{"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[075d4d37] Fix OAuth test mocks so Clojure E2E auth flows work again.\n\nHttpServer handlers were crashing on query parsing and token POSTs, which broke Playwright login; also read alias/history via real CSS selectors.\n\nCo-authored-by: Cursor <cursoragent@cursor.com>\n\nSide A — unified diff (full patch):\ndiff --git a/test/auth_login.clj b/test/auth_login.clj\nindex 6f2f00d7aa7340e63d1ac465b0a2234cec7a983f..aa63b66ccb2471b710ba3d168d0461252b39fc10 100644\n--- a/test/auth_login.clj\n+++ b/test/auth_login.clj\n@@ -14,27 +14,27 @@\n (defn- type-alias! [pg text]\n   (page/evaluate pg\n                  (.replace\n-                  \"(() => { const i = document.getElementById('alias-input'); const f = document.getElementById('alias-check-form'); if (!i || !f) return;\n+                  \"(() => { const i = document.getElementById('alias-input'); const f = document.getElementById('alias-check-form'); if (!i || !f) return Promise.resolve('missing-form');\n                     i.value = __TEXT__;\n                     const cf = document.getElementById('alias-claim-field'); if (cf) cf.value = i.value;\n                     return fetch(f.action, { method: 'POST', credentials: 'same-origin',\n                       headers: { 'Content-Type': 'application/x-www-form-urlencoded' },\n                       body: new URLSearchParams(new FormData(f)).toString() })\n                       .then(function (r) { return r.text(); })\n-                      .then(function (t) { eval(t); }); })()\"\n+                      .then(function (t) { eval(t); return document.getElementById('alias-status')?.textContent || ''; }); })()\"\n                   \"__TEXT__\"\n-                  (pr-str text)))\n-  (Thread/sleep 400))\n+                  (pr-str text))))\n \n-(defn- element-text [pg test-id]\n+(defn- element-text [pg selector]\n   (let [raw (page/evaluate pg\n-                           (str \"document.querySelector('[data-testid=\\\"\" test-id \"\\\"]')?.textContent || ''\"))]\n+                           (str \"document.querySelector(\" (pr-str selector) \")?.textContent || ''\"))]\n     (when (string? raw) (str/trim raw))))\n \n (defn- wait-for-text [pg test-id text timeout-ms]\n-  (let [deadline (+ (System/currentTimeMillis) timeout-ms)]\n+  (let [deadline (+ (System/currentTimeMillis) timeout-ms)\n+        selector (str \"[data-testid=\\\"\" test-id \"\\\"]\")]\n     (loop []\n-      (let [got (or (element-text pg test-id) \"\")]\n+      (let [got (or (element-text pg selector) \"\")]\n         (cond\n           (= got text) got\n           (< (System/currentTimeMillis) deadline) (do (Thread/sleep 200) (recur))\ndiff --git a/test/support/mock_oauth.clj b/test/support/mock_oauth.clj\nindex 5ba7e9be3cf6d2226648e9609a09ed45f306930f..333fe08d56cb06bac2a338cad1c73894d54c4495 100644\n--- a/test/support/mock_oauth.clj\n+++ b/test/support/mock_oauth.clj\n@@ -7,7 +7,7 @@\n (defn- query-param [query key]\n   (when query\n     (some (fn [pair]\n-            (let [[k v] (str/split pair \"=\" 2)]\n+            (let [[k v] (str/split pair #\"=\" 2)]\n               (when (= k key)\n                 (URLDecoder/decode (or v \"\") \"UTF-8\"))))\n           (str/split query #\"&\"))))\n@@ -31,11 +31,11 @@\n \n (defn- send-redirect [^HttpExchange ex location]\n   (.set (.getResponseHeaders ex) \"Location\" location)\n-  (.sendResponseHeaders ex 302 -1)\n+  (.sendResponseHeaders ex 302 0)\n   (.close (.getResponseBody ex)))\n \n (defn- read-form [^HttpExchange ex]\n-  (let [body (slurp (.getInputStream ex))]\n+  (let [body (slurp (.getRequestBody ex))]\n     {:code (query-param body \"code\")\n      :grant (query-param body \"grant_type\")}))\n \n@@ -45,7 +45,7 @@\n           (str/replace #\"^[Bb]earer \" \"\")))\n \n (defn- parse-token-user [token]\n-  (when (str/starts-with? token \"mock:\")\n+  (when (and token (str/starts-with? token \"mock:\"))\n     (parse-mock-user (subs token 5))))\n \n (defn- authorize-redirect [exchange query]\n@@ -55,7 +55,7 @@\n         user (parse-mock-user mock-user)\n         code (str \"mock:\" (:id user) \":\" (:login user))\n         loc (str redirect-uri \"?code=\" (java.net.URLEncoder/encode code \"UTF-8\")\n-                 \"&state=\" (java.net.URLEncoder/encode state \"UTF-8\"))]\n+                 \"&state=\" (java.net.URLEncoder/encode (or state \"\") \"UTF-8\"))]\n     (send-redirect exchange loc)))\n \n (defn start-mock-oauth\n@@ -65,49 +65,56 @@\n         handler\n         (proxy [HttpHandler] []\n           (handle [^HttpExchange exchange]\n-            (let [uri (.getRequestURI exchange)\n-                  path (.getPath uri)\n-                  query (.getQuery uri)\n-                  method (.getRequestMethod exchange)]\n-              (cond\n-                ;; GitHub authorize\n-                (str/ends-with? path \"/login/oauth/authorize\")\n-                (authorize-redirect exchange query)\n+            (try\n+              (let [uri (.getRequestURI exchange)\n+                    path (.getPath uri)\n+                    query (.getQuery uri)\n+                    method (.getRequestMethod exchange)]\n+                (cond\n+                  ;; GitHub authorize\n+                  (str/ends-with? path \"/login/oauth/authorize\")\n+                  (authorize-redirect exchange query)\n \n-                ;; Reddit authorize\n-                (str/ends-with? path \"/api/v1/authorize\")\n-                (authorize-redirect exchange query)\n+                  ;; Reddit authorize\n+                  (str/ends-with? path \"/api/v1/authorize\")\n+                  (authorize-redirect exchange query)\n \n-                ;; GitHub token\n-                (and (= method \"POST\") (str/ends-with? path \"/login/oauth/access_token\"))\n-                (let [code (or (:code (read-form exchange)) \"mock:1002:newbie\")]\n-                  (send-json exchange 200 (str \"{\\\"access_token\\\":\\\"\" code \"\\\",\\\"token_type\\\":\\\"bearer\\\"}\")))\n+                  ;; GitHub token\n+                  (and (= method \"POST\") (str/ends-with? path \"/login/oauth/access_token\"))\n+                  (let [code (or (:code (read-form exchange)) \"mock:1002:newbie\")]\n+                    (send-json exchange 200 (str \"{\\\"access_token\\\":\\\"\" code \"\\\",\\\"token_type\\\":\\\"bearer\\\"}\")))\n \n-                ;; Reddit token (client_credentials for import + authorization_code for login)\n-                (and (= method \"POST\") (str/ends-with? path \"/api/v1/access_token\"))\n-                (let [form (read-form exchange)\n-                      grant (or (:grant form) \"\")\n-                      code (or (:code form) \"mock:t2_test:redditor\")]\n-                  (if (= grant \"client_credentials\")\n-                    (send-json exchange 200 \"{\\\"access_token\\\":\\\"app-token\\\",\\\"token_type\\\":\\\"bearer\\\",\\\"expires_in\\\":3600}\")\n-                    (send-json exchange 200 (str \"{\\\"access_token\\\":\\\"\" code \"\\\",\\\"token_type\\\":\\\"bearer\\\",\\\"expires_in\\\":3600}\"))))\n+                  ;; Reddit token (client_credentials for import + authorization_code for login)\n+                  (and (= method \"POST\") (str/ends-with? path \"/api/v1/access_token\"))\n+                  (let [form (read-form exchange)\n+                        grant (or (:grant form) \"\")\n+                        code (or (:code form) \"mock:t2_test:redditor\")]\n+                    (if (= grant \"client_credentials\")\n+                      (send-json exchange 200 \"{\\\"access_token\\\":\\\"app-token\\\",\\\"token_type\\\":\\\"bearer\\\",\\\"expires_in\\\":3600}\")\n+                      (send-json exchange 200 (str \"{\\\"access_token\\\":\\\"\" code \"\\\",\\\"token_type\\\":\\\"bearer\\\",\\\"expires_in\\\":3600}\"))))\n \n-                ;; GitHub user\n-                (= path \"/user\")\n-                (let [token (bearer-token exchange)\n-                      user (or (parse-token-user token) {:id \"1002\" :login \"newbie\" :numeric? true})]\n-                  (send-json exchange 200\n-                             (str \"{\\\"id\\\":\" (:id user) \",\\\"login\\\":\\\"\" (:login user) \"\\\"}\")))\n+                  ;; GitHub user\n+                  (= path \"/user\")\n+                  (let [token (bearer-token exchange)\n+                        user (or (parse-token-user token) {:id \"1002\" :login \"newbie\" :numeric? true})]\n+                    (send-json exchange 200\n+                               (str \"{\\\"id\\\":\" (:id user) \",\\\"login\\\":\\\"\" (:login user) \"\\\"}\")))\n \n-                ;; Reddit /api/v1/me\n-                (str/ends-with? path \"/api/v1/me\")\n-                (let [token (bearer-token exchange)\n-                      user (or (parse-token-user token) {:id \"t2_test\" :login \"redditor\"})]\n-                  (send-json exchange 200\n-                             (str \"{\\\"id\\\":\\\"\" (:id user) \"\\\",\\\"name\\\":\\\"\" (:login user) \"\\\"}\")))\n+                  ;; Reddit /api/v1/me\n+                  (str/ends-with? path \"/api/v1/me\")\n+                  (let [token (bearer-token exchange)\n+                        user (or (parse-token-user token) {:id \"t2_test\" :login \"redditor\"})]\n+                    (send-json exchange 200\n+                               (str \"{\\\"id\\\":\\\"\" (:id user) \"\\\",\\\"name\\\":\\\"\" (:login user) \"\\\"}\")))\n \n-                :else\n-                (send-json exchange 404 \"{\\\"error\\\":\\\"not found\\\"}\")))))]\n+                  :else\n+                  (send-json exchange 404 \"{\\\"error\\\":\\\"not found\\\"}\")))\n+              (catch Throwable t\n+                (binding [*out* *err*]\n+                  (println \"mock-oauth handler error:\" t))\n+                (try\n+                  (send-json exchange 500 \"{\\\"error\\\":\\\"mock-oauth internal\\\"}\")\n+                  (catch Throwable _))))))]\n     (.createContext server \"/\" handler)\n     (.setExecutor server nil)\n     (.start server)\ndiff --git a/test/support/mock_reddit.clj b/test/support/mock_reddit.clj\nindex a630cf0938722193e9af88382d60e777ff371be4..faa27945b6394363914c853627a0bad1e819a5f9 100644\n--- a/test/support/mock_reddit.clj\n+++ b/test/support/mock_reddit.clj\n@@ -12,7 +12,7 @@\n (defn- query-param [query key]\n   (when query\n     (some (fn [pair]\n-            (let [[k v] (str/split pair \"=\" 2)]\n+            (let [[k v] (str/split pair #\"=\" 2)]\n               (when (= k key)\n                 (URLDecoder/decode (or v \"\") \"UTF-8\"))))\n           (str/split query #\"&\"))))\n@@ -34,11 +34,11 @@\n \n (defn- send-redirect [^HttpExchange ex location]\n   (.set (.getResponseHeaders ex) \"Location\" location)\n-  (.sendResponseHeaders ex 302 -1)\n+  (.sendResponseHeaders ex 302 0)\n   (.close (.getResponseBody ex)))\n \n (defn- read-form [^HttpExchange ex]\n-  (let [body (slurp (.getInputStream ex))]\n+  (let [body (slurp (.getRequestBody ex))]\n     {:code (query-param body \"code\")\n      :grant (query-param body \"grant_type\")}))\n \n@@ -48,7 +48,7 @@\n           (str/replace #\"^[Bb]earer \" \"\")))\n \n (defn- parse-token-user [token]\n-  (when (str/starts-with? token \"mock:\")\n+  (when (and token (str/starts-with? token \"mock:\"))\n     (parse-mock-user (subs token 5))))\n \n (defn start-mock-reddit\n@@ -72,7 +72,7 @@\n                        user (parse-mock-user (query-param query \"mock_user\"))\n                        code (str \"mock:\" (:id