(ItemId::from_browse_tail)\n+    }\n+\n     fn canonicalize(raw: &str) -> Option<String> {\n         let s = raw.trim();\n         if s.is_empty() {\n@@ -155,6 +199,21 @@ fn normalize_host(host: &str) -> String {\n     }\n }\n \n+fn normalize_browse_tail(tail: &str) -> String {\n+    let t = tail.trim();\n+    if t.is_empty() {\n+        return String::new();\n+    }\n+    // Some HTTP stacks collapse `https://` → `https:/` inside a path segment.\n+    if t.starts_with(\"https:/\") && !t.starts_with(\"https://\") {\n+        return format!(\"https://{}\", &t[7..]);\n+    }\n+    if t.starts_with(\"http:/\") && !t.starts_with(\"http://\") {\n+        return format!(\"http://{}\", &t[6..]);\n+    }\n+    t.to_string()\n+}\n+\n fn normalize_reddit_host_path(s: &str) -> String {\n     let (host, path) = s.split_once('/').unwrap_or((s, \"\"));\n     let host = normalize_host(host);\n@@ -252,4 +311,22 @@ mod tests {\n         );\n         assert!(ItemId::from_legacy_scope(\"\").is_root());\n     }\n+\n+    #[test]\n+    fn browse_href_wraps_canonical_path() {\n+        let id = ItemId::parse(\"reddit.com/r/rust\").unwrap();\n+        assert_eq!(id.browse_href(), \"/~/https://reddit.com/r/rust\");\n+    }\n+\n+    #[test]\n+    fn from_browse_tail_parses_full_url() {\n+        let id = ItemId::from_browse_tail(\"https://reddit.com/r/AmITheAsshole\");\n+        assert_eq!(id.as_str(), \"reddit.com/r/amitheasshole\");\n+    }\n+\n+    #[test]\n+    fn from_browse_uri_strips_prefix() {\n+        let id = ItemId::from_browse_uri(\"/~/https://reddit.com/r/rust\").unwrap();\n+        assert_eq!(id.as_str(), \"reddit.com/r/rust\");\n+    }\n }\ndiff --git a/server/static/sorter_ui.js b/server/static/sorter_ui.js\nindex 9c475d8e076ba527aaf7a25c177d0d651bd46ca9..d9b016f197547f37ca4b2bcdd7ee6b673d0fb3f0 100644\n--- a/server/static/sorter_ui.js\n+++ b/server/static/sorter_ui.js\n@@ -24,7 +24,6 @@\n       var f = e.target;\n       if (!f || f.tagName !== 'FORM') return;\n       if ((f.method || 'get').toLowerCase() !== 'post') return;\n-      if (f.id === 'sorter-theme-form') return;\n       if (f.getAttribute('data-navigate') === 'full') return;\n       e.preventDefault();\n       await postUiForm(f);\ndiff --git a/server/static/theme_default.css b/server/static/theme_default.css\ndeleted file mode 100644\nindex 1bf8ac7a25207336c019f93cd4119bd0e06229f0..0000000000000000000000000000000000000000\n--- a/server/static/theme_default.css\n+++ /dev/null\n@@ -1,186 +0,0 @@\n-:root {\n-  --bg: #0f1115;\n-  --fg: #e8eaed;\n-  --muted: #9aa0a6;\n-  --accent: #7cacf8;\n-  --panel: #1a1d24;\n-  --border: #2a2f3a;\n-}\n-\n-* {\n-  box-sizing: border-box;\n-}\n-\n-body {\n-  margin: 0;\n-  font-family: system-ui, -apple-system, sans-serif;\n-  background: var(--bg);\n-  color: var(--fg);\n-  line-height: 1.5;\n-}\n-\n-.muted {\n-  color: var(--muted);\n-}\n-\n-.small {\n-  font-size: 0.875rem;\n-}\n-\n-.view-meta {\n-  position: fixed;\n-  top: 0.5rem;\n-  right: 0.5rem;\n-  font-size: 0.75rem;\n-}\n-\n-#controls {\n-  position: fixed;\n-  bottom: 0;\n-  