Addresses the P1 brittleness in the Step 3 verifier so learned_from edges
(graph/live.ts:413) can't be silently zeroed on stage.
- Capture overlap AT detection time as Collision.gitOverlap (podman.ts), while
engineer_states are still fresh, instead of re-deriving from possibly-stale
state when the user clicks. deriveWasRealCollision() now prefers this stored
evidence and only falls back to a live re-derivation for older collisions.
- Canonicalize engineer names (trim + lowercase) on both the capture and the
fallback path, so "Karti" vs "karti" no longer misses the git state.
- conflictKey now reuses the shared comparableBasename() helper (dedupe).
shared/src/collision.ts gains optional `gitOverlap?: boolean` (additive).
shared rebuilt; backend+frontend typecheck + eslint pass. PLAN.md rung 3 updated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
sb-iam
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