feat(data-branch): Branch Protect Snapshot to guard LCA history from GC#24313

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gouhongshen:feat/branch-protect-snapshot

Commits on May 9, 2026

feat(data-branch): add Branch Protect Snapshot to guard LCA history from GC

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test: fix CI failures for TestDoDropSnapshot and show snapshots mock

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fix(data-branch): cycle-safe reclaim DAG walk + use shared 'branch' kind constant

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