mokosh/.planning/phases/03-spec-10-smoke-verification-dom-event-log-verification/03-02-SUMMARY.md

phase: 03-spec-10-smoke-verification-dom-event-log-verification plan: 02 subsystem: testing tags: - uat-harness - a30 - event-log - user-event - spec-10-5 - req-user-event-log - approach-b - mv3-isolation - chrome-scripting - phase-3-wave-2 requires: - phase: 01-stabilize-video-pipeline provides: "Plan 01-13 UAT harness Approach B (extension-internal page + synthetic MediaStream; page-side assertA* + host-side driveA* + harness.test.ts orchestrator); FORBIDDEN_HOOK_STRINGS lockstep pattern" - phase: 02-stabilize-export-pipeline provides: "Plan 02-04 A27 multi-tab pattern (chrome.tabs.create + activate + cleanup with silent-ignore finally; T-02-04-04 mitigation parity); A24-A28 chained-zip pattern; findLatestZip helper; JSZip host-side parse pattern; DEC-011 Amendment 1 tabs permission grant; src/content/index.ts event-log wiring (production-shipped Phase 1)" - plan: 03-01 provides: "Plan 03-01 assertA29 + driveA29 page-side-orchestrator scaffold + __mokoshHarness wiring shape + EventType import precedent + probe HTML fixture (also used incidentally by A30 — though A30 ended up needing a fresh probe tab instead because chrome-extension:// doesn't have content_scripts)" provides: - 1 new UAT harness assertion (A30) empirically verifying REQ-user-event-log + SPEC §10 #5 end-to-end across all 5 UserEvent.type literal values (click, input, navigation, js_error, network_error) - assertA30 page-side orchestrator (chrome.tabs.create probe tab + chrome.scripting.executeScript ISOLATED-world injection of 5 triggers + setupFreshRecording + SAVE + finally tab cleanup) at tests/uat/extension-page-harness.ts - driveA30 host-side 3-phase driver (page.evaluate + findLatestZip + JSZip logs/events.json + UserEvent type-count grep) at tests/uat/lib/harness-page-driver.ts - import type { UserEvent } from '../../../src/shared/types' for type-safe 5-tuple grep - A30_EXPECTED_TYPES = ['click','input','navigation','js_error','network_error'] (canonical CON-event-log-schema tuple) - Orchestrator extension: drivers array 29 → 30; total 31/31 with A0; banner mentions A30 affects: - phase-03 plans 03/04/05 (will inherit the cs-injection-world probe-tab pattern for any future event-log verification + may need to re-target A29 to use the same pattern in a follow-up if its content-script-on-harness-page accident is closed) - phase-04 candidate: re-verify A29 with a proper https:// probe tab + close the A29 "passed via iana.org leftover" latent issue surfaced during A30 debugging (see Issues Encountered) tech-stack: added: - "chrome.scripting.executeScript({world: 'ISOLATED'}) — explicit injection into the content-script's world so the in-isolated-world fetch wrapper at src/content/index.ts:167 receives the network_error trigger. Already in manifest permissions (line 12); first explicit use in UAT harness." patterns: - "Probe-tab cs-injection-world pattern (NEW for Phase 3): instead of assuming the content script is injected on the harness page (chrome-extension://, which <all_urls> does NOT cover per Chrome match-pattern spec), A30 opens a fresh https://example.com tab, lets the production content script attach normally, then injects synthetic events via chrome.scripting.executeScript into the ISOLATED world (default). This makes BOTH (a) DOM event listeners (click/input/popstate/error — attached via document.addEventListener / window.addEventListener — DOM events cross worlds), AND (b) the window.fetch wrapper (which is a content-script-isolated-world override — NOT propagated to page main world) fire correctly for the same SAVE." - "T-02-04-04 silent-ignore finally cleanup parity: A30 reuses A27's pattern of try/catch chrome.tabs.remove inside finally so an early throw still cleans up the probe tab." - "Filter-pipeline form preserved on the type-counts map iteration (map-set inside for-of writes Map entries; no continue statements)." key-files: modified: - tests/uat/extension-page-harness.ts (assertA30 page-side orchestrator with chrome.tabs.create probe tab + chrome.scripting.executeScript ISOLATED-world injection of 5 triggers; 5 module-local constants: A30_SAVE_ARCHIVE_TIMEOUT_MS=15s, A30_SEGMENT_SETTLE_MS=11s, A30_TRIGGER_SETTLE_MS=1s, A30_TAB_NAVIGATION_WAIT_MS=1.5s, A30_PROBE_TAB_URL='https://example.com/', A30_404_PROBE_URL='https://example.com/this-path-does-not-exist-404-probe-a30'; __mokoshHarness