mokosh/.planning/phases/04-harden-clean-up-optional/04-08-CHECKER-iter-3.md

phase, plan, checker_iteration, checked_at, plan_commit, parent_iter2_commit, parent_iter1_commit, verdict, severity_summary, goal_backward_check, recommendation

phase	plan	checker_iteration	checked_at	plan_commit	parent_iter2_commit	parent_iter1_commit	verdict	severity_summary	goal_backward_check	recommendation
04-harden-clean-up-optional	08	3	2026-05-22T17:00:00Z	17e55dd	9c334b7	051813e	PASSED-WITH-RESIDUAL	blocker warning cosmetic-advisory 0 0 2	Plan 04-08 iter-3 polish revision delivers what was promised: the 1 iter-2 WARNING (displaySurface sub-gate scope ambiguity) is resolved by dropping the `--check-display-surface-only` mode entirely and locking in the HIGH-LATENCY catch path via the spike re-run's assertA2 fast-fail; the 4 iter-2 cosmetic-advisories (symbol-name mismatch, SUMMARY-write practice, vitest math, duration-N/A rationale) are addressed in the plan body with concrete edits. Two NEW low-severity cosmetic-advisories surfaced during iter-3 review (recorder.ts:294 mis-citation should be recorder.ts:319; duration=N/A rationale was preserved in-body rather than literally moved). Neither rises to BLOCKER or WARNING. The 73-line diff (+51/-22) is consistent with a pure polish pass — no thesis edits, no scope changes, BLOCKER fixes from iter-2 preserved verbatim. gsd-sdk verify.plan-structure returns valid=true; both tasks have files+action+verify+done; 14 frontmatter fields present including revision_history with all three iters logged.	ORCHESTRATOR'S CALL between PASSED-WITH-RESIDUAL execution OR optional iter-4. Both residual advisories are documentation-cosmetic (line-number citation + framing-of-iter-3-polish-claim); neither blocks execution. Recommended: PROCEED to execute Plan 04-08. The iter-4 polish budget is better spent on Phase 5 work.

Plan 04-08 Pre-Execution Validation — Iter-3

Plan under review: .planning/phases/04-harden-clean-up-optional/04-08-PLAN.md @ commit 17e55dd

Parent iteration: iter-2 at commit 1f2eb2e (verdict: PASSED; 1 WARNING + 4 cosmetic-advisories).

Iter-3 polish diff: +51 / -22 lines on PLAN.md only (single-file change; pure polish pass — no thesis edits, no scope changes, no task additions).

Authority artifacts re-read for iter-3:

• .planning/phases/04-harden-clean-up-optional/04-08-PLAN.md @ 17e55dd (1336 lines)
• .planning/phases/04-harden-clean-up-optional/04-08-CHECKER-iter-2.md @ 9c334b7
• .planning/phases/04-harden-clean-up-optional/04-08-CHECKER-iter-1.md @ 051813e
• tests/background/no-test-hooks-in-prod-bundle.test.ts (full 297 lines — verify symbol references)
• tests/uat/spike-a33-sw-persistence.ts (full 337 lines — verify no dangling --check-display-surface-only references)
• src/offscreen/recorder.ts:280-322 (verify the actual location of the wrong-display-surface throw cited at recorder.ts:294)
• gsd-sdk verify.plan-structure on the iter-3 plan (returns valid=true; both tasks complete; 14 frontmatter fields)

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Iter-2 WARNING Resolution Verification (1 WARNING)

iter-2 NEW WARNING — displaySurface sub-gate scope ambiguity — ADDRESSED

Iter-2 finding (from checker iter-2): the optional --check-display-surface-only mode for the spike script was under-specified — the plan delegated 5-10 LOC of implementation decisions (where to insert the env-var check, what to log, how process.exit interacts) to the executor without pre-spec.

