feat(tui): Phase 4 completion + Phase 5 session/lock/text-width

Phase 4 (bd-1df9) — all 5 acceptance criteria met:
- Sync screen with delta ledger (bd-2x2h, bd-y095)
- Doctor screen with health checks (bd-2iqk)
- Stats screen with document counts (bd-2iqk)
- CLI integration: lore tui subcommand (bd-26lp)
- CLI integration: lore sync --tui flag (bd-3l56)

Phase 5 (bd-3h00) — session persistence + instance lock + text width:
- text_width.rs: Unicode-aware measurement, truncation, padding (16 tests)
- instance_lock.rs: Advisory PID lock with stale recovery (6 tests)
- session.rs: Atomic write + CRC32 checksum + quarantine (9 tests)

Closes: bd-26lp, bd-3h00, bd-3l56, bd-1df9, bd-y095

src/cli/commands/mod.rs

@@ -15,6 +15,7 @@ pub mod sync;
 pub mod sync_status;
 pub mod timeline;
 pub mod trace;
+pub mod tui;
 pub mod who;
 
 pub use auth_test::run_auth_test;
@@ -50,6 +51,7 @@ pub use sync::{SyncOptions, SyncResult, print_sync, print_sync_json, run_sync};
 pub use sync_status::{print_sync_status, print_sync_status_json, run_sync_status};
 pub use timeline::{TimelineParams, print_timeline, print_timeline_json_with_meta, run_timeline};
 pub use trace::{parse_trace_path, print_trace, print_trace_json};
+pub use tui::{TuiArgs, find_lore_tui, run_tui};
 pub use who::{
     WhoRun, half_life_decay, print_who_human, print_who_json, query_active, query_expert,
     query_overlap, query_reviews, query_workload, run_who,