fix: the fix round before 6.3.0 (order 10)

1. A step of only tests can never be proven red. One reading,
   stepTestsOnly (lib/parsers/plan-schema.mjs, test paths from the new
   lib/util/test-path.mjs): the plan validator warns PLAN_STEP_TESTS_ONLY,
   red-proof --plan/--step adds tests_only to a not-red-at-base, and
   /trekexecute and the step helper send such a step straight up to the
   plan instead of into fix rounds that cannot succeed. /trekplan, the plan
   template and plan-critic (dimension 8, still 12) say the test belongs in
   the step that builds the behaviour.
2. Timing tests under load: the hook helper's kill limit is 30 s and per
   call overridable; SC #14 passes on the fastest of up to three runs
   against the same 800 ms limit (tests/helpers/timing.mjs).
3. The example plan's On failure lines open with a K11 word.
4. /trekreview saves the reviewer's whole answer for the findings check and
   names FINDING_PROSE_LINE_OUT_OF_RANGE (error: re-ask; warning: report).
5. The criteria runner's commands run without NODE_TEST_CONTEXT
   (commandEnv, moved to lib/util/command-env.mjs).
6. The resolver returns effort only when the brief's phase signal sets one;
   the four commands said it always did.

Also: the K2 hook tests used fixed session ids in a per-user temp dir, so
two suites running at once took each other's approval records; the ids are
now unique per run.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/HANDOVER-CONTRACTS.md

@@ -269,6 +269,7 @@ prose form (relaxed in S26 so the template's prose emission parses).
 7. **Every plan_version, no version bump** (a plan without the field validates unchanged; voyage-lekerepo trial 2, 2026-10-08):
    - **K10 — `Regression:`** (optional step field): ONE backticked command the criteria runner's allowlist runs, with no pipe and no `&&` (first backticked span, as for `Verify:`). The executor runs it green before the step's checkpoint; a step without it runs nothing new. `Verify:` stays the step's own red-first test. One that can never run is `PLAN_STEP_REGRESSION_NOT_RUNNABLE` (an error; a warning under `--soft`).
    - **K11 — `On failure:`** opens with one of `revert`, `retry`, `skip`, `escalate` (case-insensitive; a leading `**`, `_`, backtick or `-` is ignored, other leading characters are not; `onFailureAction` in `lib/parsers/plan-schema.mjs`), the words `/trekexecute` reads; any other opening is the warning `PLAN_STEP_ON_FAILURE_UNKNOWN`. A missing `On failure:` is unchanged (the executor defaults to `escalate`).
+   - **A step of only tests** (order 10, voyage-lekerepo trial 3, 2026-10-09): when every file in a step's `Files:` is a test (its `Test first:` file, or a path `lib/util/test-path.mjs` reads as a test: under `tests/`, `test/`, `__tests__/`, `spec/`, `specs/`, or named `*.test.*`, `*.spec.*`, `*_test.*`, `*_spec.*`, `test_*.py`, but never a document such as `docs/specs/api.md`; `stepTestsOnly` in `lib/parsers/plan-schema.mjs`), the warning is `PLAN_STEP_TESTS_ONLY`: the behaviour its tests cover exists at its start point, so it can never be proven red. A step without `Files:` is not judged. At run time `red-proof.mjs --plan <plan.md> --step <N>` puts the same reading on a `not-red-at-base` as `tests_only`, and `/trekexecute` sends a `tests_only: true` step straight up to the plan.
 
 **Validation strategy:**
 
@@ -300,6 +301,7 @@ The strongest validation in the entire pipeline. Phase 5.5 (planning-orchestrato
 | `PLAN_ARCH_RULE_NO_ENFORCER` / `PLAN_ARCH_RULE_NO_PROOF` | 1.8 architectural: a rule without an enforcer, or a checked rule without an existing proving step | Name the enforcer; name the step |
 | `PLAN_STEP_REGRESSION_NOT_RUNNABLE` | K10, any version: a step's `Regression:` is not one command the allowlist runs (a pipe, `&&`, no backticks, an unknown runner) | One backticked runner call (`npm test`); a wider check goes in `bash tests/<script>.sh` |
 | `PLAN_STEP_ON_FAILURE_UNKNOWN` | K11, any version, warning: `On failure:` does not open with revert / retry / skip / escalate | Open with the word, then the specifics |
+| `PLAN_STEP_TESTS_ONLY` | Any version, warning: every file in the step's `Files:` is a test, so the step can never be proven red | Move the test into the step that builds the behaviour |
 
 **The plan gate (K3).** `node lib/validators/plan-gate.mjs <plan.md> [--json]` decides whether a plan may go on: **0** = it validates strict, its `## Critic Verdict` matches the current text, no BLOCKER is open, and every open MAJOR was accepted by the operator; **1** = stop, with `reasons` (`PLAN_GATE_INVALID_PLAN`, `PLAN_GATE_VERSION` — below plan_version 1.8, `PLAN_GATE_NO_VERDICT`, `PLAN_GATE_VERDICT_MALFORMED`, `PLAN_GATE_VERDICT_STALE`, `PLAN_GATE_OPEN_BLOCKER`, `PLAN_GATE_ROUNDS_EXHAUSTED`, `PLAN_GATE_OPEN_MAJOR` — rounds left: revise, `PLAN_GATE_OPEN_MAJOR_FINAL` — after the last round: ask the operator) and `warnings` (`PLAN_GATE_OPEN_MAJOR` for majors the operator accepted); **2** = could not read the plan. `--hash <plan.md>` prints the operative hash; Phase 9 takes it before the reviewers read the plan. `--record <plan.md> --reviewed <hash>` reads plan-review-dedup output on stdin (which lists the reviewers that delivered, `sources`) and writes the next round; exit 2 when a reviewer is missing or the plan changed since `--hash`; it refuses round 4 (exit 1, stop and ask) unless `--extra-round` follows the operator's yes, and refuses that flag before the cap is spent. Unrated findings count as blockers. The review log is excluded from the hash only up to its first other heading, so a step placed under it is hashed. `--accept-open <plan.md>` records the operator's "build as is" for the current round's open MAJORs (`accepted_open` in the verdict block, bound to the round and the plan hash; only after the last round; never for a BLOCKER; exit 1 when rounds are left, the verdict is stale, a blocker is open or no major is). Operator decision 2026-10-08: open majors used to be warnings, and a weakness the critics named was built and came back from `/trekreview` as MAJOR. plan-critic and scope-guardian rate on the review catalogue's tiers. The verdict is a trace of the review, not a signature.