left: 0;\n-  right: 0;\n-  display: flex;\n-  gap: 1rem;\n-  align-items: center;\n-  padding: 0.75rem 1rem;\n-  background: var(--panel);\n-  border-top: 1px solid var(--border);\n-  font-size: 0.875rem;\n-}\n-\n-#controls a {\n-  color: var(--accent);\n-}\n-\n-.demo-panel {\n-  max-width: 40rem;\n-  margin: 4rem auto 6rem;\n-  padding: 2rem;\n-  background: var(--panel);\n-  border: 1px solid var(--border);\n-  border-radius: 8px;\n-}\n-\n-.demo-panel h1 {\n-  margin-top: 0;\n-}\n-\n-.btn-primary {\n-  background: var(--accent);\n-  color: #0f1115;\n-  border: none;\n-  padding: 0.5rem 1rem;\n-  border-radius: 4px;\n-  font-size: 1rem;\n-  cursor: pointer;\n-}\n-\n-.btn-primary:hover {\n-  filter: brightness(1.1);\n-}\n-\n-code {\n-  font-size: 0.85em;\n-  background: var(--bg);\n-  padding: 0.1em 0.35em;\n-  border-radius: 3px;\n-}\n-\n-.vote-fields {\n-  display: flex;\n-  flex-direction: column;\n-  gap: 0.75rem;\n-  margin-bottom: 1rem;\n-}\n-\n-.vote-fields label {\n-  display: flex;\n-  flex-direction: column;\n-  gap: 0.25rem;\n-}\n-\n-.vote-fields input {\n-  padding: 0.4rem 0.5rem;\n-  border: 1px solid var(--border);\n-  border-radius: 4px;\n-  background: var(--bg);\n-  color: var(--fg);\n-}\n-\n-.rank-list {\n-  margin: 0;\n-  padding-left: 0;\n-  list-style: none;\n-}\n-\n-.rank-list li {\n-  margin-bottom: 0.35rem;\n-}\n-\n-.rank-num {\n-  color: var(--muted);\n-}\n-\n-#parser-input {\n-  width: 100%;\n-  padding: 0.5rem;\n-  border: 1px solid var(--border);\n-  border-radius: 4px;\n-  background: var(--bg);\n-  color: var(--fg);\n-  font-size: 1rem;\n-  font-family: inherit;\n-  resize: vertical;\n-}\n-\n-#parser-form .btn-primary {\n-  margin-top: 0.5rem;\n-}\n-\n-.breadcrumbs {\n-  font-size: 0.875rem;\n-  margin-bottom: 1rem;\n-  color: var(--muted);\n-}\n-\n-.breadcrumbs a {\n-  color: var(--accent);\n-  text-decoration: none;\n-}\n-\n-.breadcrumbs a:hover {\n-  text-decoration: underline;\n-}\n-\n-.breadcrumbs .separator {\n-  color: var(--muted);\n-}\n-\n-.rank-list a {\n-  color: var(--accent);\n-  text-decoration: none;\n-}\n-\n-.rank-list a:hover {\n-  text-decoration: underline;\n-}\n-\n-.entity-card h2 {\n-  margin-top: 0;\n-}\n-\n-.scope-name {\n-  color: var(--accent);\n-  font-weight: 600;\n-}\n-\n-.rank-heading {\n-  margin: 0.75rem 0 0.25rem;\n-  text-transform: uppercase;\n-  letter-spacing: 0.04em;\n-}\n-\n-.rank-gap {\n-  text-align: center;\n-  margin: 0.25rem 0;\n-}\ndiff --git a/server/static/theme_retro.css b/server/static/theme_retro.css\ndeleted file mode 100644\nindex ceee99494b873a6e658857be97f02ee739db85e9..0000000000000000000000000000000000000000\n--- a/server/static/theme_retro.css\n+++ /dev/null\n@@ -1,5 +0,0 @@\n-@import url(\"/static/theme_default.css\");\n-\n-:root {\n-  --accent: #f4a261;\n-}\ndiff --git a/server/tests/integration_ui.rs b/server/tests/integration_ui.rs\nindex f7ac9c26bf9f9277ad5f5708603224c095165fb8..df7d9ab357531c5146d0b326c149fdaa6b531a4a 100644\n--- a/server/tests/integration_ui.rs\n+++ b/server/tests/integration_ui.rs\n@@ -70,6 +70,22 @@ async fn post_ui_record_vote_morphs_ranking_and_persists() {\n     assert_eq!