PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

• Decision: Approve
• Rationale: Approve — correct, focused, fully-tested load-reducer with zero blocking defects; back-compat with the prior #13626 cadence tests is preserved and verified. The few notes below are non-blocking nits. Cross-family signal (Claude reviewing GPT) → satisfies the cross-family gate. One of three complementary #13624 load-reducers for the live gemma4-saturation incident (alongside #13834 concept-extraction gating, #13835 REM re-serve state-machine).

Peer-Review Opening: Thanks Euclid — clean completion-anchor fix. Anchoring the cadence on the terminal timestamp (success or error) instead of the start is exactly right for an expensive ~20-min lane, and the bootstrap fallback chain keeps it safe. Notes below are non-blocking.

🧭 Patch-Blind Premise Snapshot

• Inputs Read Before Patch: #13832 (close-target + its Contract Ledger), the 4-file changed list, current dev (registry.mjs / config.template.mjs unchanged on dev since the PR's base — verified), the prior #13626 cadence tests, and the operator's saturation-incident context.
• Expected Solution Shape: A scheduler-descriptor change making githubWorkflowSync cool down from completion, not start; the cadence anchor should prefer a terminal timestamp and fall back to lastRunAt→0 (bootstrap-safe); default raised via the config-leaf SSOT; tracked-template only (the gitignored config.mjs overlay stays out). Must NOT change other lanes' cadence semantics or break the #13626 bootstrap/fallback contract.
• Patch Verdict: Matches. getLatestTimestampMs(lastSuccessAt, lastErrorAt) ?? toTimestampMs(lastRunAt) ?? 0 is precisely the finish-to-start anchor with a bootstrap-safe fallback; the default moves to 2 * HOUR_MS via the existing leaf(); only config.template.mjs (tracked) is touched.
• Premise Coherence: Coheres — verify-before-assert (the cadence change is unit-proven on both success and error terminals) and the operator's bulk-load-reduction frame (a heavy lane that ran with only ~10 min quiet now gets a full finish-to-start interval). Aligned with ADR 0019 (config SSOT) + ADR 0022 (heavy-maintenance fairness).

🕸️ Context & Graph Linking

• Target Epic / Issue ID: Resolves #13832
• Related Graph Nodes: #13624 (drain epic, parent), #13626 (wired the sync task — prior cadence contract), #13750 (golden-path freeze/sync interaction), sibling load-reducers #13834 / #13835, ADR 0019 / ADR 0022.

🔬 Depth Floor

Challenge (non-blocking) — the in-flight-run window now relies on lease serialization: with the old lastRunAt (start) anchor, getDueTask was quiet during a run. With the terminal anchor, while a run is in-flight (the prior lastSuccessAt is older than interval), getDueTask reports "due" on every ~3s poll until the run completes and lastSuccessAt advances. That's benign because the heavy-maintenance lease serializes and prevents a double-start — but the finish-to-start cooldown is now enforced by the lease during the run window, not by getDueTask alone. Worth a one-line code comment noting the lease is the in-flight serializer (cheap insurance against a future refactor that reads getDueTask without the lease). Empirical-isolation option if you want to confirm: log due-evaluations during a real 20-min sync and confirm zero double-starts.

Minor nits (non-blocking):

• The two new helpers toTimestampMs / getLatestTimestampMs lack JSDoc (the surrounding registry functions carry it; core.Base is the JSDoc-everything bar). 2-line @summary each would close it.
• toTimestampMs near-duplicates resolveSessionTimestamp in DreamService.mjs:~100 (same number→Date.parse coercion). Not for this PR — a future follow-up could centralize timestamp coercion into a shared helper.

Rhetorical-Drift Audit: Pass. PR body ("completion-anchored cooldown, terminal before lastRunAt, default 2h, tracked source only") matches the diff exactly; the gitignored config.mjs exclusion claim is verified true (.gitignore:105).

🧠 Graph Ingestion Notes

• [RETROSPECTIVE]: Completion-anchored cadence (terminal-timestamp-before-start) is the right primitive for expensive lanes whose runtime is a large fraction of their interval; scoped deliberately to one lane (the ticket's Out-of-Scope correctly refuses global application). Reusable shape for other heavy lanes if their runtime/interval ratio warrants it.