user) \":\" (:login user))\n                        loc (str redirect-uri \"?code=\" (java.net.URLEncoder/encode code \"UTF-8\")\n-                                \"&state=\" (java.net.URLEncoder/encode state \"UTF-8\"))]\n+                                \"&state=\" (java.net.URLEncoder/encode (or state \"\") \"UTF-8\"))]\n                    (send-redirect exchange loc))\n \n                  (and (= method \"POST\") (str/ends-with? path \"/api/v1/access_token\"))\n\n\nSide B — contributor: tommy-mor\nSide B — commit message:\n[07715165] nice\n\nSide B — unified diff (full patch):\ndiff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs\nindex c3c62a76f424010d77a6090c84dd0b82098f573e..da2536112faea313352624cf2ce0ddd0ab3377c1 100644\n--- a/server/src/api/ui_html.rs\n+++ b/server/src/api/ui_html.rs\n@@ -6,7 +6,7 @@ use axum::{\n use std::collections::HashMap;\n \n use crate::{\n-    html::{demo_counter_panel, js_string_literal, ranking_panel, JsBuilder},\n+    html::{js_string_literal, ranking_panel, JsBuilder},\n     parser::parse_reddit_url,\n     parser_render::parser_panel_morph,\n     state::AppState,\n@@ -35,13 +35,6 @@ pub async fn post_ui_html(\n     };\n \n     match action {\n-        HtmlUiAction::BumpDemoCounter => {\n-            let count = state.bump_demo_counter().await;\n-            let panel = demo_counter_panel(count, state.event_log.path().to_string_lossy().as_ref());\n-            JsBuilder::new()\n-                .morph_selector(\"#demo-counter-panel\", panel)\n-                .into_response()\n-        }\n         HtmlUiAction::RecordVote {\n             a,\n             b,\n@@ -54,8 +47,8 @@ pub async fn post_ui_html(\n             {\n                 return ui_js_warn(&e).into_response();\n             }\n-            let mut group = state.group.write().await;\n-            let panel = ranking_panel(&mut group);\n+            let group = state.group.read().await;\n+            let panel = ranking_panel(&group);\n             JsBuilder::new()\n                 .morph_selector(\"#ranking-panel\", panel)\n                 .into_response()\n@@ -87,20 +80,6 @@ mod tests {\n         assert!(matches!(err, HtmlUiParseError::MissingRpc));\n     }\n \n-    #[test]\n-    fn bump_action_deserializes() {\n-        let template = serde_json::json!({ \"action\": \"bump_demo_counter\" });\n-        let mut form = HashMap::new();\n-        form.insert(\n-            UI_RPC_FIELD.to_string(),\n-            serde_json::to_string(&template).unwrap(),\n-        );\n-        assert_eq!(\n-            parse_html_ui_from_form(&form).unwrap(),\n-            HtmlUiAction::BumpDemoCounter\n-        );\n-    }\n-\n     #[test]\n     fn record_vote_action_deserializes() {\n         let template = serde_json::json!({\ndiff --git a/server/src/events.rs b/server/src/events.rs\nindex b969242534e184d4f0a689543a479670b08a18df..eff80aef0257f706d2341f666e63d6a3d921bf6e 100644\n--- a/server/src/events.rs\n+++ b/server/src/events.rs\n@@ -5,8 +5,6 @@ use serde::{Deserialize, Serialize};\n pub enum Event {\n     /// Page view recorded (path → counter in views.json).\n     ViewRecorded { path: String, ts: i64 },\n-    /// Demo counter bump from `POST /ui` (persisted in the single JSONL log).\n-    DemoCounterBumped { ts: i64, value: u64 },\n     /// Pairwise comparison vote (replayed into [`crate::reducer::GroupState`] on boot).