v0.6.0: strengthen backup integrity

RELEASE_NOTES.md

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+# v0.6.0
+
+This release focuses on backup integrity, recovery workflows, and clearer operational status.
+
+## Highlights
+
+- Manifest entries now include relative paths, so tree backups can be verified accurately.
+- SQLite manifests migrate automatically to include the new path column.
+- `verify` now detects missing files, zero-byte files, and size mismatches by default.
+- Exports use per-asset staging directories and rename completed files into place when possible.
+- Failure tracking is deduplicated by asset ID and records attempts and latest error details.
+- New `failures list` and `failures clear` commands.
+- `retry-failed --clear-on-success` removes successfully retried failures.
+- New `status` command with text and JSON output.
+- Release workflow now publishes these release notes to the release page.
+
+## Recommended Upgrade Notes
+
+- Existing JSONL manifests continue to load; entries without `path` fall back to `filename`.
+- Existing SQLite manifests are migrated with `ALTER TABLE downloads ADD COLUMN path ...` during open.
+- `verify` is stricter now and may report problems that older versions ignored.
+
+## Assets
+
+- `photoscli`: macOS binary.
+- `photoscli-0.6.0-macos.zip`: binary plus README, USERGUIDE, and CHANGELOG.
+- `USERGUIDE.md`: standalone user guide.