feat(run): arm + prime alerts, mid-session catchup, late-start guard

Notify on IDLE→ARMED and ARMED→PRIMED so the user gets staged warnings
before FIRE. If atm run starts mid-cycle on dark_green/dark_red, synth
a catchup arm so the prime alert still fires (audit tagged catchup:true).
If it starts on light_green/light_red, emit one late_start warn and skip
the FSM feed — FIRE already passed.

Extracted _handle_tick() as a pure helper (takes fsm + duck-typed
notifier/audit Protocols) so the dispatch is unit-testable without
mocking FanoutNotifier. 9 new tests cover arm, prime, refresh silence,
catchup synth-arm (+ audit), and late-start on both directions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

TODOS.md

@@ -23,6 +23,18 @@ Standalone helper `atm dump --duration 4h --dir samples/` that just captures fra
 
 Expand README with concrete Windows Task Scheduler XML export + import steps, example triggers for 16:30→18:30 and 21:00→23:00, and DST-change checklist reminder.
 
+## P2-alert-mute-flags
+
+Per-kind mute toggles for notifications in case arm/prime turn out too noisy in live sessions:
+
+- `cfg.notify.arm: bool = true`
+- `cfg.notify.prime: bool = true`
+- `cfg.notify.late_start: bool = true`
+
+Default all true. Gate each `notifier.send()` in `_handle_tick()` on the flag. Start after 3+ live sessions confirm the signal/noise ratio.
+
+Blocked on: Faza 1 baseline evidence.
+
 ## P3-faza2-exec
 
 Auto-execution on TradeLocker. Blocked on TOS audit (see `docs/phase2-prop-firm-audit.md`). Not started until GO decision + 20+ Faza 1 sessions.