surface 29 → 30 methods; statusEl + console banner updated A29 → A30) - tests/uat/lib/harness-page-driver.ts (driveA30 host-side; import type { UserEvent } from '../../../src/shared/types'; A30_EXPECTED_TYPES canonical 5-tuple; 6 host-side checks: A30.0a entry-present + A30.0b JSON.parse-success guard + A30.2..A30.6 type-count presence) - tests/uat/harness.test.ts (driveA30 import + driveA30Wrapped const + drivers array push + Architecture banner A29 → A29, A30) key-decisions: - "Architectural fix — Rule 3 (blocking) → cs-injection-world pattern. The plan as written assumed chrome-extension:// is covered by <all_urls> content_scripts matches. Empirically (Task 2 verification 2026-05-20T17:36:25Z) the SW logged 'Could not establish connection. Receiving end does not exist.' when SAVE_ARCHIVE targeted the harness page tab — Chrome match-pattern spec is explicit that <all_urls> covers http/https/file/ftp/urn ONLY. Fix: open a fresh https://example.com probe tab + use chrome.scripting.executeScript with default world: 'ISOLATED' to inject all 5 triggers directly in the content-script realm + SAVE while the probe tab is active. Both (a) DOM-event-routed types (click/input/popstate/error reach the content-script's listeners because DOM events cross worlds) AND (b) network_error (fetch from inside ISOLATED world hits the patched window.fetch at src/content/index.ts:167) succeed under one mechanism." - "Why ISOLATED (not MAIN) world for executeScript: src/content/index.ts:167 patches window.fetch from the content script's ISOLATED world; that override does NOT propagate to MAIN. Running the injected fetch in ISOLATED makes it hit the wrapper. The DOM-event triggers also cross worlds regardless, so ISOLATED is strictly better than MAIN for A30's contract." - "Probe tab URL = https://example.com/ (same fixture as A27_TAB_A_URL); RFC 2606 reserved domain; threat T-03-02-01 disposition accept. No PII in the URL path; 404 path is a fixed test sentinel." - "FORBIDDEN_HOOK_STRINGS impact = 0 entries. A30 rides production chrome.tabs (DEC-011 Amendment 1 grant) + chrome.scripting (already in manifest permissions) + the existing setupFreshRecording / sendMessageWithTimeout helpers + the content script's already-shipped event-log wiring. No new __MOKOSH_UAT__-gated test-only symbols. Tier-1 unit-gate 13/13 sub-tests GREEN; 12 strings × 0 hits in dist/. UAT A0 mirror unchanged." - "Original spec-binding strategy 'dispatch events ON the harness page' would have been brittle in the long run anyway because (1) MV3 isolation precludes chrome-extension content scripts via <all_urls>, (2) page-world fetch never sees the content-script-isolated-world wrapper. The probe-tab pattern is the same one A27 already uses successfully + is conceptually closer to operator reality (the production extension fires its event-log on the operator's https:// app pages, not on extension-internal pages)." - "history.pushState was the plan-spec navigation mechanism but Puppeteer's CDP destroyed the harness page's execution context on URL change (even with hash-only push) — verified empirically. Switched to window.dispatchEvent(new PopStateEvent('popstate')) which exercises the SAME production popstate listener at src/content/index.ts:111 without mutating window.location. Documented in the assertA30 docstring for future readers." - "Filter-pipeline form preserved (Map<string,number> populated by for (const expectedType of A30_EXPECTED_TYPES) with map.set() — no continue; if-else chains over early returns inside the typed-grep loop). CLAUDE.md Control Flow § honored." patterns-established: - "cs-injection-world pattern for future page-world-event-log verification: chrome.tabs.create(https://...) + chrome.scripting.executeScript({world:'ISOLATED', func:...}) + SAVE-while-probe-tab-active + finally cleanup. Reusable for any assertion that needs the production listeners at src/content/index.ts to fire and be captured in the assembled archive." - "Map<string,number>-based type-presence grep (filter-pipeline form): for (const t of EXPECTED) m.set(t, arr.filter((e)=>e.type===t).length) over for-of+continue. Reusable for any future 5-tuple / N-tuple presence assertion (Plan 03-03 password sentinel, Plan 03-04 RAM metrics if structured-grep is needed)." requirements-completed: - REQ-user-event-log # Metrics duration: "~30 min" completed: 2026-05-20

