- runFeatureValidation now lazy-ensures a linked assertion (FN-5902) instead
of the removed zero-assertion auto-pass, for both task-completion and the
stranded-feature recovery path
- CONCEPTS.md: union of main's Merge-lifecycle cluster and this branch's
Missions clusters; Contract Assertion entry updated for FN-5902 semantics
- AGENTS.md: take main's docs/solutions + CONCEPTS.md pointer wording
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>