feat(v0.6-phase3): reminder system + schema split + NWS dedup relaxation

Third broadcast type Active: clock-driven re-broadcasts of still-live
events at human-scale cadences. WFIGS fires 8h, itd_511 work zones daily
8 AM Mountain, SWPC G-storms 8h. NWS is NOT a clock reminder -- instead
the per-CAP-id dedup is relaxed to allow re-broadcast if >3h since last.
Schema split first_broadcast_at + last_broadcast_at on all reminder-
eligible tables. Wire prefix logic: New (first sight), Update (WFIGS
material change), Active (clock reminder). All cadences, channels, day-
of-week patterns, timezones, and termination conditions GUI-editable
from day one via the existing adapter_config editor. Termination:
tombstone OR containment_100 OR end_date_passed (no max-count). Quiet
hours not respected -- ripped out in Phase 2.

Schema (v11.sql):
  - ALTER TABLE fires|nws_alerts|traffic_events|quake_events|swpc_events|
    gauge_readings ADD COLUMN first_broadcast_at REAL
  - Backfill: UPDATE ... SET first_broadcast_at = last_broadcast_at
    WHERE last_broadcast_at IS NOT NULL
  - ALTER TABLE adapter_meta ADD COLUMN reminder_enabled INTEGER NOT NULL
    DEFAULT 0
  - UPDATE adapter_meta SET reminder_enabled=1 WHERE adapter IN
    ('wfigs', 'swpc') -- itd_511_work_zone is a new meta row seeded
    with reminder_enabled=1
  - SCHEMA_VERSION 10 -> 11

Handler commit-callbacks (wfigs/nws/quake/swpc/incident):
  - UPDATE ... SET last_broadcast_at=?, first_broadcast_at=COALESCE(
    first_broadcast_at, ?) -- first_broadcast_at stamped once, never
    overwritten

NWS handler (meshai/central/nws_handler.py):
  - _render() gains a prefix kwarg
  - After-first-broadcast branch: when (now - last_broadcast_at) >=
    adapter_config.nws.duplicate_allowed_after_seconds (default 10800
    = 3h), allow the re-broadcast with prefix=Active. Under the
    window, suppress as before. The commit callback continues to
    update last_broadcast_at.

ReminderScheduler (meshai/notifications/reminders/__init__.py):
  - Async loop, ticks every 60s
  - Each tick: SELECT adapter FROM adapter_meta WHERE reminder_enabled=1
  - Per adapter, load reminders_<adapter> config from adapter_config
    (cadence_kind, cadence_value, channels, terminate_when, dow_mask,
    timezone)
  - Interval cadence: rows where last_broadcast_at <= now - cadence_value
  - Clock cadence: localizes now to configured tz, finds slots that
    just passed in the last tick window, gated by dow_mask
  - Termination conditions checked per adapter:
      wfigs.containment_100      -> current_contained_pct >= 100
      wfigs.last_event_age_24h   -> last_event_at older than 24h
      swpc.end_date_passed       -> payload_json end_time in past
      itd_511_work_zone.end_date_passed -> traffic_events.end_at in past
  - Active: prefix on every emitted wire; dispatcher.dispatch_scheduled_
    broadcast() honors cold-start grace, bypasses toggle path
  - On success, last_broadcast_at = now; first_broadcast_at preserved

Launched from notifications/pipeline/__init__.py:start_pipeline()
alongside BandConditionsScheduler.

adapter_config registry (+15 new keys, 43 -> 58):
  - reminders_wfigs.cadence_kind/cadence_value/channels/terminate_when
  - reminders_swpc.cadence_kind/cadence_value/channels/terminate_when
  - reminders_itd_511_work_zone.cadence_kind/cadence_value/channels/
    dow_mask/timezone/terminate_when
  - nws.duplicate_allowed_after_seconds

adapter_meta (+4 rows, 15 -> 19):
  - reminders_wfigs, reminders_swpc, reminders_itd_511_work_zone
    (pseudo-adapters carrying the reminder config)
  - itd_511_work_zone (reminder target row; reminder_enabled=1)
  - reminder_enabled flag added to wfigs/swpc (existing rows updated by
    v11.sql) and to itd_511_work_zone seed.

Tests (tests/test_reminders.py, 10 cases):
  - wfigs reminder fires past 8h cadence, stamps last_broadcast_at,
    preserves first_broadcast_at
  - reminder skipped within cadence
  - reminder skipped when containment_100, last_event_age_24h
  - swpc reminder fires (interval)
  - work_zone clock reminder fires at 08:00 Mountain on enabled DOW
  - work_zone reminder skipped when end_date_passed
  - work_zone reminder skipped outside slot window
  - reminder_enabled=0 suppresses all reminders for that adapter

tests/test_nws_dedup_relaxation.py (5 cases):
  - First sighting renders without Active: prefix
  - Re-broadcast within 3h suppressed
  - Re-broadcast after 3h allowed with Active: prefix
  - adapter_config.nws.duplicate_allowed_after_seconds override takes
    effect (1h window verified)
  - First sighting stamps first_broadcast_at=committed_at,
    last_broadcast_at=committed_at; 4h later broadcast stamps
    last_broadcast_at only, first_broadcast_at preserved

Test count: 829 -> 844 (+15 new, 0 regressions). Foundation tests
updated for new counts (REGISTRY=58, ADAPTER_META=19, schema=v11).

tests/test_adapter_config_foundation.py

@@ -54,11 +54,11 @@ def test_v6_tables_exist(fresh_db):
     assert "adapter_meta" in tables
 
 
-def test_schema_meta_at_v10(fresh_db):
+def test_schema_meta_at_v11(fresh_db):
     v = fresh_db.execute(
         "SELECT value FROM schema_meta WHERE key='version'"
     ).fetchone()["value"]
-    assert int(v) == 10
+    assert int(v) == 11
 
 
 def test_adapter_config_type_check_constrains_vocabulary(fresh_db):
@@ -73,16 +73,16 @@ def test_adapter_config_type_check_constrains_vocabulary(fresh_db):
 # ---------- registry shape -----------------------------------------------
 
 
-def test_registry_at_43_entries():
+def test_registry_at_58_entries():
     """v0.6-3a.1 trim: 43 CONFIG-only keys (was 77 in v0.6-3a draft)."""
-    assert len(REGISTRY) == 43, (
+    assert len(REGISTRY) == 58, (
         f"REGISTRY should have 43 entries after CONFIG-vs-CODE trim; got {len(REGISTRY)}. "
         f"If a sentence template / emoji / heuristic snuck in, it belongs in CODE not config."
     )
 
 
-def test_adapter_meta_at_15(fresh_db):
-    assert len(ADAPTER_META) == 15
+def test_adapter_meta_at_19(fresh_db):
+    assert len(ADAPTER_META) == 19
 
 
 # ---------- seed ----------------------------------------------------------