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/lib/doc-consistency.test.mjs

@@ -961,6 +961,46 @@ test('S15: profile tables encode each built-in yaml phase_models exactly', () =>
   }
 });
 
+// --- S34 (V30) — economy is self-declared experimental until the cross-tier
+// Jaccard floor (0.55) is empirically calibrated (Step-17 calibration deferred
+// to v4.2). The status must be visible in BOTH the profile data
+// (lib/profiles/economy.yaml `experimental: true`) and every profile doc's
+// economy row. Fix the SOURCE doc/profile, not these pins.
+test('S34: economy profile row is flagged experimental across all profile docs', () => {
+  for (const doc of PROFILE_DOCS) {
+    const body = read(doc);
+    const row = body.split('\n').find((l) => /^\|\s*`economy`/.test(l));
+    assert.ok(row, `${doc}: profile table missing an \`economy\` row`);
+    assert.match(
+      row,
+      /experimental/i,
+      `${doc}: the \`economy\` table row must flag it experimental ` +
+        `(uncalibrated Jaccard floor, S34/V30) — matches lib/profiles/economy.yaml experimental: true`,
+    );
+  }
+});
+
+test('S34: economy experimental flag agrees with parked-synthetic calibration status', () => {
+  // economy.yaml experimental:true is honest ONLY while calibration is still
+  // parked-synthetic. When empirical calibration lands (status: empirical),
+  // drop experimental:true in the SAME change — this pin enforces the linkage.
+  const eco = parseDocument(read('lib/profiles/economy.yaml')).parsed.frontmatter;
+  const cal = parseDocument(read('tests/synthetic/profile-jaccard-calibration.md')).parsed.frontmatter;
+  if (cal.status === 'parked-synthetic') {
+    assert.equal(
+      eco.experimental,
+      true,
+      'while calibration is parked-synthetic, economy.yaml must stay experimental: true',
+    );
+  } else {
+    assert.notEqual(
+      eco.experimental,
+      true,
+      'calibration is no longer parked-synthetic — drop economy experimental: true in the same change',
+    );
+  }
+});
+
 test('S15: README cost prose does not resurrect the false Sonnet-swarm claim', () => {
   // All 24 sub-agents are model: opus (operator-pinned, commit 40d8742) and the
   // model is uniform per phase — there is no "Opus orchestrates / Sonnet runs