test: add gate-tier mode-posture regression tests

Three gate-tier E2E tests detect when preamble / template changes
flatten the distinctive posture of /plan-ceo-review SCOPE EXPANSION or
/office-hours (startup Q3, builder mode). The V1 regression that this
PR fixes shipped without anyone catching it at ship time — this is the
ongoing signal so the same thing doesn't happen again.

Pieces:
- `judgePosture(mode, text)` in `test/helpers/llm-judge.ts`. Sonnet
  judge with mode-specific dual-axis rubric (expansion: surface_framing
  + decision_preservation; forcing: stacking_preserved +
  domain_matched_consequence; builder: unexpected_combinations +
  excitement_over_optimization). Pass threshold 4/5 on both axes.
- Three fixtures in `test/fixtures/mode-posture/` — deterministic input
  for expansion proposal generation, Q3 forcing question, and builder
  adjacent-unlock riffing.
- `plan-ceo-review-expansion-energy` case appended to
  `test/skill-e2e-plan.test.ts`. Generator: Opus (skill default). Judge:
  Sonnet.
- New `test/skill-e2e-office-hours.test.ts` with
  `office-hours-forcing-energy` + `office-hours-builder-wildness`
  cases. Generator: Sonnet. Judge: Sonnet.
- Touchfile registration in `test/helpers/touchfiles.ts` — all three as
  `gate` tier in `E2E_TIERS`, triggered by changes to
  `scripts/resolvers/preamble.ts`, the relevant skill template, the
  judge helper, or any mode-posture fixture.

Cost: ~$0.50-$1.50 per triggered PR. Sonnet judge is cheap; Opus
generator for the plan-ceo-review case dominates.

Known V1.1 tradeoff: judges test prose markers more than deep behavior.
V1.2 candidate is a cross-provider (Codex) adversarial judge on the
same output to decouple house-style bias.

test/skill-e2e-plan.test.ts

@@ -6,6 +6,7 @@ import {
   copyDirSync, setupBrowseShims, logCost, recordE2E,
   createEvalCollector, finalizeEvalCollector,
 } from './helpers/e2e-helpers';
+import { judgePosture } from './helpers/llm-judge';
 import { spawnSync } from 'child_process';
 import * as fs from 'fs';
 import * as path from 'path';
@@ -183,6 +184,79 @@ Focus on reviewing the plan content: architecture, error handling, security, and
   }, 420_000);
 });
 
+// --- Plan CEO Review SCOPE EXPANSION energy (V1.1 mode-posture regression gate) ---
+
+describeIfSelected('Plan CEO Review Expansion Energy E2E', ['plan-ceo-review-expansion-energy'], () => {
+  let planDir: string;
+
+  beforeAll(() => {
+    planDir = fs.mkdtempSync(path.join(os.tmpdir(), 'skill-e2e-plan-ceo-exp-'));
+    const run = (cmd: string, args: string[]) =>
+      spawnSync(cmd, args, { cwd: planDir, stdio: 'pipe', timeout: 5000 });
+
+    run('git', ['init', '-b', 'main']);
+    run('git', ['config', 'user.email', 'test@test.com']);
+    run('git', ['config', 'user.name', 'Test']);
+
+    // Use the shared fixture so expansion-energy regressions are reproducible.
+    const fixture = fs.readFileSync(
+      path.join(ROOT, 'test', 'fixtures', 'mode-posture', 'expansion-plan.md'),
+      'utf-8',
+    );
+    fs.writeFileSync(path.join(planDir, 'plan.md'), fixture);
+
+    run('git', ['add', '.']);
+    run('git', ['commit', '-m', 'add plan']);
+
+    fs.mkdirSync(path.join(planDir, 'plan-ceo-review'), { recursive: true });
+    fs.copyFileSync(
+      path.join(ROOT, 'plan-ceo-review', 'SKILL.md'),
+      path.join(planDir, 'plan-ceo-review', 'SKILL.md'),
+    );
+  });
+
+  afterAll(() => {
+    try { fs.rmSync(planDir, { recursive: true, force: true }); } catch {}
+  });
+
+  testConcurrentIfSelected('plan-ceo-review-expansion-energy', async () => {
+    const result = await runSkillTest({
+      prompt: `Read plan-ceo-review/SKILL.md for the review workflow.
+
+Read plan.md — that's the plan to review. This is a standalone plan document, not a codebase — skip any codebase exploration or system audit steps.
+
+Choose SCOPE EXPANSION mode. Skip any AskUserQuestion calls — this is non-interactive. Auto-approve the ideal-architecture approach in 0C-bis. For 0D, run all three analyses (10x check, platonic ideal, delight opportunities), then emit exactly 2 concrete expansion proposals in the opt-in ceremony.
+
+Write your expansion proposals to ${planDir}/proposals.md with ONLY the proposal text — no conversational wrapper, no review summary, no mode analysis. Each proposal separated by "---".`,
+      workingDirectory: planDir,
+      maxTurns: 15,
+      timeout: 360_000,
+      testName: 'plan-ceo-review-expansion-energy',
+      runId,
+      model: 'claude-opus-4-6',
+    });
+
+    logCost('/plan-ceo-review (EXPANSION ENERGY)', result);
+    recordE2E(evalCollector, '/plan-ceo-review-expansion-energy', 'Plan CEO Review Expansion Energy E2E', result, {
+      passed: ['success', 'error_max_turns'].includes(result.exitReason),
+    });
+    expect(['success', 'error_max_turns']).toContain(result.exitReason);
+
+    const proposalsPath = path.join(planDir, 'proposals.md');
+    if (!fs.existsSync(proposalsPath)) {
+      throw new Error('Agent did not emit proposals.md — expansion energy eval requires proposal output');
+    }
+    const proposalText = fs.readFileSync(proposalsPath, 'utf-8');
+    expect(proposalText.length).toBeGreaterThan(200);
+
+    const scores = await judgePosture('expansion', proposalText);
+    console.log('Expansion energy scores:', JSON.stringify(scores, null, 2));
+    // Pass threshold: 4/5 on both axes (good — matches posture with minor weakness).
+    expect(scores.axis_a).toBeGreaterThanOrEqual(4);  // surface_framing
+    expect(scores.axis_b).toBeGreaterThanOrEqual(4);  // decision_preservation
+  }, 600_000);
+});
+
 // --- Plan Eng Review E2E ---
 
 describeIfSelected('Plan Eng Review E2E', ['plan-eng-review'], () => {