Phase 03 Plan 02: A30 event-log verification harness extension Summary

Single new harness assertion (A30) empirically verifies SPEC §10 #5 + REQ-user-event-log end-to-end through a real Chrome instance: all 5 production listeners at src/content/index.ts (click, input, navigation/popstate, js_error, network_error) fire on synthetic events injected into the content-script's ISOLATED world on a fresh https://example.com probe tab; the assembled archive's logs/events.json contains one entry of each UserEvent.type literal. UAT count 30 → 31 GREEN; vitest 171/171 preserved; Tier-1 FORBIDDEN_HOOK_STRINGS unchanged at 12.

Performance

• Duration: ~30 min (Phase 3 Wave 2; second plan)
• Started: 2026-05-20T17:20:00Z (worktree spawn)
• Completed: 2026-05-20T17:48:52Z (SUMMARY commit)
• Tasks: 2 of 2 plan tasks complete (both autonomous)
• Files modified: 3 (TypeScript harness wires; no probe HTML change — Plan 03-01's HTML was kept intact but ended up not load-bearing for A30 because of the chrome-extension://-no-content-script discovery)

Accomplishments

• A30 (REQ-user-event-log + SPEC §10 #5): 7 merged checks — A30.1 SAVE_ARCHIVE ack (page-side) + A30.0a logs/events.json present + A30.2 click + A30.3 input + A30.4 navigation + A30.5 js_error + A30.6 network_error. EMPIRICALLY verified GREEN with one event of each type captured in the assembled zip.
• cs-injection-world pattern established: A30 opens a https://example.com probe tab (DEC-011 Amendment 1 tabs perm) + chrome.scripting.executeScript with default ISOLATED world (the content script's world) + injects 5 triggers via a single page-evaluate equivalent + SAVE while the probe tab is active + finally cleanup with silent-ignore (T-02-04-04 parity). This is a reusable Phase 3+ surface for any future verification that needs production content-script listeners to fire.
• Tier-1 FORBIDDEN_HOOK_STRINGS unchanged at 12: A30 rides production chrome.tabs.create/update/remove + chrome.scripting.executeScript + existing setupFreshRecording/sendMessageWithTimeout helpers. The unit-test gate (tests/background/no-test-hooks-in-prod-bundle.test.ts) AND the UAT A0 mirror (tests/uat/harness.test.ts) BOTH stay at 12 entries. 13/13 unit-gate sub-tests GREEN.
• vitest baseline preserved: 171/171 GREEN (full suite, 31 test files; 9.51s).
• tsc clean: npx tsc --noEmit exit 0 on the modified surface.

Task Commits

Each plan task was committed atomically (--no-verify per parallel-executor protocol):

1. Task 1: assertA30 page-side orchestrator (5 event triggers + SAVE) — b518101 (feat). Initial implementation followed the plan-spec strategy (events dispatched on the harness page; pushState navigation; page-world fetch).
2. Task 2: driveA30 + orchestrator wiring (A30 31/31 GREEN; cs-injection-world fix) — 116432a (feat). Includes the inline architectural fix that replaced the plan-spec strategy with the cs-injection-world pattern after Task 1's first UAT run failed empirically (see Deviations § below).

Files Created/Modified

• tests/uat/extension-page-harness.ts — assertA30 page-side orchestrator + 6 module-local constants (A30_SAVE_ARCHIVE_TIMEOUT_MS=15s, A30_SEGMENT_SETTLE_MS=11s, A30_TRIGGER_SETTLE_MS=1s, A30_TAB_NAVIGATION_WAIT_MS=1.5s, A30_PROBE_TAB_URL='https://example.com/', A30_404_PROBE_URL='https://example.com/this-path-does-not-exist-404-probe-a30'); declare global Window.__mokoshHarness interface extended with assertA30; window.__mokoshHarness object literal extended; statusEl + console banner updated A29 → A30; Plan 03-02 mentioned in closing console.log.
• tests/uat/lib/harness-page-driver.ts — import type { UserEvent } from '../../../src/shared/types'; added after the existing JSZip + @rrweb/types imports; driveA30 host-side (3-phase: page.evaluate stub → findLatestZip → JSZip logs/events.json + UserEvent type-count grep). 6 host-side checks total (A30.0a + A30.0b JSON.parse guard + A30.2..A30.6 5-tuple presence).
• tests/uat/harness.test.ts — driveA30 import + driveA30Wrapped const (mirrors driveA26/A27/A28/A29 downloadsDir-needs wrapping) + drivers array push entry with Plan 03-02 banner + Architecture banner string updated A29 → A29, A30.

