Add SQLite read-only mode for commands that only query data (list, ready,
show, stats, blocked, count, search, graph, duplicates, comments, export).
Changes:
- Add NewReadOnly() and NewReadOnlyWithTimeout() to sqlite package
- Opens with mode=ro to prevent any file writes
- Skips WAL pragma, schema init, and migrations
- Skips WAL checkpoint on Close()
- Update main.go to detect read-only commands and use appropriate opener
- Skip auto-migrate, FlushManager, and auto-import for read-only commands
- Add tests verifying file mtime is unchanged after read operations
This fixes the issue where file watchers (like beads-ui) would go into
infinite loops because bd list/show/ready modified the database file.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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