Kyle Isom 9012b889d6 Add archive package: tar.zst service directory snapshots ...

- Snapshot: VACUUM INTO for consistent db copy, excludes live db
  files and backups/, injects db snapshot, custom exclude patterns,
  streaming output via io.Writer
- Restore: extract tar.zst with path traversal protection
- zstd via github.com/klauspost/compress/zstd
- 5 tests: full roundtrip with db integrity verification,
  without db, exclude patterns, dest dir creation
- Update PROGRESS.md: all 9 packages complete, 87 total tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-25 16:37:18 -07:00

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