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ersatztv/docs
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fix(706,707,711): fence the review-verdict write on the timeline retarget count
Three related defects in the `review-verdict/h10` gate, all surfaced by the
cross-family review of PR #705.

#706 race 1 — a stale run could overwrite a fresher verdict, permanently. The
race was reproduced live rather than reasoned about (Gitea 1.25.4): with every
other workflow stripped, probe PR #722 showed run 7520 (`opened`) finishing 20s
AFTER run 7521 (`synchronize`) started. `pull_request_target` runs for one PR
genuinely overlap, older finishing last.

The issue proposed serializing with a non-cancelling concurrency group. That is
REFUTED by measurement: with the group active, runs 7528/7529 still overlapped
and 7528 ended 36s after 7529 began. A first probe appeared to show the group
working — a negative control with no `concurrency:` key at all showed the same
cancellations, revealing Gitea auto-cancels superseded `push` runs on its own
and the probe had measured that, not the group. The auto-cancel does not extend
to `pull_request_target`.

The fix leaves the runs unserialized and instead makes an overtaken run decline
to write: count `change_target_branch` events on the PR timeline at start and
again just before the POST, and post nothing if the count moved. The COUNT is
the key because the branch NAME is ABA-vulnerable (`main -> S -> main` reads
`main` at both ends — how #698 route 1 forged its exemption). Abstaining is a
handoff, not a stall: every retarget fires `edited`, so the event that makes a
run abstain has already queued its successor. `updated_at` was rejected as the
key precisely because it moves for comments/labels, which queue nothing.

#706 race 2 — a human BLOCKED landing in the unclosable window between the
pre-POST re-read and the POST was silently turned green. After an exemption
`success` the job now re-reads the per-POST history and repairs its own status
to `pending` if a human verdict appeared above a high-water mark taken just
before the write. The repair is `pending`, never a copy of the human's state.
The id comparison is load-bearing: a presence test would fire forever on a
base-mismatched verdict and deadlock that PR's exemption.

#707 — `pr-changed-files.sh` bound `.base.ref` and `.head.sha` across the
enumeration but never `.base.sha`, so an ordinary advance of `main` mid-paging
could drop a code path from an offset-paged diff and leave a complete-looking
docs-only list. Now bound from the JSON already fetched (no new round trips).

#711 — `.codex/` added to PROTECTED. It mirrors `.claude/hooks/` byte for byte,
including the merge-consent hook, so the "a PR that can weaken the gate cannot
exempt itself" rule had an incomplete path list. Latent today (untracked), live
the moment anyone tracks it.

Residuals are stated, not implied: a retarget inside the final round-trip, and
the repair being itself a read-then-write. Gitea's status API has no
compare-and-set, so neither reaches zero; both now fail toward `pending`.

Tests: 398 pass in scripts/tests. Each new guard was mutation-checked — the
fence's motion comparison, the untrusted-count gate, the repair POST and the id
high-water mark were each neutered in turn and the intended test went red while
its positive control stayed green.

fixes #706
fixes #707
fixes #711

Decisions-Edit: yes
2026-08-03 21:41:16 +02:00
..

docs/ — task-signal map

Purpose: route a fresh contributor/agent to the minimal set of docs for the task at hand, instead of a mandatory front-to-back read. Update this doc in the same PR that adds, removes, or retitles a doc below, or that changes which sections a task signal points to.

Start here, always

  • CLAUDE.md (repo root) — project intro: architecture, layout, dev commands, conventions, Task Completion Protocol.
  • docs/contributing.md — established code patterns (CQRS/MediatR, LanguageExt, the ChicoryTV SPA, EF Core dual-provider migrations, FFmpeg pipeline, analyzers, testing). Read before any non-trivial change.

Task signal → minimal sections

Signal Read
Session startup / "what's next" (no issue named) docs/handoffs/chicorytv-issue-queue.md (standing kickoff — two concurrent tracks: orientation ‖ scripts/select-queue.sh 5)
Named-issue pickup Skip queue selection; go straight to focused retrieval — see "Knowledge retrieval" below, then the issue body
Adding/changing a /api/* endpoint docs/api-conventions.md checklist + docs/endpoint-index.md
Adding a ChicoryTV SPA screen docs/spa-conventions.md
Scheduling / playout engine work docs/domain-model.md + decisions catalog rows keyed sched.* (docs/decisions/README.md)
Concurrency / optimistic-locking work docs/api-conventions.md §7a/b/c + docs/decisions/optimistic-concurrency.md
Auth / security-surface work docs/decisions/api-auth-security.md
CI / release pipeline work docs/ci-cd.md + docs/decisions/release-ci-governance.md
Live local run / Playwright-MCP verification docs/e2e-local.md + scripts/e2e-local.sh
Adding/changing a UI-E2E browser flow docs/e2e-local.md → "UI-E2E harness" + scripts/e2e-ui.sh
What does a test suite cover docs/testing.md
Legacy Blazor route lookup docs/blazor-route-parity.md (historical #91 phase (b) inventory)
"Why do we do X this way" / challenging a convention Catalog-first: docs/decisions/README.md (active rows) → follow the row's link to docs/decisions/records/<area>/<topic>.md for full rationale. docs/decisions/archive/<area>/ only for "what did the rule used to be."

