Context Mode Purge Permanently deletes session data for this project. Two scopes are supported (issue #520): - Project scope ( ): wipes EVERYTHING — knowledge base, all session DB rows for every session, events markdown, and stats. - Session scope ( or ): wipes ONLY the matching session's rows + FTS5 chunks. Sibling sessions, project stats, and the FTS5 store file are preserved. Instructions 1. Decide the scope first with the user: - "Wipe just one session?" → ask for the . - "Wipe the whole project?" → confirm scope:'project' (this is the destructive, irreversible default). 2. Warn the user…