test: add deleteByTitle to ItemRepository

[gdiab]

Summary

• Adds a deleteByTitle method to ItemRepository for cleaning up items by title

Test plan

• Manual verification

🤖 Generated with Claude Code

[claude]

Critical: SQL injection. title is interpolated directly into the SQL string, violating the project's own convention ("All user input MUST go through named parameters (@param) — never interpolate into SQL strings"). A title like ' OR '1'='1 would delete every row in the table.

Suggested change

	const result = this.db.prepare(`DELETE FROM items WHERE title = '${title}'`).run();
	const result = this.db.prepare('DELETE FROM items WHERE title });

[claude]

Data integrity: search_fts rows will be orphaned. search_fts is a FTS5 virtual table — SQLite's ON DELETE CASCADE on items does not cascade into virtual tables. When an item is deleted here, its rows in search_fts will silently remain, polluting future search results.

SearchIndexRepository already has the pattern for cleaning up the FTS index (DELETE FROM search_fts WHERE item_id = ?). This method needs to either:

1. Accept a db transaction and call that cleanup as part of the same transaction, or
2. Be moved up to a service that can coordinate both repositories atomically.

Also: title is nullable and has no unique constraint — this method could silently delete multiple unrelated items that share the same title string.