Previously, 'bd import' would fail if the database didn't exist, even when
importing into a directory with a .beads/ folder. This made it impossible
to recreate a database from JSONL after schema changes or database removal.
Changes:
- Allow import command to create database when .beads/ directory exists
- Prefer local .beads/vc.db over ancestor databases for import operations
- Enable the workflow: mv .beads/vc.db backup && bd import .beads/issues.jsonl
Fixes#180
Amp-Thread-ID: https://ampcode.com/threads/T-7842ea55-6ce4-4162-9ad8-299124a15946
Co-authored-by: Amp <amp@ampcode.com>
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