\n     VoteRecorded {\n         ts: i64,\ndiff --git a/server/src/html/mod.rs b/server/src/html/mod.rs\nindex 5b1d0b5a887d89e7e80796aa7a6c8ed5baaf2782..d69ed962b5c8625bc83c933b1825f2cc1d0868e2 100644\n--- a/server/src/html/mod.rs\n+++ b/server/src/html/mod.rs\n@@ -13,7 +13,7 @@ use crate::{\n     form_template::template_json_compact,\n     parser_action::ParserAction,\n     parser_render::parser_panel,\n-    ranking::ranked_items,\n+    ranking::ranked_items_cached,\n     reducer::GroupState,\n     state::AppState,\n     ui_action::UI_RPC_FIELD,\n@@ -199,10 +199,8 @@ fn layout(title: &str, body: Markup, views: u64, theme: &str, theme_next: &str)\n     }\n }\n \n-pub fn ranking_panel(group: &mut GroupState) -> Markup {\n-    const MAX_ITERS: usize = 10_000;\n-    const TOL: f64 = 1e-8;\n-    let items = ranked_items(group, MAX_ITERS, TOL);\n+pub fn ranking_panel(group: &GroupState) -> Markup {\n+    let items = ranked_items_cached(group);\n     html! {\n         section id=\"ranking-panel\" class=\"demo-panel\" {\n             h2 { \"Ranking\" }\n@@ -260,35 +258,6 @@ pub fn vote_panel() -> Markup {\n }\n \n \n-pub fn demo_counter_panel(count: u64, event_log_path: &str) -> Markup {\n-    let rpc = template_json_compact(&serde_json::json!({ \"action\": \"bump_demo_counter\" }))\n-        .expect(\"rpc json\");\n-    html! {\n-        section id=\"demo-counter-panel\" class=\"demo-panel\" {\n-            h1 { \"sorter2\" }\n-            p class=\"muted\" {\n-                \"Pairwise ranking scaffold — votes persist to JSONL and replay on boot.\"\n-            }\n-            p class=\"demo-count\" {\n-                strong { \"Counter: \" }\n-                span id=\"demo-count-value\" { (count) }\n-            }\n-            p class=\"muted small\" {\n-                \"Event log: \" code { (event_log_path) }\n-            }\n-            form method=\"post\" action=\"/ui\" id=\"demo-bump-form\" {\n-                input type=\"hidden\" name=(UI_RPC_FIELD) value=(rpc);\n-                button type=\"submit\" class=\"btn-primary\" { \"Bump (POST /ui → eval JS)\" }\n-            }\n-            p class=\"muted small\" {\n-                \"Uses hidden \"\n-                code { \"__rpc__\" }\n-                \" JSON + Idiomorph morph — no full page reload.\"\n-            }\n-        }\n-    }\n-}\n-\n pub async fn home(\n     State(state): State<AppState>,\n     jar: CookieJar,\n@@ -297,16 +266,15 @@ pub async fn home(\n     let path = uri.path().to_string();\n     state.views.increment(path.clone());\n     let views = state.views.get_views(&path);\n-    let count = *state.demo_counter.read().await;\n     let theme = theme_from_jar(&jar);\n     let theme_next = theme_next_from_uri(&uri);\n-    let mut group = state.group.write().await;\n+    let group = state.group.read().await;\n     let empty_action = ParserAction::suggest(String::new(), None);\n     let body = html! {\n+        h1 { \"sorter2\" }\n         (parser_panel(\"\", &empty_action))\n         (vote_panel())\n-        (ranking_panel(&mut group))\n-        (demo_counter_panel(count, state.event_log.path().to_string_lossy().as_ref()))\n+        (ranking_panel(&group))\n     };\n     layout(\"sorter2\", body, views, theme, &theme_next)\n }\ndiff --git a/server/src/lib.rs b/server/src/lib.rs\nindex 6716c5b282e7980a7a0f03d63ad8b25eda61cc55..fa423640d598f4ba97a5885d228e78d7b97f7a22 100644\n--- a/server/src/lib.rs\n+++ b/server/src/lib.rs\n@@ -9,6 +9,7 @@ pub mod parser_render;\n pub mod path_types;\n pub mod ranking;\n pub mod reducer;\n+pub mod settlement;\n pub mod state;\n pub mod ui_action;\n pub mod views;\ndiff --git a/server/src/ranking.rs b/server/src/ranking.rs\nindex 89d3280126a8d8f841721ce8cb63ff735d68752a..2d706762792ba9239bb3f1c2e4974a2fde908013 100644\n--- a/server/src/ranking.rs\n+++ b/server/src/ranking.rs\n@@ -91,6 +91,11 @@ pub fn compute_group_ranking(group: &mut GroupState, max_iters: usize, tol: f64)\n \n pub fn ranked_items(group: &mut GroupState, max_iters: usize, tol: f64) -> Vec<RankedItem> {\n     compute_group_ranking(group, max_iters, tol);\n+    ranked_items_cached(group)\n+}\n+\n+/// Read cached scores without recomputing (HTTP fast path).