feat(notifications): Phase 2.6 NWS adapter pipeline integration

Wires the NWS adapter to the new notification pipeline via EventBus:

- Added fine-grained weather categories: weather_watch, weather_advisory,
  weather_statement (all routine severity) alongside existing weather_warning
- NWSAlertsAdapter._derive_category() maps NWS event type suffix to category:
  "Warning" -> weather_warning, "Watch" -> weather_watch, etc.
- NWSAlertsAdapter.to_event() converts internal event dict to pipeline Event
  with proper group_key (event_id) and inhibit_keys (Warning suppresses Watch)
- EnvironmentalStore accepts optional event_bus parameter
- EnvironmentalStore._ingest() emits new events to bus via _emit_event()
- 22 new tests in test_adapter_nws.py covering category derivation,
  severity mapping, and Event field population

All 119 tests pass.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

meshai/env/nws.py

@@ -4,10 +4,12 @@ import json
 import logging
 import time
 from datetime import datetime
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Optional
 from urllib.error import HTTPError, URLError
 from urllib.request import Request, urlopen
 
+from meshai.notifications.events import Event, make_event
+
 if TYPE_CHECKING:
     from ..config import NWSConfig
 
@@ -39,6 +41,71 @@ class NWSAlertsAdapter:
         else:  # moderate, minor, unknown
             return "routine"
 
+    def _derive_category(self, event_type: str) -> str:
+        """Derive notification category from NWS event type suffix.
+
+        NWS event types like "Red Flag Warning", "Winter Storm Watch",
+        "Wind Advisory" map to our fine-grained weather categories.
+
+        Args:
+            event_type: NWS event type string (e.g., "Tornado Warning")
+
+        Returns:
+            Category key: weather_warning, weather_watch, weather_advisory,
+            or weather_statement
+        """
+        event_type_lower = event_type.lower()
+        if event_type_lower.endswith("warning"):
+            return "weather_warning"
+        elif event_type_lower.endswith("watch"):
+            return "weather_watch"
+        elif event_type_lower.endswith("advisory"):
+            return "weather_advisory"
+        else:
+            # Covers "Special Weather Statement", "Short Term Forecast", etc.
+            return "weather_statement"
+
+    def to_event(self, raw: dict) -> Event:
+        """Convert internal event dict to pipeline Event.
+
+        Args:
+            raw: Internal event dict from get_events()
+
+        Returns:
+            Event instance ready for EventBus emission
+        """
+        event_type = raw.get("event_type", "Unknown")
+        category = self._derive_category(event_type)
+        nws_severity = raw.get("severity", "unknown")
+        severity = self._map_nws_severity(nws_severity)
+
+        # Build group_key for dedup: same alert ID should merge
+        group_key = raw.get("event_id", "")
+
+        # Build inhibit_keys: a Warning supersedes Watch/Advisory for same hazard
+        inhibit_keys = []
+        if category == "weather_warning":
+            # Warning inhibits corresponding Watch/Advisory
+            base = event_type.rsplit(" ", 1)[0] if " " in event_type else event_type
+            inhibit_keys = [f"nws:{base} Watch", f"nws:{base} Advisory"]
+
+        return make_event(
+            source="nws",
+            category=category,
+            severity=severity,
+            title=raw.get("headline", event_type),
+            summary=raw.get("headline", ""),
+            body=raw.get("description", ""),
+            effective=raw.get("onset") or None,
+            expires=raw.get("expires") or None,
+            lat=raw.get("lat"),
+            lon=raw.get("lon"),
+            nws_zones=raw.get("areas", []),
+            group_key=group_key,
+            inhibit_keys=inhibit_keys,
+            data=raw,
+        )
+
     def tick(self) -> bool:
         """Execute one polling tick.
 

meshai/env/store.py

@@ -2,10 +2,11 @@
 
 import logging
 import time
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Optional
 
 if TYPE_CHECKING:
     from ..config import EnvironmentalConfig
+    from ..notifications.pipeline import EventBus
 
 logger = logging.getLogger(__name__)
 
@@ -13,9 +14,15 @@ logger = logging.getLogger(__name__)
 class EnvironmentalStore:
     """Cache and tick-driver for all environmental feed adapters."""
 
