perf: bound Today readiness latency (#441)

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-v73';
+const CACHE = 'stackchain-dashboard-shell-v74';
 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;

frontend/today-readiness.js

@@ -32,15 +32,19 @@
       const candidates = preferredIndex >= 0
         ? ordered.slice(preferredIndex).concat(ordered.slice(0, preferredIndex))
         : [preferred].concat(ordered);
-      const states = [];
-      for (const item of candidates) states.push({ item, ...(await classify(item)) });
+      const targetState = { item:preferred, ...(await classify(preferred)) };
       if (request !== generation) return 'superseded';
-      const targetState = states[0];
       if (targetState.status === 'ready') {
         pending = null;
         onOpen(action, preferred);
         return 'opened';
       }
+      const fallbackStates = await Promise.all(candidates.slice(1).map(async item => ({
+        item,
+        ...(await classify(item)),
+      })));
+      const states = [targetState, ...fallbackStates];
+      if (request !== generation) return 'superseded';
       const nextReadyState = states.slice(1).find(state => state.status === 'ready');
       pending = {
         action,

tests/test_later_sync.py

@@ -347,5 +347,5 @@ async def test_dashboard_syncs_every_later_change_and_exposes_account_status():
 def test_later_sync_ships_atomically_in_the_offline_shell():
     source = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/later-sync.js'" in source

tests/test_markdown_renderer.py

@@ -137,4 +137,4 @@ def test_markdown_work_bodies_are_mobile_safe_block_containers():
     assert ".markdown-content { min-width:0; max-width:100%; overflow-wrap:anywhere;" in css
     assert ".markdown-content pre { max-width:100%; overflow-x:auto;" in css
     assert ".markdown-content a { min-height:44px;" in css
-    assert "stackchain-dashboard-shell-v73" in worker
+    assert "stackchain-dashboard-shell-v74" in worker

tests/test_mobile_composer_integration.py

@@ -35,4 +35,4 @@ def test_offline_shell_contains_every_local_dashboard_runtime_asset():
     shell_assets = set(re.findall(r"BASE \+ '([^']+)'", worker.split("async function sessionCsrf", 1)[0]))
 
     assert local_assets <= shell_assets, f"Offline shell is missing: {sorted(local_assets - shell_assets)}"
-    assert "stackchain-dashboard-shell-v73" in worker
+    assert "stackchain-dashboard-shell-v74" in worker

tests/test_plan_today.py

@@ -232,6 +232,6 @@ async def test_plan_today_wires_cancel_back_and_success_through_overlay_history(
 def test_plan_today_controller_is_available_in_the_offline_shell():
     source = SERVICE_WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/plan-today.js'" in source
     assert "BASE + 'static/plan-today-preview.js'" in source

tests/test_service_worker.py

@@ -122,7 +122,7 @@ async function dispatchNotificationClick(route) {{
 def test_resumable_today_session_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/my-work.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/dashboard.css'" in source
@@ -131,7 +131,7 @@ def test_resumable_today_session_ships_in_a_new_offline_shell():
 def test_offline_review_next_ships_today_completion_atomically():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/today-completion.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
 
@@ -139,7 +139,7 @@ def test_offline_review_next_ships_today_completion_atomically():
 def test_duplicate_aware_capture_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/create-issue-sheet.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
 
@@ -147,14 +147,14 @@ def test_duplicate_aware_capture_ships_in_a_new_offline_shell():
 def test_exact_later_picker_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/later-picker.js'" in source
 
 
 def test_navigation_deadline_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/dashboard.css'" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/install-app.js'" in source
@@ -163,21 +163,21 @@ def test_navigation_deadline_ships_in_a_new_shell_cache():
 def test_today_convergence_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/today-sync.js'" in source
 
 
 def test_mobile_search_viewport_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/mobile-search-viewport.js'" in source
 
 
 def test_update_ownership_flow_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/update-ownership.js'" in source
 
