feat(pack-fetch): Phase 3 — pack-based fetch returns presigned pack URLs
wire_fetch_bundle now queries musehub_pack_index for distinct pack_ids covering the needed objects. When coverage is 100%, returns presigned GET URLs for the push-time bundles instead of fetching N objects individually from MinIO — reducing fetch round-trips to O(distinct packs).
- Extend FetchBundleResult with pack_fetch, pack_urls, commits, snapshots - Add step 3a: pack index coverage check in wire_fetch_bundle - Add presign_bundle_get to BlobBackend (S3 presigned GET for bundles) - Add PF-1..4 TDD tests (all green, 12/12 passing across phases 1-3)
sha256:0e57608ae6b9f42358be2017649f98fd9cc509ba99c346dfbdb84de5bfaf9e59
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sha256:0edad367a69566400f4cd314c24e5a2e6caf4aa774e8cab911050fbd6e3d4e21
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feat(commit-graph): Phase 2 — MusehubCommitGraph model, migratio…
sha256:8c5ac08973d96bb7bceb23153cd110a8ed0a0f9f6edbfb081e0dc9300b6d14ad
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feat(pack-gc): Phase 4 — GC consolidates N push packs into one bundle
sha256:28e1d7ddf80d751ec881b5c8bf57f6259b9b36b829d3ab1730784b626ece4d0e
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