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@@ -1,5 +1,51 @@
 # Changelog
 
+## [1.21.1.0] - 2026-04-28
+
+## **plan-ceo-review smoke tightens. The "agent skips Step 0 and ships a plan" regression now fails the gate.**
+
+The v1.15.0.0 real-PTY harness shipped with a smoke that accepted either `'asked'` or `'plan_ready'` as success. That OR was too lax for `/plan-ceo-review` specifically: the skill template mandates Step 0A premise challenge plus Step 0F mode selection BEFORE any plan write, so reaching `plan_ready` first IS the regression. This release tightens the assertion to `'asked'` only for that smoke, and refactors the runner so the contract is testable in <1s instead of $0.50 of stochastic PTY.
+
+### The numbers that matter
+
+Numbers come from `git diff --shortstat origin/main..HEAD` and `bun test test/helpers/claude-pty-runner.unit.test.ts` on a clean tree.
+
+| Metric | Δ |
+|---|---|
+| Net branch size vs main | +162 / −65 lines (3 files) |
+| New unit tests added | **+24** (claude-pty-runner.unit.test.ts) |
+| Unit suite runtime | **14ms** (deterministic, free-tier) |
+| Real-PTY gate runs verified | **4 clean PTY runs** (3 lock-in + 1 post-refactor) |
+| Outcome assertions covered | **5/5** (was 3/5; `plan_ready` is now FAIL for plan-ceo) |
+| Reviewers run on this PR | plan-eng-review (CLEARED) + codex consult + 2 specialists + adversarial |
+
+### What this means for builders
+
+Three new classes of harness regression are now caught deterministically in the free tier instead of waiting on a $0.50 stochastic PTY run. The classifier is extracted into a pure `classifyVisible()` function so reordering branches in the polling loop fails the unit tests instead of silently shipping. Permission dialogs (which render numbered lists) are filtered out of the `'asked'` classification so a permission prompt cannot pose as a Step 0 skill question. The bare phrase `Do you want to proceed?` no longer triggers permission detection on its own — it now requires a file-edit context co-trigger, so a skill question that contains the phrase isn't mis-classified.
+
+For `/plan-ceo-review` specifically: any future preamble slim-down or template edit that lets the agent skip Step 0 and write a plan will fail the gate before the PR ships. Pull, run `bun test`, and the harness layer is provably tighter without you having to spend a token.
+
+### Itemized changes
+
+#### Added
+
+- `test/helpers/claude-pty-runner.unit.test.ts`: 24 deterministic tests covering `isPermissionDialogVisible` (with the new co-trigger contract), `isNumberedOptionListVisible`, `parseNumberedOptions`, and the new `classifyVisible()` runtime path. Free-tier, runs on every `bun test`.
+- `classifyVisible(visible)` in `claude-pty-runner.ts`: pure classifier extracted from the polling loop. Returns `{ outcome, summary } | null`. Branch order: silent_write → plan_ready → asked → null (with permission-dialog filter). Live-state branches (process exited, "Unknown command") stay in the runner.
+- `TAIL_SCAN_BYTES = 1500` exported constant. Shared between `runPlanSkillObservation` and the routing test's nav loop so tuning stays in sync.
+- `env?: Record<string, string>` option on `runPlanSkillObservation`, threaded to `launchClaudePty`. Plumbing for future env-driven test isolation (gstack-config does not yet honor env overrides; tracked as post-merge follow-up).
+
+#### Changed
+
+- `test/skill-e2e-plan-ceo-plan-mode.test.ts`: assertion narrowed from `['asked', 'plan_ready']` to `'asked'` only. Failure message now branches on `outcome` (plan_ready vs timeout vs silent_write) with a tailored diagnosis line, and references skill-template section names instead of line numbers (durable to template edits).
+- `isPermissionDialogVisible`: bare `Do you want to proceed?` now requires a file-edit context co-trigger (`Edit to <path>` or `Write to <path>`). Other clauses (`requested permissions to`, `allow all edits`, `always allow access to`, `Bash command requires permission`) remain unconditional.
+- `test/skill-e2e-plan-ceo-mode-routing.test.ts`: replaces the local `1500` magic number with the shared `TAIL_SCAN_BYTES` constant.
+
+#### For contributors
+
+- The runner change is additive and the existing sibling smokes (`plan-eng`, `plan-design`, `plan-devex`, `plan-mode-no-op`) keep their loose `['asked', 'plan_ready']` assertion. Their behavior is unchanged.
+- Post-merge follow-ups captured in `TODOS.md`: per-finding AskUserQuestion count assertion (V2), env-driven gstack-config overrides (so `QUESTION_TUNING=false` actually isolates the test), path-confusion hardening on `SANCTIONED_WRITE_SUBSTRINGS`.
+
+
 ## [1.20.0.0] - 2026-04-28
 
 ## **Browser-skills land. `/scrape <intent>` first call drives the page; second call runs the codified script in 200ms.**
 
@@ -213,6 +213,56 @@ scope of that PR; deliberately deferred to keep PTY-import small.
 
