test: register 6 real-PTY E2E touchfiles + UI-heavy plan fixture

touchfiles.ts:
- 6 new entries in E2E_TOUCHFILES keyed to the new test files
- 6 matching E2E_TIERS classifications: 3 gate (auq-format-pty,
  plan-design-with-ui-scope, budget-regression-pty), 3 periodic
  (plan-ceo-mode-routing, ship-idempotency-pty, autoplan-chain-pty)
- gate ones are cheap/deterministic; periodic ones run weekly

touchfiles.test.ts:
- update the "skill-specific change selects only that skill" count
  from 15 → 18 (plan-ceo-review/SKILL.md change now also selects
  auq-format-pty, plan-ceo-mode-routing, autoplan-chain-pty)

test/fixtures/plans/ui-heavy-feature.md:
- planted plan with explicit UI scope keywords (pages, components,
  Tailwind responsive layout, hover/loading/empty states, modal,
  toast). Used by plan-design-with-ui-scope and autoplan-chain tests.

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

test/helpers/touchfiles.ts

@@ -92,6 +92,16 @@ export const E2E_TOUCHFILES: Record<string, string[]> = {
   'plan-design-review-plan-mode': ['plan-design-review/**', 'scripts/resolvers/preamble/generate-completion-status.ts', 'scripts/resolvers/preamble.ts', 'test/helpers/claude-pty-runner.ts'],
   'plan-devex-review-plan-mode':  ['plan-devex-review/**', 'scripts/resolvers/preamble/generate-completion-status.ts', 'scripts/resolvers/preamble.ts', 'test/helpers/claude-pty-runner.ts'],
   'plan-mode-no-op':              ['plan-ceo-review/**', 'scripts/resolvers/preamble/generate-completion-status.ts', 'scripts/resolvers/preamble.ts', 'test/helpers/claude-pty-runner.ts'],
+
+  // Real-PTY E2E batch (#6 new tests on the harness).
+  // Each one tests behavior the SDK harness can't observe (rendered TTY,
+  // numbered-option lists, multi-phase ordering, idempotency state echo).
+  'auq-format-pty':              ['plan-ceo-review/**', 'scripts/resolvers/preamble/generate-ask-user-format.ts', 'scripts/resolvers/preamble/generate-completeness-section.ts', 'scripts/resolvers/preamble.ts', 'test/helpers/claude-pty-runner.ts'],
+  'plan-ceo-mode-routing':       ['plan-ceo-review/**', 'scripts/resolvers/preamble/generate-ask-user-format.ts', 'scripts/resolvers/preamble.ts', 'test/helpers/claude-pty-runner.ts'],
+  'plan-design-with-ui-scope':   ['plan-design-review/**', 'test/fixtures/plans/ui-heavy-feature.md', 'test/helpers/claude-pty-runner.ts'],
+  'budget-regression-pty':       ['test/helpers/eval-store.ts', 'test/skill-budget-regression.test.ts'],
+  'ship-idempotency-pty':        ['ship/**', 'bin/gstack-next-version', 'lib/worktree.ts', 'test/helpers/claude-pty-runner.ts'],
+  'autoplan-chain-pty':          ['autoplan/**', 'plan-ceo-review/**', 'plan-design-review/**', 'plan-eng-review/**', 'plan-devex-review/**', 'test/fixtures/plans/ui-heavy-feature.md', 'test/helpers/claude-pty-runner.ts'],
   'e2e-harness-audit':            ['plan-ceo-review/**', 'plan-eng-review/**', 'plan-design-review/**', 'plan-devex-review/**', 'scripts/resolvers/preamble/generate-completion-status.ts', 'test/helpers/agent-sdk-runner.ts', 'test/helpers/claude-pty-runner.ts'],
   'brain-privacy-gate':           ['scripts/resolvers/preamble/generate-brain-sync-block.ts', 'scripts/resolvers/preamble.ts', 'bin/gstack-brain-sync', 'bin/gstack-brain-init', 'bin/gstack-config', 'test/helpers/agent-sdk-runner.ts'],
 
@@ -338,6 +348,16 @@ export const E2E_TIERS: Record<string, 'gate' | 'periodic'> = {
   'plan-mode-no-op': 'gate',
   'e2e-harness-audit': 'gate',
 
+  // Real-PTY E2E batch — tier classification:
+  //   gate: cheap, deterministic, run on every PR
+  //   periodic: long-running or expensive (>$3/run), run weekly
+  'auq-format-pty':            'gate',       // ~$0.50/run, single skill probe
+  'plan-ceo-mode-routing':     'periodic',   // ~$3/run, deep navigation through 8-12 prior AUQs
+  'plan-design-with-ui-scope': 'gate',       // ~$0.80/run
+  'budget-regression-pty':     'gate',       // free, library-only assertion
+  'ship-idempotency-pty':      'periodic',   // ~$3/run, real /ship in plan mode
+  'autoplan-chain-pty':        'periodic',   // ~$8/run, all 3 phases sequential
+
   // Privacy gate for gstack-brain-sync — periodic (non-deterministic LLM call,
   // costs ~$0.30-$0.50 per run, not needed on every commit)
   'brain-privacy-gate': 'periodic',