feat(run,config): operating hours window + timezone-aware lifecycle state

Add OperatingHoursCfg (enabled/timezone/weekdays/start_hhmm/stop_hhmm) so
the run loop can align with NYSE session hours instead of the user's
local wall clock (fixes DST drift between NY and Europe/Bucharest).

- Config parses [options.operating_hours] and resolves ZoneInfo at load,
  fail-fast on invalid tz or weekday names. The tz is cached on
  _tz_cache so the detection loop pays zero per-tick cost.
- LifecycleState tracks user_paused + last_window_state across ticks.
- Module-scope _should_skip(now, state, cfg, canary) returns skip reason
  or None. Weekday check uses datetime.weekday() + a fixed MON..SUN list
  (locale-free; strftime('%a') is localized).
- _maybe_log_transition emits market_open / market_closed once per edge.
  R2: when last_window_state is None (startup), just seed — do not send
  a spurious market_open alert when run_live_async launches in-window.
- _run_tick consults the lifecycle guard before scheduling the heavy
  detection thread, so drain + transition logging still happen when the
  tick is skipped.
- CLI flags --tz / --weekdays / --oh-start / --oh-stop override TOML.
  (Kept distinct from the existing --start-at/--stop-at sleep-until-time
  semantics to avoid breaking current deployments — deviation noted.)
- configs/example.toml documents the new [options.operating_hours] table.

Tests: parametrized window matrix (tests #8), transition logging (#9),
notification side-effect (#10), R2 #20 startup suppression, R2 #22
locale-independent weekday, plus guards for user_paused / canary
precedence and config-parse error paths.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

configs/example.toml

@@ -88,6 +88,17 @@ dead_letter_path = "logs/dead_letter.jsonl"
 [options.alerts]
 fire_on_phase_skip = true
 
+# Operating hours — detection only runs on allowed weekdays + HH:MM window.
+# Timezone is the source of truth (NYSE local); the runtime converts tick
+# timestamps to this zone so DST rollovers stay aligned with the exchange.
+# Override from CLI with --tz / --weekdays / --oh-start / --oh-stop.
+[options.operating_hours]
+enabled = false
+timezone = "America/New_York"
+weekdays = ["MON", "TUE", "WED", "THU", "FRI"]
+start_hhmm = "09:30"
+stop_hhmm = "16:00"
+
 # Per-kind screenshot-attach toggles. All default to true on upgrade.
 # Accepts either a bare bool (legacy: attach_screenshots = true) or this table.
 [options.attach_screenshots]