- bd-6pni: Auto-filter tombstoned issues with mismatched prefixes during
import instead of failing. Tombstones from contributor PRs with different
test prefixes are pollution and safe to ignore.
- bd-ffr9: Stop recreating deletions.jsonl after tombstone migration.
Added IsTombstoneMigrationComplete() check to all code paths that write
to the legacy deletions manifest.
- bd-admx: Fix perpetual "JSONL file hash mismatch" warning. Now clears
both export_hashes AND jsonl_file_hash when mismatch detected, so the
warning doesn't repeat.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>