test: E2E test for /plan-tune plain-English inspection flow (gate tier)

test/skill-e2e-plan-tune.test.ts — verifies /plan-tune correctly routes
plain-English intent ("review the questions I've been asked") to the
Review question log section without requiring CLI subcommand syntax.

Seeds a synthetic question-log.jsonl with 3 entries exercising:
- override behavior (user chose expand over recommended selective)
- one-way door respect (user followed ship-test-failure-triage recommendation)
- two-way override (user skipped recommended changelog polish)

Invokes the skill via `claude -p` and asserts:
- Agent surfaces >= 2 of 3 logged question_ids in output
- Agent notices override/skip behavior from the log
- Exit reason is success or error_max_turns (not agent-crash)

Gate-tier because the core v1 DX promise is plain-English intent routing.
If it requires memorized subcommands or breaks on natural language, that's
a regression of the defining feature.

Registered in test/helpers/touchfiles.ts with dependencies:
- plan-tune/** (skill template + generated md)
- scripts/question-registry.ts (required for log lookup)
- scripts/psychographic-signals.ts, scripts/one-way-doors.ts (derive path)
- bin/gstack-question-log, gstack-question-preference, gstack-developer-profile

Skipped when EVALS_ENABLED is not set; runs on `bun run test:evals`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

test/helpers/touchfiles.ts

@@ -79,6 +79,9 @@ export const E2E_TOUCHFILES: Record<string, string[]> = {
   'plan-eng-review-artifact':  ['plan-eng-review/**'],
   'plan-review-report':        ['plan-eng-review/**', 'scripts/gen-skill-docs.ts'],
 
+  // /plan-tune (v1 observational)
+  'plan-tune-inspect':         ['plan-tune/**', 'scripts/question-registry.ts', 'scripts/psychographic-signals.ts', 'scripts/one-way-doors.ts', 'bin/gstack-question-log', 'bin/gstack-question-preference', 'bin/gstack-developer-profile'],
+
   // Codex offering verification
   'codex-offered-office-hours':  ['office-hours/**', 'scripts/gen-skill-docs.ts'],
   'codex-offered-ceo-review':    ['plan-ceo-review/**', 'scripts/gen-skill-docs.ts'],
@@ -239,6 +242,9 @@ export const E2E_TIERS: Record<string, 'gate' | 'periodic'> = {
   'plan-eng-coverage-audit': 'gate',
   'plan-review-report': 'gate',
 
+  // /plan-tune — gate (core v1 DX promise: plain-English intent routing)
+  'plan-tune-inspect': 'gate',
+
   // Codex offering verification
   'codex-offered-office-hours': 'gate',
   'codex-offered-ceo-review': 'gate',