-    def __init__(self, config: "EnvironmentalConfig", region_anchors: list = None):
+    def __init__(
+        self,
+        config: "EnvironmentalConfig",
+        region_anchors: list = None,
+        event_bus: Optional["EventBus"] = None,
+    ):
         self._adapters = {}  # name -> adapter instance
         self._events = {}  # (source, event_id) -> event dict
+        self._event_bus = event_bus  # Pipeline EventBus for emission
         self._swpc_status = {}  # Kp/SFI/scales snapshot
         self._ducting_status = {}  # tropo ducting assessment
         self._mesh_zones = config.nws_zones or []
@@ -87,12 +94,29 @@ class EnvironmentalStore:
             self._swpc_status = adapter.get_status()
             # Also ingest any alert events (R-scale >= 3)
             for evt in adapter.get_events():
-                self._events[(evt["source"], evt["event_id"])] = evt
+                key = (evt["source"], evt["event_id"])
+                is_new = key not in self._events
+                self._events[key] = evt
+                if is_new and self._event_bus and hasattr(adapter, "to_event"):
+                    self._emit_event(adapter, evt)
         elif name == "ducting":
             self._ducting_status = adapter.get_status()
         else:
             for evt in adapter.get_events():
-                self._events[(evt["source"], evt["event_id"])] = evt
+                key = (evt["source"], evt["event_id"])
+                is_new = key not in self._events
+                self._events[key] = evt
+                if is_new and self._event_bus and hasattr(adapter, "to_event"):
+                    self._emit_event(adapter, evt)
+
+    def _emit_event(self, adapter, raw_evt: dict):
+        """Convert raw event to pipeline Event and emit to bus."""
+        try:
+            event = adapter.to_event(raw_evt)
+            self._event_bus.emit(event)
+            logger.debug("Emitted %s event %s to pipeline", event.source, event.id)
+        except Exception as e:
+            logger.warning("Failed to emit event to pipeline: %s", e)
 
     def _purge_expired(self):
         """Remove expired events."""

meshai/notifications/categories.py

@@ -174,12 +174,33 @@ ALERT_CATEGORIES = {
 
     # Environmental - Weather
     "weather_warning": {
-        "name": "Severe Weather",
-        "description": "NWS warning or advisory affecting your mesh area",
+        "name": "Severe Weather Warning",
+        "description": "NWS Warning affecting your mesh area — highest urgency weather alert",
         "default_severity": "priority",
         "example_message": "⚠ Red Flag Warning — Twin Falls, Cassia counties. Gusty winds, low humidity. Until May 13 04:00Z",
         "toggle": "weather",
     },
+    "weather_watch": {
+        "name": "Weather Watch",
+        "description": "NWS Watch affecting your mesh area — conditions favorable for hazardous weather",
+        "default_severity": "routine",
+        "example_message": "⏳ Winter Storm Watch — Wood River Valley. Heavy snow possible Thu night through Fri.",
+        "toggle": "weather",
+    },
+    "weather_advisory": {
+        "name": "Weather Advisory",
+        "description": "NWS Advisory affecting your mesh area — weather may cause inconvenience",
+        "default_severity": "routine",
+        "example_message": "ℹ Wind Advisory — Magic Valley. SW winds 25-35 mph with gusts to 50 mph.",
+        "toggle": "weather",
+    },
+    "weather_statement": {
+        "name": "Weather Statement",
+        "description": "NWS Special Weather Statement — general awareness, no specific hazard",
+        "default_severity": "routine",
+        "example_message": "📋 Special Weather Statement — Isolated thunderstorms possible this afternoon.",
+        "toggle": "weather",
+    },
 
     # Environmental - Space Weather
     "hf_blackout": {