\n+pub fn ranked_items_cached(group: &GroupState) -> Vec<RankedItem> {\n     let mut items: Vec<RankedItem> = group\n         .idx_to_item\n         .iter()\n@@ -105,7 +110,12 @@ pub fn ranked_items(group: &mut GroupState, max_iters: usize, tol: f64) -> Vec<R\n     items\n }\n \n-fn compute_scores_from_edges(n: usize, edges: impl Iterator<Item = ((usize, usize), f64)>, max_iters: usize, tol: f64) -> Vec<f64> {\n+pub fn compute_scores_from_edges(\n+    n: usize,\n+    edges: impl Iterator<Item = ((usize, usize), f64)>,\n+    max_iters: usize,\n+    tol: f64,\n+) -> Vec<f64> {\n     if n == 0 {\n         return vec![];\n     }\ndiff --git a/server/src/settlement.rs b/server/src/settlement.rs\nnew file mode 100644\nindex 0000000000000000000000000000000000000000..1f722ceaea62cda22c28ab71551f259fbf049b81\n--- /dev/null\n+++ b/server/src/settlement.rs\n@@ -0,0 +1,114 @@\n+use std::sync::Arc;\n+\n+use tokio::sync::{mpsc, oneshot, RwLock};\n+\n+use crate::{\n+    event_log::EventLog,\n+    events::Event,\n+    ranking::compute_scores_from_edges,\n+    reducer::{GroupState, VoteData},\n+};\n+\n+const MAX_ITERS: usize = 10_000;\n+const TOL: f64 = 1e-8;\n+\n+pub struct SettlementCommand {\n+    pub vote: VoteData,\n+    pub event: Event,\n+    pub reply: oneshot::Sender<Result<(), String>>,\n+}\n+\n+#[derive(Clone)]\n+pub struct SettlementClient {\n+    tx: mpsc::Sender<SettlementCommand>,\n+}\n+\n+impl SettlementClient {\n+    pub fn spawn(group: Arc<RwLock<GroupState>>, event_log: Arc<EventLog>) -> Self {\n+        let (tx, rx) = mpsc::channel(64);\n+        tokio::spawn(settlement_worker(rx, group, event_log));\n+        Self { tx }\n+    }\n+\n+    pub async fn record_vote(&self, vote: VoteData, event: Event) -> Result<(), String> {\n+        let (reply, rx) = oneshot::channel();\n+        self.tx\n+            .send(SettlementCommand {\n+                vote,\n+                event,\n+                reply,\n+            })\n+            .await\n+            .map_err(|_| \"settlement worker stopped\".to_string())?;\n+        rx.await\n+            .map_err(|_| \"settlement worker stopped\".to_string())?\n+    }\n+}\n+\n+async fn settlement_worker(\n+    mut rx: mpsc::Receiver<SettlementCommand>,\n+    group: Arc<RwLock<GroupState>>,\n+    event_log: Arc<EventLog>,\n+) {\n+    while let Some(first) = rx.recv().await {\n+        let mut batch = vec![first];\n+        while let Ok(more) = rx.try_recv() {\n+            batch.push(more);\n+        }\n+\n+        let mut disk_err: Option<String> = None;\n+        for cmd in &batch {\n+            if let Err(e) = event_log.append(&cmd.event).await {\n+                disk_err = Some(e.to_string());\n+                break;\n+            }\n+        }\n+\n+        if let Some(err) = disk_err {\n+            for cmd in batch {\n+                let _ = cmd.reply.send(Err(err.clone()));\n+            }\n+            continue;\n+        }\n+\n+        let (edges, n) = {\n+            let mut w = group.write().await;\n+            for cmd in &batch {\n+                w.apply_vote(cmd.vote.clone());\n+            }\n+            (w.edges.clone(), w.idx_to_item.len())\n+        };\n+\n+        let new_scores = compute_scores_from_edges(\n+            n,\n+            edges.iter().map(|(&k, &v)| (k, v)),\n+            MAX_ITERS,\n+            TOL,\n+        );\n+\n+        {\n+            let mut w = group.write().await;\n+            w.cached_scores = new_scores;\n+            w.dirty = false;\n+        }\n+\n+        for cmd in batch {\n+            let _ = cmd.reply.send(Ok(()));\n+        }\n+    }\n+}\n+\n+/// Compute ranking cache from current in-memory edges (startup replay only).