Knowledge retrieval (MemPalace + catalog + Gitea)

These four rules are the seam agreed with server-management#642 (the Gitea→MemPalace exporter). They apply whether the question comes up via MemPalace, a grep, or a stale comment:

  1. Current conventions/decisions → catalog-first. Start at docs/decisions/README.md; discover via the ErsatzTV-Decisions wing (active) / ErsatzTV-Decisions-Archive (superseded/retired). Resolve by topic/key, never by chasing a file path.
  2. Issue history → evidence, not authority. The Gitea-ErsatzTV wing is historical narrative that may be stale; it never overrides current Markdown.
  3. The breadcrumb rule (the crux behavior change). A file path named inside a historical issue comment (e.g. "grep docs/decisions.md 2026-07-17", "see …") is a breadcrumb, not a live pointer. Find the current rule via the catalog / active wing by concept; do not treat the named path as current. (Why it's safe: still-current → in the active wing, breadcrumb resolves; superseded → the active wing returns the successor and a literal follow lands on a record that announces its own status: superseded; retired → the active wing returns nothing, which is itself the signal. The validator-enforced move-to-archive/ is what prevents the catastrophic "superseded rule read as current" case.)
  4. Fallback when MemPalace is stale/down: docs/decisions/README.md catalog, then rg '^`key: <dotted.key>`' docs/decisions/. MemPalace is never authority nor sole fallback.

MemPalace is candidate discovery only — every passage is verified against its cited Markdown/Gitea source before use. Never derive live queue state from MemPalace, #237, or historical comments; queue state is live Gitea state, retrieved via scripts/select-queue.sh (see docs/handoffs/chicorytv-issue-queue.md). Full retrieval contract (altitude/precedence, staleness bounds, what's mined per issue): docs/handoffs/chicorytv-issue-queue.md → "Knowledge retrieval".

Also present in docs/

  • docs/domain-model.md — what the app IS: entity glossary, channel→playout→schedule/block concept map, where each concept is edited in the SPA.
  • docs/api-conventions.md — checklist for adding/changing a /api/* endpoint (controllers, DTOs, error mapping, auth, OpenAPI regen, tests).
  • docs/spa-conventions.md — playbook for adding a screen to the ChicoryTV React SPA.
  • docs/e2e-local.md (+ scripts/e2e-local.sh) — how to run a live local instance for manual or Playwright-MCP verification.
  • docs/testing.md — testing map: what each *.Tests project / web suite covers, golden-file nets, the timezone-independence rule, how to run subsets, the per-PR verification gate.
  • docs/blazor-route-parity.md — historical record of the completed #91 phase (b) cutover: the Blazor Server UI is removed and every legacy route now 302-redirects to its SPA equivalent (or falls through to the catch-all → /app). Read it for the full legacy→SPA route inventory.
  • docs/decisions/records/<area>/<topic>.md — one active decision record per file, YAML frontmatter (key/title/status/since/supersedes/superseded-by, plus optional stale-after/sources — ersatztv#603), rationale prose in the body. The filename is the key, so one-active-record-per-key is a filesystem property (ersatztv#610). docs/decisions.md and the topic files remain as the lifecycle-schema narrative plus a "Records formerly in this file" index, which is what keeps older date-based pointers resolvable. Generated active view: docs/decisions/README.md (catalog / task router) — start there. Superseded/retired records live in docs/decisions/archive/ and are read only for history, never for "what is the current rule."
  • docs/ci-cd.md — build/test/release pipeline, versioning, dependency management.
  • docs/rest-api.md — REST API design doc for ersatztv#2 (goals, conventions, per-slice plan). Largely superseded day-to-day by docs/api-conventions.md; read this for the original rationale.
  • docs/mcp.md — the ErsatzTV.Mcp stdio JSON-RPC MCP server (#58): how it wraps /api/v1 as read + cautious-write tools, its config/env vars, auth, security posture, and the tool catalog.
  • docs/channels.md — Channel entity field reference.
  • docs/m3u-xmltv.md — M3U/XMLTV generation overview (ChannelPlaylist, GetChannelGuideHandler).
  • docs/fork-strategy.md — divergence policy vs upstream ErsatzTV.
  • docs/design-sync.md — Claude Design ↔ repo screen workflow (#92).
  • docs/endpoint-index.md — generated REST endpoint index (method/path/operationId/summary per OpenAPI tag). Do not edit by hand; regenerated by scripts/generate-endpoint-index.py / scripts/update-openapi.sh.
  • docs/handoffs/chicorytv-issue-queue.md — static session kickoff prompt + workflow lore. Queue state is live Gitea state, retrieved each session via scripts/select-queue.sh — see that file's standing kickoff for the two concurrent tracks (orientation ‖ selection). ersatztv#237 is a closed, archival historical tracker (superseded by startup.parallel-orientation in docs/decisions.md) — not a live pointer.
  • docs/tracker-retrofit-triage-237.md — audit trail for the #524 triage of ersatztv#237's 111 comments (method, per-comment classification, totals). Evidence for the docs.tracker-comment-retrofit decision; read it only when triaging another over-cap tracker.
  • docs/handoffs/rest-api.md — original handoff prompt for kicking off the REST API work (#2).