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.

autoplan/sections/manifest.json

@@ -2,7 +2,7 @@
   "$schema": "https://gstack.dev/schemas/section-manifest.json",
   "skill": "autoplan",
   "version": 1,
-  "note": "PASSIVE registry (v2 plan T9 / CM2). Fields are IDs, file paths, human titles, and human-readable trigger text ONLY. The skeleton's phase sequencing (Sequential Execution + the Phase 0 UI/DX scope detection) is the ONLY place that decides WHEN to read a section \u2014 Phase 2 and Phase 2.5 are conditional and their sections must NOT be read when their scope is absent; required section reads are checked by test/skill-e2e-autoplan-chain.test.ts (auditAutoplanMethodReads). No machine predicate here \u2014 see docs/designs/v2_PLAN.md:663.",
+  "note": "PASSIVE registry (v2 plan T9 / CM2). Fields are IDs, file paths, human titles, and human-readable trigger text ONLY. The skeleton's phase sequencing (Sequential Execution + the Phase 0 UI/DX scope detection) is the ONLY place that decides WHEN to read a section \u2014 Phase 2 and Phase 2.5 are conditional and their sections must NOT be read when their scope is absent; no paid eval checks the required section reads since the autoplan chain eval was retired (TODOS.md). No machine predicate here \u2014 see docs/designs/v2_PLAN.md:663.",
   "sections": [
     {
       "id": "ceo-phase",