N/A Audits — 📡 🔗

N/A across listed dimensions: no OpenAPI/MCP-tool surface touched; no new cross-substrate convention/skill (the completion-cooldown is deliberately scoped to githubWorkflowSync only per the ticket's Out-of-Scope, so no predecessor skill needs to fire it).

🪜 Evidence Audit

PR body carries Evidence: L2 and the ACs are config-default + scheduler-due contract — fully covered by the unit specs. The two Post-Merge Validation items (observe finish-to-start after restart) are correctly listed as post-merge L3 observations, not claimed as achieved. Pass.

🎯 Close-Target Audit

• Close-target: Resolves #13832 (newline-isolated, PR-body top). #13832 labels = bug, ai, architecture, performance, model-experience — NOT epic. Valid leaf.
• Commit subject fix(ai): throttle github workflow sync cadence (#13832) — (#13832) bare ref; no stray Closes/Fixes; single outgoing commit, no stale branch-body magic keywords.

Findings: Pass.

📑 Contract Completeness Audit

• #13832 carries a Contract Ledger (2 rows): orchestrator.intervals.githubWorkflowSyncMs → default 2h, env-override preserved; and the githubWorkflowSync due calc → terminal-before-start with lastRunAt/0 fallback.
• Diff matches both rows exactly: config.template.mjs:375 = 2 * HOUR_MS (env var intact); registry.mjs due calc = getLatestTimestampMs(lastSuccessAt, lastErrorAt) ?? toTimestampMs(lastRunAt) ?? 0. No drift.

Findings: Pass.

🧪 Test-Execution & Location Audit

• Checked out locally at exact head 36409872b (direct git fetch origin pull/13833/head in this clone; verified git rev-parse HEAD).
• Ran UNIT_TEST_MODE=true playwright -c …/playwright.config.unit.mjs registry.spec.mjs config.template.spec.mjs --workers=1 → 21 passed (766ms). Confirms the author's "21 passed" + back-compat: the pre-existing #13626 test (lastRunAt fallback, line 86) still passes alongside the 2 new #13832 terminal-anchor tests (success + error paths).
• Location: specs stay at canonical test/playwright/unit/ai/.... Correct.
• Stale-base: git diff merge-base..origin/dev on the touched files is empty → PR is on current dev; clean merge.

Findings: Tests pass; no location gaps.

📋 Required Actions

No required actions — eligible for human merge.

📊 Evaluation Metrics

• [ARCH_ALIGNMENT]: 95 — clean registry-descriptor change respecting the existing pattern + config-leaf SSOT (ADR 0019); completion-anchor is the right primitive; helpers are pure/testable. −5: toTimestampMs near-duplicates DreamService's resolveSessionTimestamp (non-blocking DRY).
• [CONTENT_COMPLETENESS]: 90 — Fat-Ticket body + ticket Contract Ledger complete and accurate. −10: the two new helpers lack JSDoc (core.Base JSDoc-everything bar).
• [EXECUTION_QUALITY]: 95 — correct finish-to-start logic, bootstrap-safe fallback, both success+error terminals covered, #13626 back-compat verified (21/21 at head). −5: the in-flight-run window's cooldown is lease-enforced (benign but an undocumented semantic shift from the start-anchor).
• [PRODUCTIVITY]: 100 — every #13832 AC delivered (2h default, terminal anchor, both terminals, bootstrap fallback, focused tests).
• [IMPACT]: 45 — operational load-reducer for the live saturation incident (heavy lane: ~10 min quiet → full 2h finish-to-start); meaningful but a scoped scheduler tweak, not architectural.
• [COMPLEXITY]: 25 — small, localized (2 pure helpers + one due-calc + one config value + tests); low reader load.
• [EFFORT_PROFILE]: Quick Win — high-ROI, low-risk, fully-tested cadence fix that directly cuts the saturation.

Clean cross-family approve. The lease-serialization note + the two JSDoc/DRY nits are all non-blocking — none gate merge. Nice incident-response lever.

🖖 Vega (Claude Opus 4.8) — cross-family review.