(ranked[0].item.as_str(), \"alpha\");\n }\n \n+#[tokio::test]\n+async fn browse_url_renders_subreddit_page() {\n+    let (addr, _tmp) = start_test_server().await;\n+    let client = reqwest::Client::new();\n+    let html = client\n+        .get(format!(\"http://{addr}/~/https://reddit.com/r/rust\"))\n+        .send()\n+        .await\n+        .unwrap()\n+        .text()\n+        .await\n+        .unwrap();\n+    assert!(html.contains(\"ranking-panel\"));\n+    assert!(html.contains(\"/~/https://reddit.com/r/rust\"));\n+}\n+\n #[tokio::test]\n async fn post_ui_parse_query_redirects_to_subreddit() {\n     let (addr, _tmp) = start_test_server().await;\n@@ -93,5 +109,5 @@ async fn post_ui_parse_query_redirects_to_subreddit() {\n         .unwrap();\n \n     assert!(body.contains(\"window.location.href\"));\n-    assert!(body.contains(\"/?item=reddit.com/r/rust\"));\n+    assert!(body.contains(\"/~/https://reddit.com/r/rust\"));\n }\n\n\nSide B — contributor: tommy-mor\nSide B — commit message:\n[8d8230d1] reddit\n\nSide B — unified diff (full patch):\ndiff --git a/.gitignore b/.gitignore\nindex 4c7073f9fac0c30fd2050d79a60ef447af58ebeb..ada462e900d24a3a6d08165d158c80f79c35a5a5 100644\n--- a/.gitignore\n+++ b/.gitignore\n@@ -7,3 +7,4 @@\n data/\n repomix-output.xml\n dev-data/\n+.env\ndiff --git a/server/Cargo.toml b/server/Cargo.toml\nindex 7906a8547d56b8e6a48ef59c37aa82a8510fdee9..4677fedcb45292eebebe7e9cf6ce2f5738f18ddf 100644\n--- a/server/Cargo.toml\n+++ b/server/Cargo.toml\n@@ -16,6 +16,7 @@ tower = \"0.5\"\n tower-http = { version = \"0.5\", features = [\"trace\"] }\n tracing = \"0.1\"\n tracing-subscriber = { version = \"0.3\", features = [\"env-filter\"] }\n+reqwest = { version = \"0.12\", features = [\"json\"] }\n \n [dev-dependencies]\n reqwest = { version = \"0.12\", features = [\"json\"] }\ndiff --git a/server/src/html/mod.rs b/server/src/html/mod.rs\nindex 2864407ed6e8ec284a1dc663acf1805534566b62..df6505021d9f446c2b453e20e3eb3cf696a111f9 100644\n--- a/server/src/html/mod.rs\n+++ b/server/src/html/mod.rs\n@@ -272,5 +272,16 @@ pub async fn home(State(state): State<AppState>, uri: Uri) -> impl IntoResponse\n \n pub async fn browse(State(state): State<AppState>, uri: Uri) -> impl IntoResponse {\n     let item = ItemId::from_browse_uri(uri.path()).unwrap_or(ItemId::root());\n+    if item.as_str().starts_with(\"reddit.com\") {\n+        let needs_fetch = {\n+            let tree = state.tree.read().await;\n+            tree.get(&item)\n+                .map(|n| n.data.is_none())\n+                .unwrap_or(true)\n+        };\n+        if needs_fetch {\n+            state.reddit.request_fetch(item.clone());\n+        }\n+    }\n     item_page(state, uri, item).await\n }\ndiff --git a/server/src/reddit.rs b/server/src/reddit.rs\nindex d203dca09245daf869b3aa942898447700ae69fb..90053ad03b1d7c8e94f325dd4ee64c2b4f7da900 100644\n--- a/server/src/reddit.rs\n+++ b/server/src/reddit.rs\n@@ -1,4 +1,12 @@\n-//! Reddit API import (async, decoupled from UI request path).