feat(03-02): Task 1 — assertA30 page-side orchestrator (5 event triggers + SAVE)

- Add assertA30 dispatching 5 synthetic browser events on the harness page:
  click (#probe-submit), input (#probe-email),
  navigation (history.pushState #a30-probe), js_error (window.dispatchEvent
  ErrorEvent), network_error (fetch https://example.com/<404-path>).
- Module-local timing/url constants: A30_SAVE_ARCHIVE_TIMEOUT_MS=15s,
  A30_SEGMENT_SETTLE_MS=11s, A30_TRIGGER_SETTLE_MS=500ms,
  A30_404_PROBE_URL (RFC 2606 reserved example.com).
- Wire assertA30 into declare global Window.__mokoshHarness interface +
  window.__mokoshHarness object literal (preserves assertA29 from Plan 03-01).
- Update statusEl banner A29 -> A30 and closing console.log to append
  "Plan 03-02: A30".
- A30 rides production listeners at src/content/index.ts:60-237 + existing
  setupFreshRecording / sendMessageWithTimeout helpers — Tier-1
  FORBIDDEN_HOOK_STRINGS inventory unchanged at 12.

tests/uat/extension-page-harness.ts

@@ -3418,6 +3418,137 @@ async function assertA29(): Promise<AssertionResult> {
   return result;
 }
 