\n+pub fn warm_ranking_cache(group: &mut GroupState) {\n+    if !group.dirty {\n+        return;\n+    }\n+    let n = group.idx_to_item.len();\n+    group.cached_scores = compute_scores_from_edges(\n+        n,\n+        group.edges.iter().map(|(&k, &v)| (k, v)),\n+        MAX_ITERS,\n+        TOL,\n+    );\n+    group.dirty = false;\n+}\ndiff --git a/server/src/state.rs b/server/src/state.rs\nindex 8ec9902e2ecc31cf8208f7ad6365891dc5537eed..1922541a4064c2de1df2d993a461cae783320e05 100644\n--- a/server/src/state.rs\n+++ b/server/src/state.rs\n@@ -6,6 +6,7 @@ use crate::{\n     event_log::EventLog,\n     events::Event,\n     reducer::{GroupState, VoteData},\n+    settlement::{warm_ranking_cache, SettlementClient},\n     views::ViewStore,\n };\n \n@@ -38,8 +39,8 @@ pub struct AppState {\n     pub cfg: Arc<AppConfig>,\n     pub event_log: Arc<EventLog>,\n     pub views: ViewStore,\n-    pub demo_counter: Arc<RwLock<u64>>,\n     pub group: Arc<RwLock<GroupState>>,\n+    settlement: SettlementClient,\n }\n \n impl AppState {\n@@ -48,14 +49,10 @@ impl AppState {\n         let views_path = format!(\"{}/views.json\", cfg.data_dir);\n         let views = ViewStore::new(&views_path);\n \n-        let mut demo_counter: u64 = 0;\n         let mut group = GroupState::new();\n         if let Ok((events, _)) = event_log.load_all().await {\n             for ev in events {\n                 match ev {\n-                    Event::DemoCounterBumped { value, .. } => {\n-                        demo_counter = demo_counter.max(value);\n-                    }\n                     Event::VoteRecorded {\n                         ts,\n                         a,\n@@ -74,30 +71,20 @@ impl AppState {\n             }\n         }\n \n+        warm_ranking_cache(&mut group);\n+\n+        let group = Arc::new(RwLock::new(group));\n+        let settlement = SettlementClient::spawn(group.clone(), event_log.clone());\n+\n         Self {\n             cfg: Arc::new(cfg),\n             event_log,\n             views,\n-            demo_counter: Arc::new(RwLock::new(demo_counter)),\n-            group: Arc::new(RwLock::new(group)),\n+            group,\n+            settlement,\n         }\n     }\n \n-    pub async fn bump_demo_counter(&self) -> u64 {\n-        let mut guard = self.demo_counter.write().await;\n-        *guard += 1;\n-        let value = *guard;\n-        drop(guard);\n-\n-        let ts = crate::html::now_ms();\n-        let _ = self\n-            .event_log\n-            .append(&Event::DemoCounterBumped { ts, value })\n-            .await;\n-\n-        value\n-    }\n-\n     pub async fn record_vote(\n         &self,\n         a: &str,\n@@ -109,23 +96,14 @@ impl AppState {\n         let vote = VoteData::from_recorded(ts, a, b, ratio_left, ratio_right)\n             .ok_or_else(|| \"invalid vote: need two distinct non-empty items\".to_string())?;\n \n-        {\n-            let mut group = self.group.write().await;\n-            group.apply_vote(vote.clone());\n-        }\n-\n-        let _ = self\n-            .event_log\n-            .append(&Event::VoteRecorded {\n-                ts,\n-                a: vote.a.as_str().to_string(),\n-                b: vote.b.as_str().to_string(),\n-                ratio_left: vote.ratio_left,\n-                ratio_right: vote.ratio_right,\n-            })\n-            .await\n-            .map_err(|e| e.to_string())?;\n+        let event = Event::VoteRecorded {\n+            ts,\n+            a: vote.a.as_str().to_string(),\n+            b: vote.b.as_str().to_string(),\n+            ratio_left: vote.ratio_left,\n+            ratio_right: vote.ratio_right,\n+        };\n \n-        Ok(())\n+        self.settlement.record_vote(vote, event).await\n     }\n }\ndiff --git a/server/src/ui_action.rs b/server/src/ui_action.rs\nindex 1d488e1ad1d8fd81bd9d016d69255adfe9b22fc8..5d94c84113607b3bcd8d31d03ef5b8e1b87b67a7 100644\n--- a/server/src/ui_action.rs\n+++ b/server/src/ui_action.rs\n@@ -12,8 +12,6 @@ pub const UI_RPC_FIELD: &str = \"__rpc__\";\n #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]\n #[serde(tag = \"action\", rename_all = \"snake_case\")]\n pub enum HtmlUiAction {\n-    /// Demo: morph `#demo-counter-panel` after bumping the persisted counter.