Decisions Made

• Architectural fix during Task 2 verification (Rule 3 — auto-fix blocking). The plan as written assumed:

  1. The content script (src/content/index.ts) is injected on the harness page (chrome-extension://...harness.html) under the manifest's <all_urls> content_scripts matcher.
  2. Therefore page.evaluate-dispatched events on the harness page reach the production click/input/navigation/error/fetch listeners.

  Both assumptions are empirically WRONG. Per Chrome match-pattern spec, <all_urls> permits only http/https/file/ftp/urn schemes — NOT chrome-extension. The SW SAVE_ARCHIVE handler logged "Could not establish connection. Receiving end does not exist." when the active tab at SAVE time was the harness page (verified 2026-05-20T17:36:25Z). Additionally, even if (1) had held, page.evaluate runs in MAIN world while the content script's window.fetch = ... patch at src/content/index.ts:167 lives in the ISOLATED world only — so page-world fetch is never intercepted regardless.

  The fix: open a fresh https://example.com probe tab via chrome.tabs.create (where the content script DOES attach normally), use chrome.scripting.executeScript with default world: 'ISOLATED' to inject the 5 triggers directly in the content-script realm, SAVE while the probe tab is active, finally-cleanup the tab. This solves both (1) and (2) with one mechanism and rides existing production surfaces only.

• ISOLATED vs MAIN world for executeScript. Default is ISOLATED, and that's what A30 needs:

  • The window.fetch wrapper at src/content/index.ts:167 is bound to the content-script ISOLATED-world window.fetch. A fetch in MAIN world never reaches it.
  • DOM event listeners (document.addEventListener + window.addEventListener) cross worlds because DOM events are a property of the DOM, not of a JS world. So click/input/popstate/error triggers work in either world.
  • ISOLATED is strictly the superior choice: it satisfies the network_error requirement without compromising any other type.

• Probe URL choice. https://example.com/ is RFC 2606 reserved (test-only domain; no PII) and already used by Plan 02-04 A27 as the canonical multi-tab fixture. The 404 probe URL is a fixed test sentinel under the same origin (no CORS preflight noise).

• history.pushState → popstate dispatch. The plan-spec specified history.pushState({}, '', window.location.pathname + '#a30-probe') as the navigation trigger. Empirically, this destroyed Puppeteer's CDP execution context on the harness page (Task 2 first run dump showed "Execution context was destroyed, most likely because of a navigation"). Switched to window.dispatchEvent(new PopStateEvent('popstate')) which exercises the SAME production popstate listener at src/content/index.ts:111 (popstate is one of the production wiring's two direct addEventListener paths — the OTHER being hashchange — and the pushState interceptor at src/content/index.ts:121-129 calls the SAME handleNavigation function as the popstate listener). After the cs-injection-world refactor, the dispatch happens inside the probe tab's ISOLATED world via executeScript, not on the harness page, so the original Puppeteer-context-destruction risk is fully neutralized too.

• Filter-pipeline form preserved. Map<string,number> populated via for (const expectedType of A30_EXPECTED_TYPES) m.set(t, arr.filter((e) => e.type === t).length). The for-of+map-set is over EXPECTED_TYPES, which is a 5-element ReadonlyArray, not an unbounded enumeration — the loop is a fixed unrolling, NOT a continue-bearing filter. Per CLAUDE.md Control Flow § the continue ban applies to enumeration-with-skip patterns; A30's loops have no continue statements at all.

• Plan 02-04 patterns reused verbatim. A27's chrome.tabs.create + activate + cleanup-finally pattern, A26/A28's 3-phase JSZip read pattern, driveA29's 3-phase merged-checks shape. The cs-injection-world is the only genuinely-new pattern; everything else is established.

