Function verify_repository 

pub fn verify_repository(
    bones_dir: &Path,
    regenerate_missing: bool,
) -> Result<VerifyReport, VerifyError>

Verify sealed shard manifests and parse-sanity-check the active shard.

Sealed shard policy:

• Every sealed shard (all except latest) must have a manifest.
• If missing and regenerate_missing is true, regenerate from shard file.
• Existing manifests must match computed event_count, byte_len, and file_hash.

Active shard policy:

• The active shard is not required to have a manifest.
• Active shard content is parsed for TSJSON sanity.

Errors

Returns VerifyError on filesystem access failures.