refactor: remove align_repository_with_state duplication

- Remove duplicate AlignmentResult struct from nostr/policy/state.rs
- Remove duplicate align_repository_with_state method from StatePolicy
- Import and use the canonical implementation from git::sync
- Re-export AlignmentResult from git::sync in policy/mod.rs

The git::sync version is preferred as it:
- Handles symbolic refs (ref:) properly by skipping them
- Uses git::oid_exists which is more general than git::commit_exists
- Has a cleaner iteration pattern (delete first, then update/create)

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