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

docs/balance-backlog-plan.md

@@ -55,13 +55,15 @@ Bundles the three items that D1–D3 turned into documentation:
 - **Verify:** `node --test`; counts/model claims coherent across all docs; `agent-frontmatter.test.mjs` unchanged + green (no model change).
 - **Depends-on:** none (settles the inventory baseline).
 
-### S34 — V30: economy-profile Jaccard calibration  ·  [CODE · non-breaking · pin-adjacent]
+### S34 — V30: economy-profile Jaccard calibration  ·  [CODE · non-breaking · pin-adjacent] ✅ DONE (2026-06-20)
 - **Goal:** the `economy`-profile Jaccard floor (0.55) is grounded in parked synthetic fixtures (Step-17 calibration deferred). Either run the calibration against real fixtures and replace the floor, **or** clearly relabel `economy` as experimental/uncalibrated in docs + the profile.
-- **Files:** `lib/parsers/profile-jaccard.mjs`, `tests/synthetic/profile-jaccard-calibration.md`, `docs/profiles.md`, `docs/operations.md`.
-- **TDD:** a test pinning either the calibrated floor or the explicit experimental label.
-- **Verify:** `node --test`; profile docs unambiguous about economy's status.
+- **Resolution: Path B — label, not calibrate.** The empirical run is v4.2-budget-gated ($60–120, unauthorized), so the fork is forced. `lib/profiles/economy.yaml` now carries `experimental: true` (validator type-checks the optional boolean); README + `docs/operations.md` + `docs/profiles.md` flag the `economy` row; the calibration doc cross-references the marker. (`lib/parsers/profile-jaccard.mjs` was untouched — it was listed for the calibration path only.)
+- **TDD:** 5 tests — economy declares `experimental: true`, premium/balanced do not, validator rejects non-boolean `experimental`, every profile-doc economy row flagged experimental, and the flag tracks the calibration's `parked-synthetic` status. Baseline 739 → **744 (742/2/0)**.
+- **Verify:** ✅ `node --test` green; ✅ `claude plugin validate` (1 accepted warning); economy's status now unambiguous + machine-checked.
 - **Depends-on:** none (lowest urgency; placed last).
 
+**Backlog complete — 4/4 sessions shipped (S31–S34). All 8 §6 items disposed; 2 real code changes (V15 export-trim, V30 economy-label), the rest doc/audit.**
+
 ---
 
 ## Verification (plan-level)