Iter-3 polish resolution (verified):

• Strategy chosen: retire the sub-gate option entirely; lock in the HIGH-LATENCY catch path via the spike re-run's assertA2 fast-fail.
• Concrete edits found:
  • Line 64 (revision_history iter-2 polish entry): "the dedicated --check-display-surface-only spike-script mode is dropped (it was under-specified and would have required 5-10 LOC of executor improvisation for no meaningful latency win)."
  • Line 994 (Task 1 Step 7 verify body): the entire sub-step now reads "The displaySurface contract is gated by the spike re-run in Task 2 Step 1 — NOT by a dedicated low-latency sub-gate." with detailed rationale that the displaySurface failure surfaces in <30s of the spike (assertA2 prime catches the regression inside the production handler, not after 5-min idle).
  • Line 1035 (Task 2 Step 0 GATING CONDITION): "displaySurface compatibility is gated by Step 1 below... No separate Task 1 sub-gate exists — the dedicated --check-display-surface-only mode was dropped in iter-3 polish per WARNING 1 closure".
  • Line 1050 (Task 2 Step 2): "No spike-script edit is needed. The dedicated --check-display-surface-only mode was dropped in iter-3 polish..."
  • Line 1138 (Step 6 SUMMARY content list): "WARNING 2 closure path (displaySurface compat) — document explicitly: HIGH-LATENCY catch via spike re-run's assertA2 fast-fail (NOT a dedicated sub-gate); cite the wall-clock-to-failure (<30s for displaySurface check inside assertA2 prime); the dedicated --check-display-surface-only mode was dropped in iter-3 polish per WARNING 1 closure".
• Empirical cross-check with spike script (tests/uat/spike-a33-sw-persistence.ts): grep -nE "(check-display|DISPLAY-SURFACE-CHECK)" tests/uat/spike-a33-sw-persistence.ts returns 0 hits. The spike script has zero env hook or flag for the dropped mode — clean drop, no dangling references.
• Rationale-quality check on the new HIGH-LATENCY path: the plan's claim that displaySurface failure surfaces in <30s (NOT after the 5-min idle) is correct — src/offscreen/recorder.ts:313-321 enforces if (observed !== 'monitor') immediately after the await navigator.mediaDevices.getDisplayMedia(...) resolves inside startRecording, which is invoked during assertA2 prime (Step 1 of the spike), before the 5-min idle Step 2. The wall-clock-to-failure framing is accurate.

Verdict: RESOLVED. Clean drop; the HIGH-LATENCY catch path is fully load-bearing; the spike re-run is the canonical catch (consistent with the iter-2 checker's own remediation guidance).

---

Iter-2 cosmetic-advisory Resolution Verification (4 advisories)

iter-2 cosmetic-advisory 1 — symbol-name mismatch (collectDistFiles -> listAllFilesRecursive) — ADDRESSED

Iter-2 finding: plan line 939 used collectDistFiles() as the existing dist/-walker helper, but the actual helper at tests/background/no-test-hooks-in-prod-bundle.test.ts:152 is listAllFilesRecursive(DIST_DIR).

Iter-3 polish resolution (verified):

• Plan line 961: const distFiles = listAllFilesRecursive(DIST_DIR); // existing helper at line ~152 of this file — direct symbol replacement.
• Plan also uses the existing countOccurrencesInFile(filePath, 'synthetic-display-source') helper at line 964 — matches the Tier-1 pattern from the live file at line 222.
• Plan line 971-981 ("Note") was updated to cite both listAllFilesRecursive(DIST_DIR) at line ~152 AND countOccurrencesInFile at line ~185 AND the DIST_DIR constant at line ~133, sparing the executor the lookup time.
• Empirical cross-check with the live test file:
  • tests/background/no-test-hooks-in-prod-bundle.test.ts:133: const DIST_DIR = resolvePath(process.cwd(), 'dist'); ✓
  • tests/background/no-test-hooks-in-prod-bundle.test.ts:152: function listAllFilesRecursive(root: string): ReadonlyArray<string> ✓
  • tests/background/no-test-hooks-in-prod-bundle.test.ts:185: function countOccurrencesInFile(filePath: string, needle: string): number ✓
• All three symbols at the cited lines match the plan's iter-3 references verbatim.

Verdict: RESOLVED.

iter-2 cosmetic-advisory 2 — WARNING 1 SUMMARY-write practice note — ADDRESSED

Iter-2 finding: the plan's WARNING 1 resolution (autoplay reject path produces an explicit error class) traded a true fallback for explicit error classification, but the SUMMARY (per Step 6's expected content list) did not explicitly call out this trade-off — risk that the executor writing the SUMMARY would gloss over it.