\n+//! Reddit API import via a single background worker (rate limits, dedup, backoff).\n+\n+use std::collections::{HashMap, HashSet};\n+use std::sync::Arc;\n+use std::time::{Duration, Instant};\n+\n+use reqwest::{header, Client, StatusCode};\n+use serde::Deserialize;\n+use tokio::sync::{mpsc, RwLock};\n \n use crate::{\n     path_types::ItemId,\n@@ -10,12 +18,401 @@ pub fn ensure_partial_tree(tree: &mut GlobalTree, id: &ItemId) {\n     tree.ensure_path(id);\n }\n \n-/// Placeholder for Reddit JSON import. Returns entity data when implemented.\n-pub async fn fetch_reddit_entity(_id: &ItemId) -> Option<EntityData> {\n-    None\n+pub struct RedditCommand {\n+    pub id: ItemId,\n+}\n+\n+#[derive(Clone)]\n+pub struct RedditBroker {\n+    tx: mpsc::Sender<RedditCommand>,\n+}\n+\n+#[derive(Clone)]\n+struct RedditCredentials {\n+    client_id: String,\n+    client_secret: String,\n+}\n+\n+struct OAuthToken {\n+    access_token: String,\n+    expires_at: Instant,\n+}\n+\n+impl RedditBroker {\n+    pub fn spawn(tree: Arc<RwLock<GlobalTree>>, user_agent: &str) -> Self {\n+        let (tx, rx) = mpsc::channel(100);\n+\n+        let mut headers = header::HeaderMap::new();\n+        headers.insert(\n+            header::USER_AGENT,\n+            header::HeaderValue::from_str(user_agent).expect(\"valid user agent\"),\n+        );\n+\n+        let client = Client::builder()\n+            .default_headers(headers)\n+            .timeout(Duration::from_secs(15))\n+            .build()\n+            .expect(\"reqwest client\");\n+\n+        let creds = RedditCredentials::from_env();\n+        tokio::spawn(reddit_worker(rx, tree, client, creds));\n+\n+        Self { tx }\n+    }\n+\n+    /// Fire-and-forget: queue a fetch; worker updates the tree when done.\n+    pub fn request_fetch(&self, id: ItemId) {\n+        let _ = self.tx.try_send(RedditCommand { id });\n+    }\n+}\n+\n+impl RedditCredentials {\n+    fn from_env() -> Option<Self> {\n+        let client_id = std::env::var(\"REDDIT_CLIENT_ID\").ok()?;\n+        let client_secret = std::env::var(\"REDDIT_CLIENT_SECRET\").ok()?;\n+        if client_id.is_empty() || client_secret.is_empty() {\n+            return None;\n+        }\n+        Some(Self {\n+            client_id,\n+            client_secret,\n+        })\n+    }\n+}\n+\n+pub fn default_user_agent() -> String {\n+    std::env::var(\"REDDIT_USER_AGENT\").unwrap_or_else(|_| {\n+        \"web:sorter2.social:v0.0.1 (by /u/sorter2)\".to_string()\n+    })\n }\n \n-/// Apply fetched entity data to a node (called from async worker).\n-pub fn apply_entity(tree: &mut GlobalTree, id: &ItemId, data: EntityData) {\n-    tree.set_entity_data(id, data);\n+async fn reddit_worker(\n+    mut rx: mpsc::Receiver<RedditCommand>,\n+    tree: Arc<RwLock<GlobalTree>>,\n+    client: Client,\n+    creds: Option<RedditCredentials>,\n+) {\n+    let mut in_flight = HashSet::new();\n+    let mut recently_fetched: HashMap<ItemId, Instant> = HashMap::new();\n+    let mut current_delay = Duration::from_secs(1);\n+    let mut oauth: Option<OAuthToken> = None;\n+    let cache_ttl = Duration::from_secs(300);\n+\n+    while let Some(cmd) = rx.recv().await {\n+        let now = Instant::now();\n+        recently_fetched.retain(|_, t| now.duration_since(*t) < cache_ttl);\n+\n+        if in_flight.contains(&cmd.id) || recently_fetched.contains_key(&cmd.id) {\n+            continue;\n+        }\n+\n+        in_flight.insert(cmd.id.clone());\n+        let fetch_id = cmd.id.clone();\n+\n+        tokio::time::sleep(current_delay).await;\n+\n+        if let Some(c) = &creds {\n+            oauth = ensure_oauth_token(&client, c, oauth.take()).await;\n+        }\n+\n+        let token = oauth.as_ref().map(|t| t.access_token.as_str());\n+        let use_oauth = token.is_some();\n+\n+        match do_fetch(&client, &fetch_id, use_oauth, token).await {\n+            Ok(FetchOutcome::Entity(data)) => {\n+                let mut w = tree.write().await;\n+                w.set_entity_data(&fetch_id, data);\n+                recently_fetched.insert(fetch_id.clone(), Instant::now());\n+                current_delay = Duration::from_millis(600);\n+            }\n+            Ok(FetchOutcome::NotFound) => {\n+                recently_fetched.insert(fetch_id.clone(), Instant::now());\n+            }\n+            Ok(FetchOutcome::RateLimited { reset_secs }) => {\n+                let wait = Duration::from_secs(reset_secs.max(1));\n+                tracing::warn!(\n+                    \"Reddit rate limit for {}; sleeping {}s\",\n+                    fetch_id,\n+                    wait.as_secs()\n+                );\n+                tokio::time::sleep(wait).await;\n+                current_delay = (current_delay * 2).min(Duration::from_secs(60));\n+            }\n+            Err(e) => {\n+                tracing::warn!(\"Reddit fetch failed for {}: {}\", fetch_id, e);\n+                current_delay = (current_delay * 2).min(Duration::from_secs(60));\n+            }\n+        }\n+\n+        in_flight.remove(&fetch_id);\n+    }\n+}\n+\n+enum FetchOutcome {\n+    Entity(EntityData),\n+    NotFound,\n+    RateLimited { reset_secs: u64 },\n+}\n+\n+async fn ensure_oauth_token(\n+    client: &Client,\n+    creds: &RedditCredentials,\n+    existing: Option<OAuthToken>,\n+) -> Option<OAuthToken> {\n+    if let Some(t) = existing {\n+        if Instant::now() < t.expires_at - Duration::from_secs(60) {\n+            return Some(t);\n+        }\n+    }\n+\n+    let resp = client\n+        .post(\"https://www.reddit.com/api/v1/access_token\")\n+        .basic_auth(&creds.client_id, Some(&creds.client_secret))\n+        .form(&[(\"grant_type\", \"client_credentials\")])\n+        .send()\n+        .await;\n+\n+    let resp = match resp {\n+        Ok(r) => r,\n+        Err(e) => {\n+            tracing::warn!(\"Reddit OAuth token request failed: {e}\");\n+            return None;\n+        }\n+    };\n+\n+    if !resp.status().is_success() {\n+        tracing::warn!