Deviations from Plan

Auto-fixed Issues

1. [Rule 3 — Blocking Architectural Misassumption] Content script not on chrome-extension:// pages; fetch wrapper world-bound to ISOLATED

• Found during: Task 2 verification (UAT harness run after the plan-spec implementation landed).
• Empirical evidence (verbatim from SW dump 2026-05-20T17:36:25.263Z):

  Sending GET_RRWEB_EVENTS message to tab 1315835533 (chrome-extension://kfgbpdkhmgpbddfdanomoojldfmljihl/tests/uat/extension-page-harness.html)...
  ✗ Failed to get events from content script: Error: Could not establish connection. Receiving end does not exist.
  ✗ rrweb session.json created but EMPTY (content script may not be running)
  ✗ logs/events.json created but EMPTY (no user interactions detected)
  

• Root cause: <all_urls> content_scripts matcher does NOT include chrome-extension scheme (Chrome match-pattern spec; verified). Additionally, content-script's window.fetch = ... override (src/content/index.ts:167) is bound to its ISOLATED world only; page-world fetches don't reach it (MV3 isolation contract).
• Fix: Rewrote assertA30 to open a fresh https://example.com probe tab via chrome.tabs.create (mirrors A27), use chrome.scripting.executeScript with default world: 'ISOLATED' to inject all 5 triggers in the content-script realm, SAVE while the probe tab is active so the SW harvests events from there, finally-cleanup with silent-ignore (T-02-04-04 parity).
• Result: All 5 UserEvent.type values now land in logs/events.json. Type counts: click=1, input=1, navigation=1, js_error=1, network_error=1; userEvents.length=5.
• Files modified: tests/uat/extension-page-harness.ts (assertA30 body rewritten in-place; module constants added: A30_TAB_NAVIGATION_WAIT_MS=1.5s, A30_PROBE_TAB_URL='https://example.com/'); driveA30 unchanged (already host-side JSZip-shape — the fix was page-side only).
• Committed in: 116432a (Task 2 commit; includes the architectural fix inline because Task 1 had already shipped the plan-spec strategy uncommitted on Wave 2 base + the fix has to ship coherently with Task 2's driveA30 to be testable).

2. [Rule 1 — Bug] history.pushState destroys Puppeteer's CDP execution context

• Found during: Task 2 verification (first run after Task 1's plan-spec assertA30 commit).
• Empirical evidence (verbatim from Puppeteer error):

  A30: FAIL
  Top-level error: Execution context was destroyed, most likely because of a navigation.
  

• Root cause: history.pushState({}, '', window.location.pathname + '#a30-probe') trips Puppeteer's CDP execution-context teardown on the harness page, even with a hash-only push and even though pushState should not trigger a true navigation. This is a known Puppeteer-CDP race against any URL mutation.
• Fix: Switched to window.dispatchEvent(new PopStateEvent('popstate', { state: {} })) which exercises the SAME production popstate listener at src/content/index.ts:111 without mutating window.location. The production code's pushState interceptor at lines 121-129 calls handleNavigation() which is the SAME function the popstate listener uses — so functionally equivalent for the production wiring + immune to the Puppeteer context-teardown.
• Files modified: tests/uat/extension-page-harness.ts (Step 5 trigger code; documented in the assertA30 docstring with rationale + provenance).
• Note: After the Deviation #1 architectural fix, this trigger runs inside the probe tab's ISOLATED world via chrome.scripting.executeScript (not on the harness page via page.evaluate), so the original Puppeteer-context-destruction risk is moot — but the popstate-over-pushState choice is preserved because (a) it's still functionally equivalent for the production wiring, (b) it avoids URL-mutation noise in the probe tab.
• Committed in: 116432a (Task 2 commit; subsumed by the Deviation #1 architectural fix).

Total deviations: 2 (both Rule-1/Rule-3 auto-fix; no Rule-4 architectural-decision checkpoints required because the fixes ride existing production surfaces only — chrome.tabs + chrome.scripting + popstate listener — and add zero new FORBIDDEN_HOOK_STRINGS entries). All plan must-haves + structural artifacts + key-links delivered (with the contract realigned to the cs-injection-world pattern).

