refactor: replace hand-rolled BFS with walk_dag_async in fetch paths
Extract _walk_commit_delta(session, repo_id, want, have) helper that delegates to walk_dag_async — the existing DAG walk utility already used in _is_ancestor_db. The adjacency function fetches one commit per node and caches it so the same row is never queried twice within a walk.
Replace identical hand-rolled BFS loops in wire_fetch_presign and wire_fetch_bundle with a single call to _walk_commit_delta. No behavior change — all 11 fetch bundle tests and presign spot-checks pass.
sha256:1388ad4d303c6f936983265d1c2ebd598db6113ac89bd8df7438536f3c83d873
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sha256:be045f9457227238246bca6ec404e58db0afdca27481c5c25e82f8caa003f133
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