test: retire the finding-count cluster and trim its helpers (C)

- C0/C1: the five never-green evals (skill-e2e-autoplan-chain and
  skill-e2e-plan-{ceo,eng,design,devex}-finding-count) failed on harness and
  budget, never on skill behavior; delete them, their touchfile/tier ids,
  AUTOPLAN_CHAIN_BUDGET and the dedicated eighth periodic slice (--slices 7).
- C2: delete the helper groups whose only paid consumers were those files
  (11 modules), trim claude-pty-runner and eng-seeded-coverage to the paid
  closure, and delete the free replay tests whose assertions exercised only
  that dead code (89 files, 135 orphaned fixtures). Blocks that used dead code
  only as input for a live subject keep their assertions: the multiSelect
  default moved to plan-review-decisions, runner PTY tests use inline caller
  policies, and the timer-safe budget checks moved to eng-finding-retry-budget.
- The eight production-touching files stay except ceo-current-decision-record
  (its template read only feeds the retired counter).
- CARVE_GUARDS.autoplan is behavioral 'none'; TODOS records the lost chain
  and per-finding cadence coverage with their re-entry tests.

test/helpers/carve-guards.ts

@@ -77,8 +77,9 @@ export interface CarveGuard {
    *  - 'external' → covered by a dedicated bespoke test (complex fixtures, e.g.
    *                 ship's git/VERSION/CHANGELOG state). The data-driven loop
    *                 skips it; E1 asserts `externalTest` exists instead.
+   *  - 'none'     → no behavioral guard; the static invariants still apply.
    */
-  behavioral: 'plan' | 'prompt' | 'external';
+  behavioral: 'plan' | 'prompt' | 'external' | 'none';
   /** Required when behavioral === 'external': path (repo-relative) to the dedicated test. */
   externalTest?: string;
   /** Parity: max bytes for the always-loaded skeleton (asserts the carve shrank it). */
@@ -563,8 +564,8 @@ do not launch the downstream skill or open a browser.`,
       ],
       gateAfterStop: 'AskUserQuestion options:',
     },
-    behavioral: 'external',
-    externalTest: 'test/skill-e2e-autoplan-chain.test.ts', // phase-complete markers live ONLY in sections — its assertions ARE section-read proof
+    // The retired skill-e2e-autoplan-chain was its only section-read proof.
+    behavioral: 'none',
     maxSkeletonBytes: 70_000, // Phase-specific outside coverage, native fallback, and harness guard.
     minUnionBytes: 85_000, // measured union 86,926
     mustContain: ['6 Decision Principles', 'TASTE DECISION', 'USER CHALLENGE', 'consensus', 'Restore Point'],