 ## Testing
 
+## P2: Per-finding AskUserQuestion count assertion for /plan-ceo-review
+
+**What:** PTY E2E test that drives /plan-ceo-review through Step 0 with a stable fixture diff containing N known findings, asserts that exactly N distinct AskUserQuestions fire (one per finding) before plan_ready.
+
+**Why:** The skill template repeats "One issue = one AskUserQuestion call. Never combine multiple issues into one question." at every review checkpoint. No test enforces it. The current `skill-e2e-plan-ceo-plan-mode.test.ts` smoke (post-v1.21.1.0) only catches "agent skipped Step 0 entirely." Batching findings into one question slips through silently.
+
+**Pros:** Locks in the strongest contract the skill mandates. Catches a real failure mode (the original attachment showed 2 findings batched as 0 questions).
+**Cons:** Needs a stable fixture diff to keep finding count deterministic (~1 day human / ~30 min CC). Opus may reasonably consolidate two related findings, so the assertion needs a forgiving lower bound (e.g., `>= ceil(N * 0.6)`) rather than strict equality.
+
+**Context:** The PTY harness (`runPlanSkillObservation`) returns at first terminal outcome — for V2 we need a streaming variant that counts AskUserQuestions across the whole session up to `plan_ready`. Probably a new helper alongside `runPlanSkillObservation`.
+
+**Depends on:** Stable fixture diff (`test/fixtures/plans/multi-finding.diff` or similar) with a small known set of issues that triggers all 4 review sections.
+
+**Priority:** P2.
+**Effort:** S (CC: ~30 min once fixture exists). Captured from v1.21.1.0 plan-eng-review D2.
+
+---
+
+## P3: Honor env vars in gstack-config (so QUESTION_TUNING/EXPLAIN_LEVEL actually isolate tests)
+
+**What:** `gstack-config get <key>` reads `~/.gstack/config.yaml`. `runPlanSkillObservation` plumbs `env: { QUESTION_TUNING: 'false', EXPLAIN_LEVEL: 'default' }` through to the spawned `claude` process — but the skill preamble bash uses `gstack-config get question_tuning`, which never looks at env. The env passthrough is theater on current code.
+
+**Why:** Without env honoring, the v1.21.1.0 plan-ceo-review smoke is still flaky on machines with `question_tuning: true` set in YAML. AUTO_DECIDE preferences would skip the rendered AskUserQuestion list, masking the regression we want to catch.
+
+**Pros:** Makes the gate test hermetic across machines. The env wiring is already in place — only `gstack-config` needs to read env first, fall back to YAML.
+**Cons:** Touches the gstack-config binary across all 3 platforms (linux/darwin/windows). Cross-binary refactor.
+
+**Context:** Captured from v1.21.1.0 adversarial review. Documented honestly in the test docstring as a known limitation.
+
+**Priority:** P3.
+**Effort:** S. Single-file edit to `bin/gstack-config` (~10 LOC for env-first lookup).
+
+---
+
+## P3: Path-confusion hardening on SANCTIONED_WRITE_SUBSTRINGS
+
+**What:** `runPlanSkillObservation`'s silent-write detector uses substring matching on a few sanctioned paths (`.gstack/`, `CHANGELOG.md`, `TODOS.md`, etc). A write to `node_modules/some-pkg/CHANGELOG.md` or `src/foo/.gstack/leak.ts` is currently sanctioned because the substring matches anywhere in the path.
+
+**Why:** Defensive — no current bug exploits this, but a malicious skill or fixture could write to a path that happens to contain `.gstack/` or `CHANGELOG.md` and slip past silent-write detection.
+
+**Pros:** Hardens the harness against future skill misbehavior. Aligns substring rules with their intent.
+**Cons:** Need to anchor against absolute prefixes (`os.homedir() + '/.gstack/'`, worktree root) which makes the test less portable across machines.
+
+**Context:** Captured from v1.21.1.0 adversarial review (HIGH/FIXABLE finding, pre-existing). Refactored into a `SANCTIONED_WRITE_SUBSTRINGS` constant in v1.21.1.0 but the substring-includes logic is unchanged from before.
+
+**Priority:** P3.
+**Effort:** S.
+
+---
+
 ## P1: Structural STOP-Ask forcing function across all skills
 
 **What:** Design and implement a structural forcing function that catches when a skill mandates per-issue AskUserQuestion but the model silently substitutes batch-synthesis. Candidate mechanisms: question-count assertion (skill declares expected question count in frontmatter; post-run audit logs if model fired <N), typed question templates (skill hands the model pre-built AskUserQuestion payloads rather than prose instructions), or a canUseTool-based post-run audit that compares declared-gates-fired vs expected.
 
@@ -1 +1 @@
-1.20.0.0
+1.21.1.0
@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "1.20.0.0",
+  "version": "1.21.1.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",
Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"name": "gstack",`
`3`		`- "version": "1.20.0.0",`
	`3`	`+ "version": "1.21.1.0",`
`4`	`4`	`"description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",`
`5`	`5`	`"license": "MIT",`
`6`	`6`	`"type": "module",`