When opening a database that exists but is missing issue_prefix config
(typical in fresh clone scenarios), show a helpful error message instead
of cryptic migration invariant errors.
The new message:
- Explains the database needs initialization
- Detects if a JSONL file exists and shows the issue count
- Suggests the exact command to run: bd import -i <path>
- Falls back to suggesting bd init --prefix if no JSONL exists
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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