fix(#1857): test gates normalize to one-shot + bounded timeout (no watch-mode hang)

A GSD verification gate resolves a project's test command and runs it. vitest
defaults to WATCH mode in an interactive TTY — exactly where a user runs
`gsd-execute-phase` — so a resolved `npm test`/`pnpm test` backed by vitest never
exited and the orchestrator waited indefinitely. Recovery needed the user to
manually prompt "something blocking?".

Fix — one shared helper + a bounded, surfacing timeout on the test-command gates:
- New pure module src/normalize-test-command.cts + `gsd-tools query
  normalize-test-command` verb: rewrites a resolved command to a best-effort
  one-shot form (direct vitest → `vitest run`; jest `--watch` → `--watchAll=false`;
  a package-manager `test` script whose package.json runner is watch-vitest →
  `CI=true` prefix; handles `--dir`; already-one-shot commands unchanged —
  never double-flagged). Named `normalize-test-command` (not `test-*`) so the
  file does not match node --test's default `test-*` discovery glob.
- The three gates that HUNG or silently-continued route through that ONE helper
  and bound execution with `timeout $(config-get workflow.test_gate_timeout)`
  (new config key, default 600s): the regression gate (extracted to
  execute-phase/steps/regression-gate.md since execute-phase.md is size-frozen —
  it shrank 93528→93132; ABORTS on exit 124), the post-merge gate, and the
  audit-fix gate (previously an UNBOUNDED `eval`). All name watch/dev mode on 124.
- verify-phase's gate was ALREADY bounded (a fixed `timeout 300`, not a hang), so
  it only gains the normalizer (so a watch runner exits fast) + a watch-mode hint
  on 124, staying under its frozen 40960-byte tier cap.

Security hardening (review): the normalizer only rewrites a runner named as a
standalone command TOKEN (so `run-vitest.js`/`make test-vitest`/paths are never
mangled), is length-capped and uses only linear-time split-based scanning (no
super-linear backtracking on an adversarial `workflow.test_command`), and reads
package.json only when it is a regular file (never blocks on a FIFO via `--dir`).

Config key `workflow.test_gate_timeout` (seconds, default 600) registered in the
schema manifest + templates/config.json + docs/CONFIGURATION.md (mirrors
workflow.cross_ai_timeout). New module registered in .gitignore, eslint ignores,
inventory manifest/index. All 16 golden-install-parity fixtures + workflow size
baseline regenerated for the changed shipped files; bin/lib is excluded from the
parity manifest.

Tests: tests/normalize-test-command.test.cjs (normalizer units incl. security
hardening) and tests/test-gate-watch-mode.test.cjs (the three core gates route
through the shared helper + configured timeout + exit-124 watch-mode hint;
verify-phase asserted as normalize-only/already-bounded).
tests/execute-phase-active-flags.test.cjs repointed at the extracted step;
tests/planner-language-regression.test.cjs allowlist comment updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/CONFIGURATION.md

@@ -55,6 +55,7 @@ GSD stores project settings in `.planning/config.json`. Created during `/gsd-new
     "cross_ai_execution": false,
     "cross_ai_command": null,
     "cross_ai_timeout": 300,
+    "test_gate_timeout": 600,
     "security_enforcement": true,
     "security_asvs_level": 1,
     "security_block_on": "high",
@@ -322,6 +323,7 @@ All workflow toggles follow the **absent = enabled** pattern. If a key is missin
 | `workflow.cross_ai_execution` | boolean | `false` | Delegate phase execution to an external AI CLI instead of spawning local executor agents. Useful for leveraging a different model's strengths for specific phases. Added in v1.36 |
 | `workflow.cross_ai_command` | string | (none) | Shell command template for cross-AI execution. Receives the phase prompt via stdin. Must produce SUMMARY.md-compatible output. Required when `cross_ai_execution` is `true`. Added in v1.36 |
 | `workflow.cross_ai_timeout` | number | `300` | Timeout in seconds for cross-AI execution commands. Prevents runaway external processes. Added in v1.36 |
+| `workflow.test_gate_timeout` | number | `600` | Wall-clock timeout (seconds) for a verification test gate; a watch-mode runner (vitest/jest) that never exits is aborted after this budget instead of hanging the orchestrator (#1857) |
 | `workflow.ai_integration_phase` | boolean | `true` | Enable the `/gsd-ai-integration-phase` command. When `false`, the command exits with a configuration gate message |
 | `workflow.auto_prune_state` | boolean | `false` | When `true`, automatically prune stale entries from STATE.md at phase boundaries instead of prompting |
 | `workflow.pattern_mapper` | boolean | `true` | Run the `gsd-pattern-mapper` agent between research and planning to map new files to existing codebase analogs |

docs/INVENTORY-MANIFEST.json

@@ -373,6 +373,7 @@
       "model-catalog.cjs",
       "model-profiles.cjs",
       "model-resolver.cjs",
+      "normalize-test-command.cjs",
       "onboard-projection.cjs",
       "package-identity.cjs",
       "package-legitimacy.cjs",

docs/INVENTORY.md

@@ -510,6 +510,7 @@ Full listing: `gsd-core/bin/lib/*.cjs`.
 | `surface.cjs` | Runtime surface module — manages the runtime enable/disable surface state independently of the install-time profile marker (ADR-0011 Phase 2) |
 | `task-command-router.cjs` | Thin CJS subcommand router adapter for `gsd-tools task` |
 | `template.cjs` | Template selection and filling with variable substitution |
+| `normalize-test-command.cjs` | Normalizes a resolved test command to a one-shot form so a watch-mode runner (vitest/jest) cannot hang a verification gate (#1857); shared by all four test-command gates (regression, post-merge, audit-fix, verify-phase) |
 | `uat.cjs` | UAT file parsing, verification debt tracking, audit-uat support |
 | `uat-predicate.cjs` | UAT-passed predicate — markdown-aware evaluation of HUMAN-UAT results; returns pass only when all required checks pass; ignores false-positive contexts (frontmatter, fenced code, blockquotes, HTML comments) |
 | `ui-safety-gate.cjs` | Shell-free word-boundary UI token detector (#3706, #3718); reads phase-section text from stdin, exits 0 (UI found) or 1 (no UI); also deployed to `gsd-core/bin/lib/` so the GSD installer ships it to `$RUNTIME_DIR` (#448) |