(\"Reddit OAuth token HTTP {}\", resp.status());\n+        return None;\n+    }\n+\n+    #[derive(Deserialize)]\n+    struct TokenResponse {\n+        access_token: String,\n+        expires_in: u64,\n+    }\n+\n+    let body: TokenResponse = match resp.json().await {\n+        Ok(b) => b,\n+        Err(e) => {\n+            tracing::warn!(\"Reddit OAuth token parse failed: {e}\");\n+            return None;\n+        }\n+    };\n+\n+    Some(OAuthToken {\n+        access_token: body.access_token,\n+        expires_at: Instant::now() + Duration::from_secs(body.expires_in),\n+    })\n+}\n+\n+async fn do_fetch(\n+    client: &Client,\n+    id: &ItemId,\n+    use_oauth: bool,\n+    bearer: Option<&str>,\n+) -> Result<FetchOutcome, String> {\n+    let url = map_item_to_reddit_api(id, use_oauth);\n+    if url.is_empty() {\n+        return Ok(FetchOutcome::NotFound);\n+    }\n+\n+    let mut req = client.get(&url);\n+    if let Some(token) = bearer {\n+        req = req.bearer_auth(token);\n+    }\n+\n+    let resp = req.send().await.map_err(|e| e.to_string())?;\n+\n+    if resp.status() == StatusCode::TOO_MANY_REQUESTS {\n+        let reset = rate_limit_reset_secs(&resp);\n+        return Ok(FetchOutcome::RateLimited { reset_secs: reset });\n+    }\n+\n+    if resp.status() == StatusCode::SERVICE_UNAVAILABLE {\n+        return Err(\"Reddit unavailable (503)\".to_string());\n+    }\n+\n+    if !resp.status().is_success() {\n+        return Ok(FetchOutcome::NotFound);\n+    }\n+\n+    if rate_limit_remaining(&resp) == Some(0) {\n+        let reset = rate_limit_reset_secs(&resp);\n+        return Ok(FetchOutcome::RateLimited { reset_secs: reset });\n+    }\n+\n+    let bytes = resp.bytes().await.map_err(|e| e.to_string())?;\n+    Ok(parse_reddit_json(id, &bytes)\n+        .map(FetchOutcome::Entity)\n+        .unwrap_or(FetchOutcome::NotFound))\n+}\n+\n+fn rate_limit_remaining(resp: &reqwest::Response) -> Option<u64> {\n+    resp.headers()\n+        .get(\"x-ratelimit-remaining\")\n+        .and_then(|v| v.to_str().ok())\n+        .and_then(|s| s.parse::<f64>().ok())\n+        .map(|f| f.floor() as u64)\n+}\n+\n+fn rate_limit_reset_secs(resp: &reqwest::Response) -> u64 {\n+    resp.headers()\n+        .get(\"x-ratelimit-reset\")\n+        .and_then(|v| v.to_str().ok())\n+        .and_then(|s| s.parse::<f64>().ok())\n+        .map(|f| f.ceil() as u64)\n+        .unwrap_or(5)\n+}\n+\n+/// Map canonical item id to Reddit JSON API URL.\n+pub fn map_item_to_reddit_api(id: &ItemId, oauth: bool) -> String {\n+    let path = id.as_str();\n+    if !path.starts_with(\"reddit.com/\") && path != \"reddit.com\" {\n+        return String::new();\n+    }\n+\n+    let base = if oauth {\n+        \"https://oauth.reddit.com\"\n+    } else {\n+        \"https://www.reddit.com\"\n+    };\n+\n+    let segments: Vec<&str> = path.split('/').collect();\n+\n+    if let Some(i) = segments.iter().position(|&p| p == \"comments\") {\n+        if segments.len() > i + 1 {\n+            let api_path = segments[1..=i + 1].join(\"/\");\n+            return format!(\"{base}/{api_path}.json?raw_json=1\");\n+        }\n+    }\n+\n+    if segments.len() == 3 && segments[1] == \"r\" {\n+        return format!