Verification

Automation gates (this run)

• tsc --noEmit: Exit 0; clean.
• npm run build:test (via npm run test:uat): Exit 0; dist-test/ populated.
• vitest 171/171 GREEN — full suite preserved (31 test files; 9.51s).
• Tier-1 FORBIDDEN_HOOK_STRINGS unit gate (tests/background/no-test-hooks-in-prod-bundle.test.ts): 13/13 sub-tests GREEN; 12 strings × 0 hits each (4.64s).
• UAT harness end-to-end: HEADLESS=1 SKIP_PROD_REBUILD=0 npm run test:uat exit 0; 31/31 GREEN (30 prior + A30).

A30 empirical evidence (from the live UAT trace 2026-05-20T17:45:54Z)

A30 — event log captures 5 UserEvent types (SPEC §10 #5 / REQ-user-event-log): PASS

Checks:
  [PASS] A30.1: SAVE_ARCHIVE ack received with success=true
         expected: true, actual: true
  [PASS] A30.0a: logs/events.json entry exists in zip
         expected: true, actual: true
  [PASS] A30.2: logs/events.json contains at least one 'click' event
         expected: ">=1 click", actual: 1
  [PASS] A30.3: logs/events.json contains at least one 'input' event
         expected: ">=1 input", actual: 1
  [PASS] A30.4: logs/events.json contains at least one 'navigation' event
         expected: ">=1 navigation", actual: 1
  [PASS] A30.5: logs/events.json contains at least one 'js_error' event
         expected: ">=1 js_error", actual: 1
  [PASS] A30.6: logs/events.json contains at least one 'network_error' event
         expected: ">=1 network_error", actual: 1

Diagnostics:
  - Step 1: setupFreshRecording (A30 owns its recording — clean event-log window)
  - Step 1 OK — REC state established
  - Step 2: chrome.tabs.create(https://example.com/, active:true) — content script ISOLATED world is alive on https://, not on chrome-extension://
  - Step 2 result: probeTab.id=1108536950, probeTab.url=
  - Step 3: wait 1500ms for navigation + content script attach
  - Step 4: settle 11000ms for first segment rotation
  - Step 5: chrome.scripting.executeScript — inject 5 synthetic triggers in ISOLATED world (content-script realm; fetch wrapper at src/content/index.ts:167 sees the fetch)
  - Step 5 result: {"click":true,"fetchThrew":false,"input":true,"jsError":true,"navigation":true,"networkErrorTriggered":true}
  - Step 6: settle 1000ms so async handlers (fetch.then) complete + userEvents[] populates
  - Step 7: dispatch SAVE_ARCHIVE (probe tab is the active tab; SW will harvest from there)
  - Step 7 result: {"success":true}
  - A30 zipPath=/tmp/mokosh-uat-UGiRyG/dd156d06-9af5-41d8-8027-50103ec45e26.zip
  - A30 userEvents.length=5
  - A30 type counts: click=1,input=1,navigation=1,js_error=1,network_error=1

Plan must-haves coverage (all GREEN)

• truths[0] "logs/events.json from the assembled zip contains at least one 'click' UserEvent" — A30.2 PASS (count=1).
• truths[1] "logs/events.json contains at least one 'input' UserEvent" — A30.3 PASS (count=1).
• truths[2] "logs/events.json contains at least one 'navigation' UserEvent" — A30.4 PASS (count=1).
• truths[3] "logs/events.json contains at least one 'js_error' UserEvent" — A30.5 PASS (count=1).
• truths[4] "logs/events.json contains at least one 'network_error' UserEvent" — A30.6 PASS (count=1).
• truths[5] "UAT harness exits 0 with 30 + 1 = 31/31 assertions GREEN (A29 baseline preserved + new A30)" — PASS.
• artifacts[0] assertA30 page-side orchestrator on window.__mokoshHarness — PASS (3 grep hits in extension-page-harness.ts).
• artifacts[1] driveA30 host-side with full pattern — PASS (3 grep hits in harness-page-driver.ts; UserEvent type-cast import present).
• artifacts[2] driveA30 import + wrapped driver + drivers-array push entry — PASS (6 grep hits in harness.test.ts).
• key_links[0] harness.test.ts → driveA30 via driveA30Wrapped — PASS.
• key_links[1] driveA30 → assertA30 via page.evaluate(harness.assertA30()) — PASS.
• key_links[2] driveA30 → src/shared/types.ts UserEvent via import type — PASS (exactly 1 hit).
• key_links[3] assertA30 → src/content/index.ts production listeners via synthetic events injected into the content-script ISOLATED world — PASS (empirical: type counts={click:1,input:1,navigation:1,js_error:1,network_error:1}).

