chore(voyage): S34 — V30 economy-profile self-declares experimental (uncalibrated Jaccard floor)

The economy profile's cross-tier Jaccard floor (0.55) rests on parked-synthetic
fixtures; empirical Step-17 calibration is v4.2-budget-gated ($60–120,
unauthorized). Fork resolved as label-not-calibrate: the experimental status,
previously prose-only in docs/profiles.md, now lives in the profile data and is
machine-checked. No new user-facing capability — honest labeling + a guard.

- lib/profiles/economy.yaml: add `experimental: true` (with rationale comment).
- lib/validators/profile-validator.mjs: recognize `experimental` as an OPTIONAL
  boolean; non-boolean → PROFILE_INVALID_ENUM. Absent ⇒ tier is stable
  (premium/balanced unaffected, profile_version stays 1.0 — additive).
- README.md + docs/operations.md + docs/profiles.md: flag the `economy` table
  row "⚠ Experimental (uncalibrated Jaccard floor)".
- tests/synthetic/profile-jaccard-calibration.md + analysis §6/§10 + backlog
  plan §S34: cross-reference the marker; mark V30/S34 done.

+5 tests (739 → 744, 742/2/0): economy declares experimental:true; premium and
balanced do not; validator rejects non-boolean experimental; every profile-doc
economy row is flagged; the flag tracks the calibration's parked-synthetic
status (must drop in the same change that lands real calibration).

Closes the balance backlog (4/4, S31–S34). claude plugin validate green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LqBYc8Ltrk7LipyJmGxXiB

tests/validators/profile-validator.test.mjs

@@ -148,3 +148,57 @@ test('PROFILE_REQUIRED_PHASES export drift-pin', () => {
     'PROFILE_REQUIRED_PHASES contract drift — pin contract',
   );
 });
+
+// S34 (V30) — economy carries an explicit `experimental` marker.
+// The cross-tier Jaccard floor (0.55) rests on parked-synthetic fixtures;
+// empirical Step-17 calibration is deferred to v4.2 ($60-120 LLM budget,
+// unauthorized). Until a real calibration lands, `economy` is self-declared
+// experimental in the profile DATA — not only in prose — so the status
+// survives a docs rewrite. See tests/synthetic/profile-jaccard-calibration.md.
+
+test('S34: economy.yaml declares experimental: true (uncalibrated Jaccard floor)', () => {
+  const r = validateProfile(join(REPO_ROOT, 'lib', 'profiles', 'economy.yaml'));
+  assert.equal(r.valid, true, `economy.yaml should validate: ${JSON.stringify(r.errors)}`);
+  assert.equal(r.parsed.frontmatter.experimental, true,
+    'economy.yaml must carry experimental: true until the Jaccard floor is empirically calibrated (S34/V30)');
+});
+
+test('S34: premium + balanced are NOT flagged experimental', () => {
+  for (const name of ['premium', 'balanced']) {
+    const r = validateProfile(join(REPO_ROOT, 'lib', 'profiles', `${name}.yaml`));
+    assert.equal(r.valid, true, `${name}.yaml should validate: ${JSON.stringify(r.errors)}`);
+    assert.notEqual(r.parsed.frontmatter.experimental, true,
+      `${name}.yaml must not be flagged experimental`);
+  }
+});
+
+test('S34: validator type-checks experimental as boolean (PROFILE_INVALID_ENUM)', () => {
+  const bad = `---
+profile_version: "1.0"
+name: bad-experimental
+phase_models:
+  - phase: brief
+    model: sonnet
+  - phase: research
+    model: sonnet
+  - phase: plan
+    model: sonnet
+  - phase: execute
+    model: sonnet
+  - phase: review
+    model: sonnet
+  - phase: continue
+    model: sonnet
+parallel_agents_min: 2
+parallel_agents_max: 3
+external_research_enabled: false
+brief_reviewer_iter_cap: 1
+experimental: "yes"
+---
+`;
+  const r = validateProfileContent(bad);
+  assert.equal(r.valid, false, 'experimental: "yes" (string) must be rejected');
+  const found = r.errors.find(e => e.code === 'PROFILE_INVALID_ENUM' && /experimental/.test(e.message));
+  assert.ok(found, `expected PROFILE_INVALID_ENUM for experimental, got: ${JSON.stringify(r.errors)}`);
+  assert.match(found.message, /boolean/);
+});