- store/store.go: New SQLite storage for TUI local mode
- Open() with WAL mode and NORMAL synchronous
- Schema initialization for ml_experiments, ml_runs, ml_metrics, ml_params, ml_tags
- GetUnsyncedRuns(), GetRunsByExperiment(), MarkRunSynced()
- GetRunMetrics(), GetRunParams() for run details
- config/config.go: Add local mode configuration fields
- DBPath, ForceLocal, ProjectRoot fields
- Experiment struct with Name and Entrypoint
- IsLocalMode() and GetDBPath() helper methods
- go.mod: Add modernc.org/sqlite v1.36.0 dependency