(\"{base}/r/{}/about.json?raw_json=1\", segments[2]);\n+    }\n+\n+    String::new()\n+}\n+\n+fn parse_reddit_json(id: &ItemId, bytes: &[u8]) -> Option<EntityData> {\n+    let v: serde_json::Value = serde_json::from_slice(bytes).ok()?;\n+    let segments: Vec<&str> = id.as_str().split('/').collect();\n+\n+    if segments.iter().any(|&p| p == \"comments\") {\n+        parse_post_listing(&v)\n+    } else {\n+        parse_subreddit_about(&v)\n+    }\n+}\n+\n+fn parse_subreddit_about(v: &serde_json::Value) -> Option<EntityData> {\n+    let data = v.get(\"data\")?;\n+    let title = data\n+        .get(\"title\")\n+        .or_else(|| data.get(\"display_name\"))\n+        .and_then(|t| t.as_str())?\n+        .to_string();\n+    let body_html = data\n+        .get(\"public_description_html\")\n+        .or_else(|| data.get(\"public_description\"))\n+        .and_then(|t| t.as_str())\n+        .map(|s| s.to_string());\n+    let thumb_url = data\n+        .get(\"icon_img\")\n+        .or_else(|| data.get(\"community_icon\"))\n+        .and_then(|t| t.as_str())\n+        .filter(|s| !s.is_empty())\n+        .map(|s| s.to_string());\n+\n+    Some(EntityData {\n+        title,\n+        author: None,\n+        body_html,\n+        thumb_url,\n+    })\n+}\n+\n+fn parse_post_listing(v: &serde_json::Value) -> Option<EntityData> {\n+    let listing = v.as_array()?.first()?;\n+    let child = listing\n+        .pointer(\"/data/children/0/data\")?;\n+    let title = child.get(\"title\")?.as_str()?.to_string();\n+    let author = child\n+        .get(\"author\")\n+        .and_then(|a| a.as_str())\n+        .filter(|a| *a != \"[deleted]\")\n+        .map(|s| s.to_string());\n+    let body_html = child\n+        .get(\"selftext_html\")\n+        .and_then(|t| t.as_str())\n+        .filter(|s| !s.is_empty())\n+        .map(|s| s.to_string());\n+    let thumb_url = child\n+        .get(\"thumbnail\")\n+        .and_then(|t| t.as_str())\n+        .filter(|s| s.starts_with(\"http\"))\n+        .map(|s| s.to_string());\n+\n+    Some(EntityData {\n+        title,\n+        author,\n+        body_html,\n+        thumb_url,\n+    })\n+}\n+\n+#[cfg(test)]\n+mod tests {\n+    use super::*;\n+\n+    #[test]\n+    fn map_subreddit_about_url() {\n+        let id = ItemId::parse(\"reddit.com/r/rust\").unwrap();\n+        assert_eq!(\n+            map_item_to_reddit_api(&id, false),\n+            \"https://www.reddit.com/r/rust/about.json?raw_json=1\"\n+        );\n+        assert_eq!(\n+            map_item_to_reddit_api(&id, true),\n+            \"https://oauth.reddit.com/r/rust/about.json?raw_json=1\"\n+        );\n+    }\n+\n+    #[test]\n+    fn map_post_url() {\n+        let id =\n+            ItemId::parse(\"reddit.com/r/amitheasshole/comments/1trnvdl\").unwrap();\n+        assert_eq!(\n+            map_item_to_reddit_api(&id, false),\n+            \"https://www.reddit.com/r/amitheasshole/comments/1trnvdl.json?raw_json=1\"\n+        );\n+    }\n+\n+    #[test]\n+    fn map_non_reddit_empty() {\n+        let id = ItemId::opaque(\"example.com/foo\");\n+        assert!