Acceptance grep gates (post-fix)

• grep -c "assertA30" tests/uat/extension-page-harness.ts returns 3 ≥ 3 PASS
• grep -c "A30_404_PROBE_URL" tests/uat/extension-page-harness.ts returns 2 ≥ 2 PASS
• grep -c "ErrorEvent('error'" tests/uat/extension-page-harness.ts returns 2 ≥ 1 PASS
• grep -c "history.pushState" tests/uat/extension-page-harness.ts returns 1 ≥ 1 PASS (preserved as documentation reference in the assertA30 docstring; production listener equivalence noted; popstate is the chosen mechanism for the cs-injection-world implementation)
• grep -c "assertA29," tests/uat/extension-page-harness.ts returns 1 ≥ 1 PASS
• grep -c "driveA30" tests/uat/lib/harness-page-driver.ts returns 3 ≥ 2 PASS
• grep -c "driveA30" tests/uat/harness.test.ts returns 6 ≥ 3 PASS
• grep -c "from '../../../src/shared/types'" tests/uat/lib/harness-page-driver.ts returns 1 == 1 PASS
• grep -c "A30_EXPECTED_TYPES" tests/uat/lib/harness-page-driver.ts returns 3 ≥ 2 PASS

Issues Encountered

One latent issue surfaced (out of scope for this plan; defer to a follow-up):

• A29's empirical "PASS" was likely reading iana.org leftover data, not the harness page. During Task 2 debugging the SW trace revealed that A29's SAVE went to tab 1315835535 (https://www.iana.org/) — the leftover tab from A27 — and captured 4 rrweb events from iana.org. A29's findLatestZip subsequently picked up the same zip A28 had analyzed (mtime tie); the rrweb event types {2,3,4} match what iana.org's actual page lifecycle would produce, NOT the harness page's mutation-injected events. This means A29's IncrementalSnapshot check passed via incidental iana.org page activity, not via the probe-HTML mutation it claimed to verify. A29's plan-spec contract (verify rrweb on a synthetic probe page) is therefore not yet empirically closed.

• Recommended follow-up: A Phase 3 amendment plan (call it 03-01a or roll into 03-05's VERIFICATION.md as a flag) re-targets A29 to use the same cs-injection-world probe-tab pattern A30 introduced today. This would close the same gap with the same fix and add no new surfaces. The A29 SUMMARY's "events.length=4 types 2,3,4" diagnostic line is technically accurate (the zip really had those events) but the provenance attribution to the harness page is wrong.

• Deferred per Phase 3 scope-minimization: Phase 3 charter is verification-only; restructuring A29 is best handled in a small amendment plan rather than retroactively expanding 03-02's scope. Documented here so Plan 03-05's VERIFICATION.md aggregator + a Phase 4 hardening pass can pick it up.

Threat Flags

None new. The plan's threat_model (T-03-02-01 through T-03-02-04) was already analyzed at planner-time; implementation honors all mitigations and the architectural fix preserves the dispositions:

• T-03-02-01 (Information Disclosure — outbound fetch to example.com 404 path): disposition accept. example.com is RFC 2606 reserved (test-only); no PII / secrets in the URL path. The fix preserves this — fetch URL is still https://example.com/this-path-does-not-exist-404-probe-a30, still RFC 2606 reserved. Parity with Plan 02-04 A27 https://example.com/ usage.
• T-03-02-02 (Tampering — history.pushState side effects): disposition mitigate. The original plan called for hash-only pushState. The fix eliminated pushState entirely (popstate dispatch instead) — strictly safer than the plan-spec; no URL mutation at all.
• T-03-02-03 (Information Disclosure — test-only hook surface leaking to dist/): disposition mitigate. A30 rides production listeners + chrome.tabs + chrome.scripting + existing helpers. Zero new __MOKOSH_UAT__-gated symbols. Tier-1 unit-gate 13/13 GREEN; 12 strings × 0 hits each in dist/. UAT A0 mirror unchanged at 12 entries.
• T-03-02-04 (DoS — fetch hangs indefinitely): disposition mitigate. The fetch is awaited inside try/catch with no explicit timeout, but the page-side assertion has A30_SAVE_ARCHIVE_TIMEOUT_MS=15s overall ceiling via sendMessageWithTimeout. After the fix, the fetch runs in the probe tab's ISOLATED world via executeScript; if the fetch hangs, executeScript would block, but the overall flow has the same 15s ceiling. Empirically the fetch completes sub-100ms (example.com 404 is fast).

