# Capability accretion

Make run N+1 better through deterministic, replay-safe facts mined from validated prior runs—not model training or mutable hidden memory.

Promote a validated failure-to-fix pair by a reusable class key: gate, evaluator/toolchain kind, and normalized failure fingerprint. Store a reference to the validated fix artifact/diff and the evidence that it passed.

1. Extend the concept rails to retain `classKey`, `fixRef`, confidence, and contradiction state.
2. Deliver high-confidence facts deterministically at plan compilation (contract/gate tightening) or as a bounded stage instruction. L3 remains an instance-recall fallback.
3. Mine positive patterns separately: successful plan shapes, resolved commands, and useful retrievals.
4. Revoke or decay facts when later recorded evidence contradicts them.

Every promotion and delivery is event-derived and recorded; replay never re-mines live state.