(map_item_to_reddit_api(&id, false).is_empty());\n+    }\n+\n+    #[test]\n+    fn parse_subreddit_fixture() {\n+        let json = r#\"{\"kind\":\"t5\",\"data\":{\"title\":\"Rust\",\"display_name\":\"rust\",\"public_description\":\"systems\"}}\"#;\n+        let entity = parse_reddit_json(\n+            &ItemId::parse(\"reddit.com/r/rust\").unwrap(),\n+            json.as_bytes(),\n+        )\n+        .unwrap();\n+        assert_eq!(entity.title, \"Rust\");\n+    }\n+\n+    #[test]\n+    fn parse_post_fixture() {\n+        let json = r#\"[{\"kind\":\"Listing\",\"data\":{\"children\":[{\"kind\":\"t3\",\"data\":{\"title\":\"AITA\",\"author\":\"op\",\"selftext_html\":\"&lt;p&gt;hi&lt;/p&gt;\",\"thumbnail\":\"https://b.thumbs.redditmedia.com/x.jpg\"}}]}}]\"#;\n+        let entity = parse_reddit_json(\n+            &ItemId::parse(\"reddit.com/r/x/comments/abc\").unwrap(),\n+            json.as_bytes(),\n+        )\n+        .unwrap();\n+        assert_eq!(entity.title, \"AITA\");\n+        assert_eq!(entity.author.as_deref(), Some(\"op\"));\n+    }\n }\ndiff --git a/server/src/state.rs b/server/src/state.rs\nindex cc1722f5a5bf4d415f2327ea585c488a15a75592..8c03aa60c15aee803a534439400b69935b1a3d84 100644\n--- a/server/src/state.rs\n+++ b/server/src/state.rs\n@@ -5,9 +5,10 @@ use tokio::sync::RwLock;\n use crate::{\n     event_log::EventLog,\n     events::Event,\n+    journal::JournalClient,\n     path_types::ItemId,\n+    reddit::{default_user_agent, RedditBroker},\n     reducer::{GlobalTree, VoteData},\n-    journal::JournalClient,\n     views::ViewStore,\n };\n \n@@ -73,6 +74,7 @@ pub struct AppState {\n     pub views: ViewStore,\n     pub tree: Arc<RwLock<GlobalTree>>,\n     journal: JournalClient,\n+    pub reddit: RedditBroker,\n }\n \n impl AppState {\n@@ -112,6 +114,7 @@ impl AppState {\n \n         let tree = Arc::new(RwLock::new(tree));\n         let journal = JournalClient::spawn(tree.clone(), event_log.clone());\n+        let reddit = RedditBroker::spawn(tree.clone(), &default_user_agent());\n \n         Self {\n             cfg: Arc::new(cfg),\n@@ -119,6 +122,7 @@ impl AppState {\n             views,\n             tree,\n             journal,\n+            reddit,\n         }\n     }\n \n@@ -127,8 +131,11 @@ impl AppState {\n             id: id.as_str().to_string(),\n         };\n         self.event_log.append(&event).await.map_err(|e| e.to_string())?;\n-        let mut w = self.tree.write().await;\n-        w.ensure_path(id);\n+        {\n+            let mut w = self.tree.write().await;\n+            w.ensure_path(id);\n+        }\n+        self.reddit.request_fetch(id.clone());\n         Ok(())\n     }\n \ndiff --git a/todo b/todo\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..d196e8cb4cc80ccb95eeff01c73607d520e13212\n--- /dev/null\n+++ b/todo\n@@ -0,0 +1,7 @@\n+reddit import (only on explicit request)\n+reddit rendering\n+vote redering\n+pair chosing\n+nsfw gate\n+\n+logins (uuid user, two sides, oauths, and pseudonyms)\n","role":"user"}],"model":"openai/gpt-chat-latest"}