feat(FN-4360): complete Step 6 — document reliability metrics surface

Fusion-Task-Id: FN-4360
Fusion-Task-Lineage: 50e17cef-29b0-4adc-aa1c-bffdebe4b43c

.changeset/FN-4360-reliability-metrics.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Add a reliability metrics surface with `GET /api/health/reliability` and a new dashboard Reliability view showing in-review failure rate, duration percentiles, and merge-attempt distribution.

AGENTS.md

@@ -677,10 +677,10 @@ The test config (`vitest.config.ts`) includes `test.css: { include: [/.+/] }` so
 
 ### Lazy-Loaded Heavy Views
 
-These 16 views are lazy-loaded via `React.lazy()` to manage bundle size:
+These 17 views are lazy-loaded via `React.lazy()` to manage bundle size:
 
 - `AgentsView`, `NodesView`, `ChatView`, `MemoryView`
-- `DevServerView`, `InsightsView`, `DocumentsView`, `SkillsView`, `ResearchView`, `EvalsView`, `TodoView`, `StashRecoveryView`
+- `DevServerView`, `InsightsView`, `DocumentsView`, `SkillsView`, `ResearchView`, `ReliabilityView`, `EvalsView`, `TodoView`, `StashRecoveryView`
 - `SetupWizardModal`, `PluginManager`, `PiExtensionsManager`, `AgentDetailView`
 
 They are loaded in `App.tsx` / `AppModals.tsx` / `SettingsModal.tsx` / `AgentsView.tsx` with `<Suspense fallback={null}>`. 

docs/architecture.md

@@ -965,10 +965,13 @@ The run-audit system records every mutation performed by the engine across three
 
 Events are tied to specific run IDs for end-to-end traceability.
 
-**Run audit endpoint:**
+**Run audit endpoints:**
 - `GET /api/agents/:id/runs/:runId/audit` — Returns audit trail for a specific agent run
   - Query params: `?domain=database|git|filesystem` for filtering
   - Requires agent ownership or admin access
+- `GET /api/health/reliability` — Aggregates rolling reliability metrics from run-audit and task activity signals.
+  - Query params: `?windowDays=<1..30>` (default `7`)
+  - Response shape: `{ windowDays, generatedAt, headline, perDay, duration, mergeAttempts }` where missing instrumentation/samples surface as `null` with a `reason` field.
 
 ---
 

packages/dashboard/app/__tests__/lazy-loaded-views-docs.test.ts

@@ -12,6 +12,7 @@ const EXPECTED_DOCUMENTED_VIEWS = new Set([
   "DocumentsView",
   "SkillsView",
   "ResearchView",
+  "ReliabilityView",
   "EvalsView",
   "TodoView",
   "StashRecoveryView",
@@ -31,6 +32,7 @@ const EXPECTED_APP_LEVEL_VIEWS = new Set([
   "ChatView",
   "SkillsView",
   "MemoryView",
+  "ReliabilityView",
   "DevServerView",
   "TodoView",
   "StashRecoveryView",
@@ -57,18 +59,18 @@ function extractAppLazyViews(appSource: string): Set<string> {
 }
 
 describe("AGENTS lazy-loaded views inventory", () => {
-  it("documents the App-level lazy views accurately and keeps the curated 15-view list in sync", () => {
+  it("documents the App-level lazy views accurately and keeps the curated 17-view list in sync", () => {
     const agentsDoc = readFileSync(resolve(__dirname, "../../../../AGENTS.md"), "utf-8");
     const appSource = readFileSync(resolve(__dirname, "../App.tsx"), "utf-8");
 
     const section = extractLazyLoadedSection(agentsDoc);
     const countMatch = section.match(/These\s+(\d+)\s+views\s+are lazy-loaded/);
     expect(countMatch).toBeTruthy();
-    expect(Number(countMatch?.[1])).toBe(16);
+    expect(Number(countMatch?.[1])).toBe(17);
 
     const documentedViews = extractBacktickedNamesFromBullets(section);
     expect(new Set(documentedViews)).toEqual(EXPECTED_DOCUMENTED_VIEWS);
-    expect(documentedViews).toHaveLength(16);
+    expect(documentedViews).toHaveLength(17);
 
     expect(section).toContain("`ResearchView`");
     expect(section).toContain("`TodoView`");