v0.1.5

Fix: backfill now derives project_id from each transcript's own cwd, so sessions indexed before install are visible to the default project-scoped search. Previously every backfilled session was stored with project_id = NULL and silently hidden — recall appeared to start at install day.

Docs: document --all / --project search scoping (skill + README), fix the recall usage example, and tighten the privacy note.