Stratified GC#6

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vaidas-shopify wants to merge 32 commits into

Commits on May 7, 2026

pack-base-stratum: introduce .base-stratum sidecar for stratified packs
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repack-geometry: skip base-stratum packs
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gc: add stratify maintenance task for Stratified GC
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stratify: validate base-stratum packs before each run
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gc: add surface-gc maintenance task for Stratified GC
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gc: wire stratify and surface-gc into geometric strategy
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maintenance: document stratify and surface-gc configuration
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doc: add technical documentation for Stratified GC
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stratify: add cascade demotion and kept-pack traversal boundary
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stratify: geometric consolidation of base-stratum packs
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stratify: fix incrementality of commit-id frontier
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pack-base-stratum: write companion .keep for backwards compatibility
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surface-gc: fall back to gc.pruneExpire for cruft expiration
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maintenance: add trace2 logging for Stratified GC tasks
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stratify: support unit suffixes for batch-size
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pack-objects: restrict eager add_pending_oid to excluded-open packs
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packfile: size add_packed_git buffer for the longest suffix
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stratify: deduplicate anchor refs from config
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stratify: scope base-stratum pack basename to the anchor
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stratify: add stratify-prune task for orphaned anchor packs
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stratify: deduplicate anchors at the OID level within a run
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pack-base-stratum: write sidecars atomically to survive concurrent rewrites
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stratify: validate base-stratum packs independently of timestamp order
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stratify: filter cross-anchor and weaken closure to the per-repo union
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stratify: fix batch-size truncation anchor and ensure forward progress
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stratify: surface base-stratum sidecar write failures
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stratify: peel annotated-tag anchors before commit lookup
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stratify-prune: relabel orphan packs to preserve cross-anchor closed set
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Commits on May 11, 2026

stratify-prune: pick relabel target per pack against ancestry, not config order
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Commits on May 12, 2026

stratify-prune: borrow survivor anchor_commit for no-merge-base orphans
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Commits on May 14, 2026