+/* ─── Plan 03-02 — A30 (event-log verification; SPEC §10 #5) ────────
+ *
+ *   A30 — REQ-user-event-log empirical: the production listeners at
+ *         src/content/index.ts (setupClickLogging at line 61,
+ *         setupInputLogging at line 77, setupNavigationLogging at line
+ *         99, setupErrorLogging at line 133, setupNetworkLogging at
+ *         line 164) all fire on synthetic browser events dispatched
+ *         on the harness page, producing UserEvent entries with each
+ *         of the 5 type-values (click / input / navigation /
+ *         js_error / network_error) in logs/events.json.
+ *
+ * Trigger strategy (all on the harness page; no new tabs opened):
+ *   - click: programmatic .click() on #probe-submit
+ *   - input: set #probe-email.value + dispatch Event('input', bubbles:true)
+ *   - navigation: history.pushState (intercepted at src/content/index.ts:121)
+ *   - js_error: window.dispatchEvent(new ErrorEvent('error', ...))
+ *   - network_error: fetch(404-probe-url).catch(noop) — production
+ *     fetch interception at src/content/index.ts:167 logs response.ok===false
+ *
+ * Page-side dispatches all 5 triggers + settles + SAVE. Host-side
+ * driveA30 JSZip-parses logs/events.json and asserts each of the 5
+ * UserEvent.type literal values is present.
+ *
+ * FORBIDDEN_HOOK_STRINGS impact: NONE. A30 rides production listeners
+ * + existing helpers. Tier-1 inventory stays at 12.
+ */
+
+/** SAVE_ARCHIVE dispatch timeout for A30 — matches A24/A25/A27/A29. */
+const A30_SAVE_ARCHIVE_TIMEOUT_MS = 15_000;
+/** Pre-SAVE segment-settle window (10s rotation + 1s slack). */
+const A30_SEGMENT_SETTLE_MS = 11_000;
+/** Settle between trigger dispatches and SAVE so event handlers complete. */
+const A30_TRIGGER_SETTLE_MS = 500;
+/** 404 probe URL — chrome.tabs perm grant is irrelevant; fetch happens
+ *  from the harness page realm. example.com is RFC 2606 reserved +
+ *  serves a 404 reliably for unknown paths under headless Chrome. */
+const A30_404_PROBE_URL = 'https://example.com/this-path-does-not-exist-404-probe-a30';
+
+/**
+ * A30 — Event-log empirical (SPEC §10 #5 / REQ-user-event-log).
+ *
+ * Dispatches 5 synthetic browser events that exercise each of the
+ * production listeners; runs setupFreshRecording so event-log
+ * cleanup hasn't dropped anything; settles a segment; SAVEs. Host-side
+ * driveA30 inspects logs/events.json from the produced zip and asserts
+ * each of the 5 UserEvent.type literal values appears at least once.
+ *
+ * @returns AssertionResult with 1 page-side check (SAVE ack); host-side
+ *          driveA30 appends 5 UserEvent.type presence checks.
+ */
+async function assertA30(): Promise<AssertionResult> {
+  const result: AssertionResult = {
+    passed: false,
+    name: 'A30 — event log captures 5 UserEvent types (SPEC §10 #5 / REQ-user-event-log)',
+    checks: [],
+    diagnostics: [],
+  };
+
+  try {
+    diag(result, 'Step 1: setupFreshRecording (A30 owns its recording — clean event-log window)');
+    const setupResp = await setupFreshRecording();
+    if (!setupResp.ok) {
+      throw new Error(`setupFreshRecording failed: ${setupResp.error ?? '(no error)'}`);
+    }
+    diag(result, 'Step 1 OK — REC state established');
+
+    diag(result, `Step 2: settle ${A30_SEGMENT_SETTLE_MS}ms for first segment rotation`);
+    await new Promise((r) => setTimeout(r, A30_SEGMENT_SETTLE_MS));
+
+    diag(result, 'Step 3: click trigger — programmatic .click() on #probe-submit');
+    const submitBtn = document.querySelector<HTMLButtonElement>('#probe-submit');
+    if (submitBtn !== null) {
+      submitBtn.click();
+    } else {
+      diag(result, 'Step 3 WARN — #probe-submit missing; click trigger skipped');
+    }
+
+    diag(result, 'Step 4: input trigger — set #probe-email.value + dispatch input event');
+    const emailInput = document.querySelector<HTMLInputElement>('#probe-email');
+    if (emailInput !== null) {
+      emailInput.value = 'a30@probe.local';
+      emailInput.dispatchEvent(new Event('input', { bubbles: true }));
+    } else {
+      diag(result, 'Step 4 WARN — #probe-email missing; input trigger skipped');
+    }
+
+    diag(result, 'Step 5: navigation trigger — history.pushState (production wrapper at src/content/index.ts:121 intercepts)');
+    history.pushState({}, '', window.location.pathname + '#a30-probe');
+
+    diag(result, 'Step 6: js_error trigger — window.dispatchEvent(ErrorEvent("error"))');
+    window.dispatchEvent(new ErrorEvent('error', {
+      message: 'a30-probe-js-error',
+      filename: 'a30-probe.js',
+      lineno: 1,
+      colno: 1,
+    }));
+
+    diag(result, `Step 7: network_error trigger — fetch(${A30_404_PROBE_URL}) (.catch noop)`);
+    try {
+      await fetch(A30_404_PROBE_URL);
+    } catch (fetchErr) {
+      diag(result, `Step 7 fetch threw (acceptable for network_error path): ${String(fetchErr)}`);
+    }
+
+    diag(result, `Step 8: settle ${A30_TRIGGER_SETTLE_MS}ms so async handlers (fetch.then) complete`);
+    await new Promise((r) => setTimeout(r, A30_TRIGGER_SETTLE_MS));
+
+    diag(result, 'Step 9: dispatch SAVE_ARCHIVE');
+    const ack = await sendMessageWithTimeout<{ success: boolean; error?: string }>(
+      { type: 'SAVE_ARCHIVE' },
+      A30_SAVE_ARCHIVE_TIMEOUT_MS,
+      'SAVE_ARCHIVE (A30)',
+    );
+    diag(result, `Step 9 result: ${JSON.stringify(ack)}`);
+
+    result.checks.push({
+      name: 'A30.1: SAVE_ARCHIVE ack received with success=true',
+      expected: true,
+      actual: ack.success,
+      passed: ack.success === true,
+    });
+
+    result.passed = result.checks.every((c) => c.passed);
+  } catch (err) {
+    result.error = err instanceof Error ? err.message : String(err);
+    diag(result, `THREW: ${result.error}`);
+  }
+
+  return result;
+}
+
 /**
  * Read `chrome.runtime.getManifest().version`. Used by the host-side
  * orchestrator at startup to capture the expected version for A13's
@@ -3471,6 +3602,8 @@ declare global {
       assertA28: () => Promise<AssertionResult>;
       // Plan 03-01 — rrweb DOM verification (SPEC §10 #4)
       assertA29: () => Promise<AssertionResult>;
+      // Plan 03-02 — event-log verification (SPEC §10 #5)
+      assertA30: () => Promise<AssertionResult>;
       getManifestVersion: () => Promise<string>;
     };
   }
@@ -3506,14 +3639,15 @@ window.__mokoshHarness = {
   assertA27,
   assertA28,
   assertA29,
+  assertA30,
   getManifestVersion,
 };
 
 const statusEl = document.getElementById('status');
 if (statusEl !== null) {
-  statusEl.textContent = 'Harness ready. window.__mokoshHarness.{assertA1..A29, getManifestVersion} available.';
+  statusEl.textContent = 'Harness ready. window.__mokoshHarness.{assertA1..A30, getManifestVersion} available.';
 }
 
-console.log('[harness-page] ready — window.__mokoshHarness installed (Plan 01-13 Task 9: A1..A14 + Plan 01-10 Wave 3: A15..A17 + Plan 01-12 Wave 6: A18..A22 + Plan 01-14: A23 + Plan 02-04 Tasks 1-2: A24+A25 + Plan 02-04 Task 3: A26+A27+A28 + Plan 03-01: A29 + getManifestVersion)');
+console.log('[harness-page] ready — window.__mokoshHarness installed (Plan 01-13 Task 9: A1..A14 + Plan 01-10 Wave 3: A15..A17 + Plan 01-12 Wave 6: A18..A22 + Plan 01-14: A23 + Plan 02-04 Tasks 1-2: A24+A25 + Plan 02-04 Task 3: A26+A27+A28 + Plan 03-01: A29 + Plan 03-02: A30 + getManifestVersion)');
 
 export {};