~anthropic/claude-sonnet-latest → A (6:4)

Commit A fixes a real correctness/performance issue (unbounded Deque growth, extra write-amplifying trim step) by switching to an append-only List with query-time capping, and adds a test verifying the cap behavior. Commit B is a large architectural rewrite (deleting engine.rs, introducing graph/parse modules) but the diff shown deletes the old implementation and tests without showing the new graph/parse modules' content, making it impossible to verify the new design's correctness or completeness from this patch alone.