Module path 

Database file path resolution.

The storage engine needs to know where to put the SQLite file. This module resolves the path from three sources, in priority order:

1. Explicit config: [store] path in mcpr.toml — user chose a specific location.
2. Environment variable: MCPR_DB — useful for CI, Docker, or per-session overrides.
3. Default: ~/.mcpr/store.db — all mcpr state lives under ~/.mcpr/.

The parent directory is created automatically if it doesn’t exist.

Functions

ensure_parent_dir

Ensure the parent directory of the given path exists.

resolve_db_path

Resolve the database file path.