1fe6035be5
- New sqlite-store.ts: VarStore + TagStore backed by SQLite (WAL mode) - Tables: vars (composite PK name+schema), var_history (with MAX_HISTORY truncation), tags (composite PK target+key) - Indexed queries for name, created, updated, tag key - Tags/labels stored as JSON columns with post-filter - Removed var-store.ts (JSONL append-log implementation) - Updated tests: JSONL assertions → SQLite db file checks Closes #60