feat(tomtom_incidents): TomTom real-time traffic incidents adapter (v0.9.5)

Fourth CENTRAL_TRAFFIC event adapter. Complements wzdx (federal work zones) and
state_511_atis (state-DOT reports) with TomTom commercial vehicle-telematics
coverage. Polls the Orbis incidentDetails endpoint per metro bbox, emits one
event per incident to central.traffic.incident.<state>. Ships disabled.

central-supervisor + central-gui restart only -- adapter row on the EXISTING
CENTRAL_TRAFFIC stream, so NO archive restart and no new stream/dependency.
Reuses the existing "tomtom" api key.

- Bbox limit refutation: incidentDetails rejects bbox > 10,000 km^2, so coverage
  is per-metro bboxes (Treasure Valley / Boise, 8,601 km^2), NOT statewide. One
  bbox @ 1800s = 1,440 calls/mo = 58% of the 2,500/mo free-tier cap. Expansion
  rows must respect N*(43200/cadence_min) <= 2500.
- category="incident.tomtom_incidents" -> GUI event_type "incident" (shared with
  state_511_atis; cross-source overlap is by design = additive coverage, distinct
  dedup ids + categories, no Central-side cross-source dedup).
- Severity from magnitudeOfDelay (0->1,1->1,2->2,3->3,4->4; 4=closure). Never None.
- geo.geometry carries TomTom's Point/LineString directly (already lon/lat GeoJSON;
  the v0.9.3 framework renders the affected road as a polyline). No decode needed.
- Dedup id <state_code>:tomtom:<tomtom_id> (upstream id stable across polls,
  verified 154/154 over 60s). Inherits the v0.9.1 dedup mixin.
- aiohttp params= URL-encodes the fields{} GraphQL braces (no curl-glob issue);
  key redacted from logs; poll skips cleanly without a key.

Full suite: 809 passed, 1 skipped (central and unprivileged zvx, 3x each).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_events_feed_frontend.py

@@ -1145,6 +1145,7 @@ _SAMPLE_INNER = {
     "wzdx": {"road_names": ["I-80"], "direction": "eastbound"},
     "state_511_atis": {"layer": "Incidents", "roadway_name": "US-95", "location_description": "Ponderosa Mobile Home Park"},
     "tomtom_flow": {"road_category": "primary", "relative_speed": 0.11},
+    "tomtom_incidents": {"description": "Roadworks", "from": "Early Road", "to": "Slade Road"},
 }
 
 # Exact expected subjects for the deterministic adapters. swpc_alerts is omitted
@@ -1165,6 +1166,7 @@ _EXPECTED_SUBJECT = {
     "wfigs_perimeters": "Wildfire perimeter — Carbon, MT",
     "wzdx": "Work zone on I-80 eastbound",
     "tomtom_flow": "Traffic flow (primary) — 11% of free-flow",
+    "tomtom_incidents": "Roadworks on Early Road → Slade Road",
 }