fix(optimization): require explicit retrieval methods

[drewstone]

Summary

• require a complete OptimizationMethod for retrieval optimization
• remove implicit run-level finite-grid fallback and stale bounded result metadata
• retain finite enumeration only as the explicitly supplied boundedRetrievalConfigMethod()
• reject missing or malformed methods consistently across knowledge optimization APIs

Verification

• pnpm test: 441 passed, 10 skipped
• focused optimization tests: 25 passed
• pnpm typecheck
• pnpm lint: 176 files checked
• pnpm build
• pnpm verify:package

Upstream status

The revised official GEPA and SkillOpt factories are not yet published. npm latest is @tangle-network/agent-eval@0.123.8; this change depends only on the canonical OptimizationMethod contract.

[tangletools]

✅ Auto-approved drewstone PR — 88763bf3

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-07-24T01:46:53Z}