fix(central): use LAST_PER_SUBJECT and filter non-WF incidents

- consumer.py: change DeliverPolicy from NEW to LAST_PER_SUBJECT to
  get latest state per subject on reconnect instead of replaying backlog
- central_normalizer.py: drop RX and non-wildfire (non-WF) incident
  types early in _parse_wfigs_incidents before they reach the handler

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

meshai/central/consumer.py

@@ -33,7 +33,7 @@ def consumer_config():
     msgs for high-volume streams like traffic_flow).
     """
     from nats.js.api import ConsumerConfig, DeliverPolicy
-    return ConsumerConfig(deliver_policy=DeliverPolicy.NEW)
+    return ConsumerConfig(deliver_policy=DeliverPolicy.LAST_PER_SUBJECT)
 
 
 # Bare-wildcard subjects, pre-v0.9.20. Still used when `central.region` is

meshai/central_normalizer.py

@@ -676,6 +676,8 @@ def _parse_wfigs_incidents(inner_data: dict, geo: dict) -> dict:
     irwin_id = inner_data.get("IrwinID") or inner_data.get("irwin_id")
     name = inner_data.get("IncidentName")
     itype = inner_data.get("IncidentTypeCategory")
+    if itype is not None and itype != "WF":
+        return None
     lat = inner_data.get("latitude")
     lon = inner_data.get("longitude")
     county = inner_data.get("POOCounty")