perf: bound Build my Today readiness checks (Closes #637)

frontend/dashboard.js

@@ -1466,6 +1466,9 @@
   }
 
   function closePlanToday(navigate = true) {
+    planTodayReadiness.cancel();
+    qs('#build-today-plan').disabled = false;
+    qs('#plan-today-build-status').textContent = '';
     if (navigate) {
       taskOverlayHistory.close();
       return;
@@ -1514,28 +1517,30 @@
     },
   });
 
+  const planTodayReadiness = createPlanTodayReadiness({
+    concurrency:3,
+    identity:item => todayWork.identity(item),
+    inspect:async item => {
+      if (item.kind !== 'issue') return { status:'ready' };
+      const detail = await inspectTodayDependencies(item);
+      if (!detail.available) return { status:'unverified' };
+      if (detail.dependencies.length) return {
+        status:'blocked', reason:detail.dependencies.length + ' open ' +
+          (detail.dependencies.length === 1 ? 'dependency' : 'dependencies'),
+      };
+      return { status:'ready' };
+    },
+  });
+
   async function buildTodayPlan() {
     const button = qs('#build-today-plan');
     const state = planToday.snapshot();
     const candidates = state.ids.map(id => planToday.item(id)).concat(planToday.candidates());
     button.disabled = true;
     qs('#plan-today-build-status').textContent = 'Checking readiness and fitting your highest-ranked work…';
-    const checks = await Promise.all(candidates.map(async item => {
-      const id = todayWork.identity(item);
-      if (item.kind !== 'issue') return [id, { status:'ready' }];
-      try {
-        const detail = await inspectTodayDependencies(item);
-        if (!detail.available) return [id, { status:'unverified' }];
-        if (detail.dependencies.length) return [id, {
-          status:'blocked', reason:detail.dependencies.length + ' open ' +
-            (detail.dependencies.length === 1 ? 'dependency' : 'dependencies'),
-        }];
-        return [id, { status:'ready' }];
-      } catch (_error) {
-        return [id, { status:'unverified' }];
-      }
-    }));
-    planToday.buildRecommendation(Object.fromEntries(checks));
+    const checks = await planTodayReadiness.run(candidates);
+    if (!checks) return;
+    planToday.buildRecommendation(checks);
     button.disabled = false;
     renderPlanToday();
   }

frontend/index.html

@@ -907,6 +907,7 @@
 <script src="static/comment-next.js"></script>
 <script src="static/update-reply-read-next.js"></script>
 <script src="static/plan-today.js"></script>
+<script src="static/plan-today-readiness.js"></script>
 <script src="static/plan-today-preview.js"></script>
 <script src="static/today-sync.js"></script>
 <script src="static/today-rollover.js"></script>

frontend/plan-today-readiness.js

@@ -0,0 +1,41 @@
+function createPlanTodayReadiness({ identity, inspect, concurrency = 3 }) {
+  const workerCount = Math.max(1, Math.floor(Number(concurrency) || 1));
+  let generation = 0;
+
+  async function run(items) {
+    const runGeneration = ++generation;
+    const candidates = Array.from(items || []);
+    const results = new Array(candidates.length);
+    let next = 0;
+
+    async function worker() {
+      while (next < candidates.length) {
+        const index = next;
+        next += 1;
+        const item = candidates[index];
+        let result;
+        try {
+          result = await inspect(item);
+        } catch (_error) {
+          result = { status:'unverified' };
+        }
+        results[index] = [identity(item), result];
+      }
+    }
+
+    await Promise.all(Array.from(
+      { length:Math.min(workerCount, candidates.length) },
+      () => worker(),
+    ));
+    if (runGeneration !== generation) return null;
+    return Object.fromEntries(results);
+  }
+
+  function cancel() {
+    generation += 1;
+  }
+
+  return { run, cancel };
+}
+
+if (typeof module !== 'undefined' && module.exports) module.exports = createPlanTodayReadiness;

frontend/service-worker.js

@@ -1,6 +1,6 @@
 const BASE = new URL('./', self.location.href).pathname;
 importScripts(BASE + 'static/background-issue-sync.js');
-const CACHE = 'stackchain-dashboard-shell-v94';
+const CACHE = 'stackchain-dashboard-shell-v95';
 const OFFLINE_LEASE_URL = new URL(BASE + '__offline-session-lease', self.location.origin).href;
 const OUTAGE_STATUSES = new Set([500, 502, 503, 504]);
 const NAVIGATION_TIMEOUT_MS = self.__STACKCHAIN_NAVIGATION_TIMEOUT_MS || 4000;
@@ -41,6 +41,7 @@ const SHELL = [
   BASE + 'static/comment-next.js',
   BASE + 'static/update-reply-read-next.js',
   BASE + 'static/plan-today.js',
+  BASE + 'static/plan-today-readiness.js',
   BASE + 'static/plan-today-preview.js',
   BASE + 'static/today-sync.js',
   BASE + 'static/today-rollover.js',