Snapshot base manifest on first PR build to fix stale branch diffs#12922

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ericholscher wants to merge 3 commits intomainfrom

claude/improve-stale-branch-diffs-7xCbH

Commits on Apr 10, 2026

Snapshot base manifest on first PR build to fix stale branch diffs
claude
committed
Address review feedback: deduplicate storage path helper, fix comment accuracy
claude
committed
Use exists() instead of parsing JSON for snapshot write-once check
claude
committed