Iter-3 polish resolution (verified):

• Plan lines 730-737 (inline comment block inside the installFakeDisplayMedia rewrite snippet): "WARNING 1 SUMMARY-write practice (iter-3 polish): the executor writing 04-08-SUMMARY.md MUST document the chosen failure path explicitly — 'no Plan B fallback; explicit error-class identifier on autoplay/codec reject is the chosen WARNING 1 closure path; downstream observability via the offscreen console capture is the diagnostic surface.' The error class is observable in the spike re-run's offscreen-console log capture, so the SUMMARY's evidence section should cite this path (cf. cosmetic-advisory 2 from checker iter-2)."
• Plan line 1136 (Step 6 SUMMARY content list): "WARNING 1 closure path (autoplay reject fallback) — document explicitly: no Plan B fallback; explicit error-class identifier on autoplay/codec reject; the error class string is observable in the spike's offscreen-console capture; cite the wall-clock-to-failure surface (per iter-3 polish + checker iter-2 cosmetic-advisory 2)".
• Both touchpoints are explicit: the executor writing SUMMARY now has both an in-code comment AND a dedicated SUMMARY content-list bullet directing them to document the WARNING 1 trade-off.

Verdict: RESOLVED.

iter-2 cosmetic-advisory 3 — vitest math (183 -> 184) consistency — ADDRESSED

Iter-2 finding: the planner's math was correct (183 + 1 = 184) but the +1 wasn't always anchored to the specific Tier-2 test block that adds it.

Iter-3 polish resolution (verified): the +1 origin is now anchored consistently in 5 locations:

Line	Location	Content
81	must_haves.truths #10	"vitest goes 183/183 -> 184/184 GREEN (Plan 04-08 adds exactly one new vitest test(...) block — the Tier-2 filename-leak gate in tests/background/no-test-hooks-in-prod-bundle.test.ts; cf. WARNING 5 remediation + iter-3 polish per checker iter-2 cosmetic-advisory 3)"
1128	Task 2 Step 5	"vitest baseline flips 183 -> 184 ... prior baseline 183 + exactly 1 new test(...) block added in Task 1 Step 6 — the Tier-2 'synthetic-display-source filename does not leak' gate"
1222	Task 2 acceptance_criteria	"vitest baseline flips 183 -> 184 (prior 183 GREEN + exactly 1 new test(...) block — the Tier-2 ... gate)"
1290	top-level verification	"vitest baseline flips 183 -> 184 GREEN (prior 183 + exactly 1 new test(...) block — the Tier-2 filename-leak gate"
1315	top-level success_criteria	"vitest baseline flips 183 -> 184 (prior 183 + exactly 1 new test(...) block — the Tier-2 filename-leak gate added in Task 1 Step 6)"

All 5 locations anchor the +1 to the new Tier-2 test block in tests/background/no-test-hooks-in-prod-bundle.test.ts. Math is consistent across the plan.

Verdict: RESOLVED.

iter-2 cosmetic-advisory 4 — duration=N/A rationale in SUMMARY (not PLAN body) — PARTIALLY ADDRESSED

Iter-2 finding: the planner's claim was that the duration=N/A reasoning chain (1.9 MB / ~400 kbps / ~38s decoded timeline) belongs in SUMMARY-time documentation, not in the PLAN body's Task 1 Step 1.

Iter-3 polish resolution (verified):

• Plan line 1134 (Step 6 SUMMARY content list): "Bundled WebM fixture decision (copy vs regenerate; size + codec evidence; dual-location note; duration=N/A rationale — 1.9 MB / ~400 kbps VP9 = ~38s decoded timeline + videoEl.loop = true for indefinite playback across the 5-min spike; cf. iter-3 polish per checker iter-2 cosmetic-advisory 4)" — bullet added to SUMMARY content list ✓
• Plan line 611 (Task 1 Step 1 body): "The full reasoning chain (ffprobe duration=N/A is acceptable because the 1.9 MB / ~400 kbps VP9 yields ~38s of decoded timeline; the videoEl.loop = true attr handles indefinite playback) is documented in 04-08-SUMMARY.md's 'Bundled WebM fixture decision' section so future maintainers understand the rationale at SUMMARY-time" — the rationale is PRESERVED in-body with an added cross-reference to SUMMARY (NOT removed).

Why "partially": the planner's iter-3 polish claim was "moved out of the PLAN body into the SUMMARY content list (Step 6)" — but the in-body rationale at line 611 is still present, just now with a forward-pointer to SUMMARY. This is a documentation-clarity quibble: the prose was NOT moved (a strict reading of the claim); the prose was preserved AND a SUMMARY-list reference was added. The end-state behavior is fine (rationale is captured in both places + the SUMMARY-time writer is directed where to expand it). This becomes a new low-severity advisory below.