 
@@ -358,7 +358,7 @@ def test_one_session_bound_csrf_proof_is_reused_for_a_background_drain():
 def test_queue_today_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/queue-today.js'" in source
 
 

tests/test_today_readiness.py

@@ -18,23 +18,59 @@ def run_node(script):
     ).stdout
 
 
-def test_readiness_opens_ready_target_without_showing_a_gate():
+def test_readiness_opens_ready_target_without_inspecting_the_rest_of_the_queue():
     script = f"""
 const createTodayReadiness = require({json.dumps(str(READINESS))});
 const calls = [];
+const inspections = [];
 const item = (number, kind='issue') => ({{kind, repository:'stackchain/dashboard', number, title:'Item ' + number}});
 const readiness = createTodayReadiness({{
-  inspect: async candidate => ({{available:true, dependencies:[]}}),
+  inspect: async candidate => {{ inspections.push(candidate.number); return {{available:true, dependencies:[]}}; }},
   onOpen: (action, candidate) => calls.push(['open', action, candidate.number]),
   onGate: state => calls.push(['gate', state.status]),
 }});
-readiness.run('start', [item(1), item(2)]).then(result =>
-  process.stdout.write(JSON.stringify({{result, calls}}))
+readiness.run('start', [item(1), item(2), item(3)]).then(result =>
+  process.stdout.write(JSON.stringify({{result, calls, inspections}}))
 );
 """
     assert json.loads(run_node(script)) == {
         "result": "opened",
         "calls": [["open", "start", 1]],
+        "inspections": [1],
+    }
+
+
+def test_readiness_checks_fallbacks_concurrently_but_preserves_queue_order():
+    script = f"""
+const createTodayReadiness = require({json.dumps(str(READINESS))});
+const items = [1, 2, 3].map(number => ({{kind:'issue', repository:'r', number}}));
+const starts = [];
+const resolvers = {{}};
+const readiness = createTodayReadiness({{
+  inspect: candidate => {{
+    starts.push(candidate.number);
+    if (candidate.number === 1) return Promise.resolve({{available:true, dependencies:[{{state:'open'}}]}});
+    return new Promise(resolve => {{ resolvers[candidate.number] = resolve; }});
+  }},
+  onOpen: () => undefined,
+  onGate: state => {{ globalThis.gated = state.nextReady.number; }},
+}});
+(async () => {{
+  const running = readiness.run('start', items);
+  await new Promise(resolve => setImmediate(resolve));
+  const startedTogether = starts.slice();
+  if (resolvers[3]) resolvers[3]({{available:true, dependencies:[]}});
+  resolvers[2]({{available:true, dependencies:[]}});
+  await new Promise(resolve => setImmediate(resolve));
+  if (!startedTogether.includes(3)) resolvers[3]({{available:true, dependencies:[]}});
+  const result = await running;
+  process.stdout.write(JSON.stringify({{result, startedTogether, gated:globalThis.gated}}));
+}})();
+"""
+    assert json.loads(run_node(script)) == {
+        "result": "gated",
+        "startedTogether": [1, 2, 3],
+        "gated": 2,
     }
 
 
@@ -135,7 +171,10 @@ async def test_dashboard_exposes_mobile_today_readiness_gate_and_runtime():
 
 
 def test_readiness_runtime_is_available_in_offline_shell():
-    assert "BASE + 'static/today-readiness.js'" in SERVICE_WORKER.read_text()
+    service_worker = SERVICE_WORKER.read_text()
+
+    assert "const CACHE = 'stackchain-dashboard-shell-v74';" in service_worker
+    assert "BASE + 'static/today-readiness.js'" in service_worker
 
 
 def test_mobile_readiness_gate_has_touch_safe_wrapping_actions():

tests/test_today_sync.py

@@ -86,7 +86,7 @@ sync.enqueue('add', 'issue:r:1:');
 def test_inflight_today_drain_ships_in_a_new_offline_shell():
     source = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v73" in source
+    assert "stackchain-dashboard-shell-v74" in source
     assert "BASE + 'static/today-sync.js'" in source