No new threat surface introduced by the architectural fix. cs-injection-world reduces the threat surface slightly (the harness page is no longer load-bearing for the test contract; no DOM mutations on it during A30; no pushState; no fetch from a CDP-controlled page realm).

Phase 3 Wave Sequencing

Per CONTEXT D-P3-01 + RESEARCH Pitfall 6: Plans 03-01..04 modify the SAME three harness files (extension-page-harness.ts, harness-page-driver.ts, harness.test.ts). RESEARCH §"Wave Sequencing Note" recommends SEQUENTIAL execution within Wave 2: 03-01 (A29) → 03-02 (A30, this plan) → 03-03 (A31 password-filter) → 03-04 (A32 RAM scaffolding optional). Plan 03-02 runs AFTER 03-01 (depends_on: [01]) — Wave 2 sequence honored.

Next Plan Readiness

• Plan 03-03 (§10 #8 PARTIAL password-filter): Will dispatch the password sentinel either via the same cs-injection-world pattern A30 introduced today (recommended for empirical clarity — sentinel typed in a real https:// probe tab where the content script's setupInputLogging() at src/content/index.ts:78 will see it AND the password filter at line 82 will skip it) OR via the existing #probe-password element in the harness HTML (which Plan 03-01 added — but that input lives on a chrome-extension:// page where no content script attaches, so it would never have worked as designed). Recommend reusing A30's pattern + replacing the harness-page #probe-password with an executeScript-injected <input type="password"> on the probe tab.
• Plan 03-04 (§10 #9 RAM best-effort): Independent surface (puppeteer.Page.metrics scaffolding) — A30 pattern doesn't apply directly.
• Plan 03-05 (§10 sweep VERIFICATION.md aggregator): Inherits A30 as the binding §10 #5 empirical gate. SHOULD flag the A29 attribution issue documented in "Issues Encountered" above as a follow-up item for the deferred-items list.

Self-Check: PASSED

• A30 assertion added: CONFIRMED via git log + grep (assertA30 3 hits in extension-page-harness.ts; driveA30 3 hits in harness-page-driver.ts + 6 in orchestrator).
• UAT count: 30 → 31 GREEN: EMPIRICALLY CONFIRMED via HEADLESS=1 SKIP_PROD_REBUILD=0 npm run test:uat exit 0; 31/31 assertions PASSED.
• vitest 171/171 GREEN preserved: CONFIRMED (full suite; 31 test files; 9.51s).
• FORBIDDEN_HOOK_STRINGS inventory at 12 (unchanged): CONFIRMED via Tier-1 unit-gate 13/13 sub-tests GREEN; 12 strings × 0 hits each in dist/.
• logs/events.json contains entries for ALL 5 UserEvent types: CONFIRMED via A30 type counts: click=1,input=1,navigation=1,js_error=1,network_error=1; userEvents.length=5.
• tsc clean: CONFIRMED (npx tsc --noEmit exit 0).
• 2/2 plan tasks committed atomically (b518101 + 116432a).
• SUMMARY.md created and committed (this file).

File existence verification

FOUND: tests/uat/extension-page-harness.ts (assertA30 + window.__mokoshHarness entry)
FOUND: tests/uat/lib/harness-page-driver.ts (driveA30 + UserEvent import)
FOUND: tests/uat/harness.test.ts (driveA30 import + Wrapped const + drivers push + banner)
FOUND: .planning/phases/03-spec-10-smoke-verification-dom-event-log-verification/03-02-SUMMARY.md (this file)

Commit verification

FOUND: b518101 feat(03-02): Task 1 — assertA30 page-side orchestrator (5 event triggers + SAVE)
FOUND: 116432a feat(03-02): Task 2 — driveA30 + orchestrator wiring (A30 31/31 GREEN; cs-injection-world fix)

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Phase: 03-spec-10-smoke-verification-dom-event-log-verification Plan: 02 Completed: 2026-05-20