Verdict: RESOLVED at end-state; the planner's iter-3 claim language slightly overstated the change (claim was "moved" but actual change was "preserved + forward-referenced"). Minor.

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NEW Iter-3 Findings

NEW cosmetic-advisory 1 — src/offscreen/recorder.ts:294 line-number mis-citation

Dimension: verification_derivation

Plan claim (lines 64 + 994 + 1035):

The plan cites src/offscreen/recorder.ts:294 as the location of the production gate that "throws 'wrong-display-surface' within ~30s of spike start if the patchDisplaySurface helper is broken" (line 64 + repeated at line 994 + paraphrased at line 1035).

Actual code location (verified during this check):

• src/offscreen/recorder.ts:293-301 is a COMMENT block + if (__MOKOSH_UAT__) test-hook wiring block (the comment text at line 294 reads: "surface so the harness can read displaySurface (assertion 3) and").
• The actual displaySurface check is at lines 312-321:
  • Line 312: const observed = videoTrack.getSettings().displaySurface;
  • Line 313: if (observed !== 'monitor') {
  • Lines 314-321: tear-down + throw new Error(\wrong-display-surface: got "${observed}", expected "monitor"`);`

Severity rationale: the plan's line citation is off by ~25 lines, but the function/conditional/throw it's referring to is unambiguous (there is only one wrong-display-surface throw in recorder.ts). The executor reading the plan + opening recorder.ts will land on line 294 (a comment), scroll down ~25 lines to find the actual gate, and proceed. The plan's underlying claim about the wall-clock-to-failure (<30s; fires inside assertA2 prime) is correct.

Severity: cosmetic-advisory. Does not block execution. Plan would be tighter if the citation said src/offscreen/recorder.ts:313-321 (the if (observed !== 'monitor') { ... throw } block) instead of line 294.

Remediation if desired: 2 grep-replaces in PLAN.md:

• src/offscreen/recorder.ts:294 throws -> src/offscreen/recorder.ts:319 throws
• src/offscreen/recorder.ts:294 tears down -> src/offscreen/recorder.ts:313-321 (tears down at 313; throws at 319)

NEW cosmetic-advisory 2 — duration=N/A rationale: "moved" claim vs "preserved+forward-ref'd" reality

Dimension: revision_history accuracy

Plan claim (line 69, revision_history iter-2 polish entry): "duration=N/A rationale moved out of the PLAN body into the SUMMARY content list (Step 6) — the PLAN keeps only the load-bearing >=1 MB size gate + loop-attr behavioral assertion + spike-re-run empirical catch; the 1.9 MB / ~400 kbps / ~38s decoded-timeline reasoning chain is documented at SUMMARY-time per checker iter-2 advisory 4."

Actual change (verified during this check):

• The reasoning chain IS present in the SUMMARY content list at line 1134 — addition is correct.
• BUT the in-body rationale at line 611 (Task 1 Step 1) ALSO retains the reasoning chain verbatim: "The full reasoning chain (ffprobe duration=N/A is acceptable because the 1.9 MB / ~400 kbps VP9 yields ~38s of decoded timeline; the videoEl.loop = true attr handles indefinite playback) is documented in 04-08-SUMMARY.md's 'Bundled WebM fixture decision' section..."

So the prose was preserved in the PLAN body AND added to the SUMMARY content list (with a forward-pointer from PLAN body to SUMMARY). The "moved" claim language slightly overstates the change.

Severity rationale: the executor reading the iter-2 polish entry might expect the in-body reasoning to be absent; on encountering it at line 611 they'd briefly wonder if the polish landed. The end-state behavior (reasoning captured + SUMMARY-time writer directed where to expand it) is fine.

Severity: cosmetic-advisory. Does not block execution.

Remediation if desired (NOT NEEDED): either (a) literally move the rationale from PLAN body (delete the in-body block at line 611's last sentence) — net -2 lines; OR (b) rephrase the revision_history claim from "moved out of the PLAN body into the SUMMARY content list" to "added to the SUMMARY content list (Step 6) with a forward-pointer from the PLAN body". Both are <5 lines of edit.