\n-    BumpDemoCounter,\n     /// Record a pairwise vote and morph `#ranking-panel`.\n     RecordVote {\n         a: String,\n@@ -52,18 +50,6 @@ pub fn parse_html_ui_from_form(\n mod tests {\n     use super::*;\n \n-    #[test]\n-    fn bump_demo_counter_round_trip() {\n-        let template = serde_json::json!({ \"action\": \"bump_demo_counter\" });\n-        let mut form = HashMap::new();\n-        form.insert(\n-            UI_RPC_FIELD.to_string(),\n-            serde_json::to_string(&template).unwrap(),\n-        );\n-        let a = parse_html_ui_from_form(&form).unwrap();\n-        assert_eq!(a, HtmlUiAction::BumpDemoCounter);\n-    }\n-\n     #[test]\n     fn record_vote_round_trip_with_form_holes() {\n         let template = serde_json::json!({\ndiff --git a/server/tests/integration_health.rs b/server/tests/integration_health.rs\nindex 8a58bc14aac68c779e7ce4ffa57d27b3220e9953..1d816e008b9bf629967e3b3c786c41afefc284e3 100644\n--- a/server/tests/integration_health.rs\n+++ b/server/tests/integration_health.rs\n@@ -38,7 +38,7 @@ async fn healthz_ok() {\n }\n \n #[tokio::test]\n-async fn home_has_demo_panel() {\n+async fn home_has_main_panels() {\n     let (addr, _tmp) = start_test_server().await;\n     let client = reqwest::Client::new();\n     let html = client\ndiff --git a/server/tests/integration_ui.rs b/server/tests/integration_ui.rs\nindex bee79407dec120699a083f1a75adf9291e207fc7..7ede46d681fefbe25b1d98fc33520a185515eb1c 100644\n--- a/server/tests/integration_ui.rs\n+++ b/server/tests/integration_ui.rs\n@@ -25,33 +25,6 @@ async fn start_test_server() -> (SocketAddr, TempDir) {\n     (addr, tmp)\n }\n \n-#[tokio::test]\n-async fn post_ui_bump_returns_javascript_morph() {\n-    let (addr, tmp) = start_test_server().await;\n-    let rpc = serde_json::json!({ \"action\": \"bump_demo_counter\" }).to_string();\n-    let mut form = HashMap::new();\n-    form.insert(UI_RPC_FIELD.to_string(), rpc);\n-\n-    let client = reqwest::Client::new();\n-    let body = client\n-        .post(format!(\"http://{addr}/ui\"))\n-        .form(&form)\n-        .send()\n-        .await\n-        .unwrap()\n-        .text()\n-        .await\n-        .unwrap();\n-\n-    assert!(body.contains(\"Idiomorph.morph\"));\n-    assert!(body.contains(\"demo-counter-panel\"));\n-    assert!(body.contains(\"Counter:\"));\n-\n-    let log_path = tmp.path().join(\"events.jsonl\");\n-    let log = std::fs::read_to_string(log_path).unwrap();\n-    assert!(log.contains(\"demo_counter_bumped\"));\n-}\n-\n #[tokio::test]\n async fn post_ui_record_vote_morphs_ranking_and_persists() {\n     let (addr, tmp) = start_test_server().await;\n@@ -90,8 +63,8 @@ async fn post_ui_record_vote_morphs_ranking_and_persists() {\n         port: 0,\n     };\n     let state = create_app_state(cfg).await;\n-    let mut group = state.group.write().await;\n-    let ranked = sorter2_server::ranking::ranked_items(&mut group, 10_000, 1e-8);\n+    let group = state.group.read().await;\n+    let ranked = sorter2_server::ranking::ranked_items_cached(&group);\n     assert_eq!(ranked.len(), 2);\n     assert_eq!(ranked[0].item.as_str(), \"alpha\");\n }\ndiff --git a/test/smoke.clj b/test/smoke.clj\nindex b332324743b58baf3fe96d7477353749f137feae..11887c48282088e140d823a88ba616f6325835b3 100644\n--- a/test/smoke.clj\n+++ b/test/smoke.clj\n@@ -26,7 +26,7 @@\n             false))))))\n \n (deftest http-smoke-against-running-server\n-  (testing \"build, start, healthz, home contains RPC demo\"\n+  (testing \"build, start, healthz, home contains main panels\"\n     (let [root (repo-root)\n           data-dir (.getAbsolutePath (doto (io/file (System/getProperty \"java.io.tmpdir\")\n                                                    (str \"sorter2-smoke-\" (System/currentTimeMillis)))\n","role":"user"}],"model":"openai/gpt-5.2-chat"}