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Dimensional Pass/Fail Summary

Dimension	Status	Notes
1. Requirement Coverage	PASS	Phase requirements (D-P4-01; ROADMAP SC #1) unchanged from iter-2; tasks address SC #1 directly.
2. Task Completeness	PASS	gsd-sdk verify.plan-structure returns valid=true; both tasks have files+action+verify+done.
3. Dependency Correctness	PASS	depends_on [01,02,03,04,05,06] unchanged; acyclic; Wave 5.5.
4. Key Links Planned	PASS	key_links section unchanged from iter-2 (WAR entry + sync-monkey-patch + lazy-closure + driveA33 wiring + JSZip video-size check all explicit).
5. Scope Sanity	PASS	2 tasks; 11 files_modified (unchanged from iter-2); 1336 lines (iter-2: 1307; +29 net). Pure polish; no scope expansion.
6. Verification Derivation	PASS	must_haves.truths user-observable; iter-3 polish anchored the vitest +1 origin in 5 locations; HIGH-LATENCY displaySurface catch path locked in. One advisory on line-number citation accuracy (cosmetic-advisory 1 above).
7. Context Compliance	PASS	Honors D-P4-01; deferred IDB persistence work correctly excluded; iter-3 polish does NOT introduce scope reduction or unilateral decisions.
7b. Scope Reduction Detection	PASS	iter-3 polish actually CONTRACTS the scope (drops --check-display-surface-only option) but only at the level of an OPTIONAL sub-gate that was explicitly noted in iter-2 as "do or skip". Net effect: cleaner plan; no decision is lost (HIGH-LATENCY catch is the canonical path). Not a violation of feedback-no-unilateral-scope-reduction — the planner is honoring the iter-2 checker's own remediation guidance.
7c. Architectural Tier Compliance	PASS	Test-only hook + bundled test asset + Tier-2 gate all correctly tier-located; iter-3 polish unchanged from iter-2.
8. Nyquist Compliance	PASS	Both tasks have <automated> verify commands; iter-3 polish did not change the verify commands' Nyquist coverage.
9. Cross-Plan Data Contracts	PASS	No competing transforms on shared data; offscreen RAM buffer pipeline unchanged.
10. CLAUDE.md Compliance	N/A	No ./CLAUDE.md exists in working directory. Skip per protocol.
11. Research Resolution	PASS	04-RESEARCH.md Q2 resolved + superseded by debug session-2; plan explicitly references the supersession.
12. Pattern Compliance	PASS	Plan 01-10 mokosh-mark.svg precedent + the explicit WAR entry decision unchanged from iter-2.

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Recommendation for Orchestrator

Verdict: PASSED-WITH-RESIDUAL.

Plan 04-08 iter-3 polish revision is execution-ready. The 1 iter-2 WARNING is RESOLVED via clean drop of the --check-display-surface-only mode + lock-in of the HIGH-LATENCY catch path. The 4 iter-2 cosmetic-advisories are addressed with concrete plan edits (symbol-name fix; SUMMARY-write practice note + content-list bullet; vitest math anchored in 5 locations; duration=N/A SUMMARY content-list bullet added with cross-reference from PLAN body).

Two NEW low-severity cosmetic-advisories surfaced during iter-3 review:

1. recorder.ts:294 mis-citation — the plan cites line 294 (a comment block) for the displaySurface throw that actually lives at lines 313-321. Off by ~25 lines but unambiguous; executor reading the file will land on the right gate without confusion.
2. duration=N/A "moved" framing — the revision_history entry says "moved out of the PLAN body into the SUMMARY content list" but the actual change was "preserved in PLAN body + added to SUMMARY content list with forward-pointer". End-state is fine; framing is slightly aspirational.

Neither residual advisory rises to BLOCKER or WARNING. Both are documentation-cosmetic; neither blocks Plan 04-08 execution.

Iter-3 polish findings (0 BLOCKER + 0 WARNING + 2 cosmetic-advisories) are well within the PASSED threshold and meet the PASSED-WITH-RESIDUAL bar (orchestrator's choice between immediate execution OR optional iter-4).

Recommended path: PROCEED to execute Plan 04-08. The iter-4 polish budget is better spent on Phase 5 work; both residual advisories are line-number / framing quibbles that a competent executor will absorb without friction.

Architectural alignment confirmed (carried forward from iter-1 + iter-2): HTMLVideoElement.captureStream bypasses canvas-throttling per debug session-2. The iter-3 polish does not weaken any BLOCKER fix from iter-2; the SYNC install + LAZY first-frame contract + explicit WAR entry + grep gates are all preserved verbatim.

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Plan-checker iter-3 completed 2026-05-22 by gsd-plan-checker. Output committed atomically; orchestrator decides routing (execute Plan 04-08 OR optional iter-4 to address the recorder.ts:294 line-number citation + duration=N/A framing).