feat(central): v0.5.3 -- roads511 + FIRMS central feeds with sub-adapter routing (recover stashed v0.5.1)

C.2 (v0.4) marked roads511 and FIRMS native-only in the dashboard despite the
Central event bus shipping both stream families. This recovers the v0.5.1
work paused before the v0.5.2 spam fix and lands it cleanly on top of v0.5.2.

Backend (meshai/central/consumer.py):
- ADAPTER_SUBJECTS: roads511 now subscribes to central.traffic.> (shared
  with the existing traffic adapter); firms widened from
  central.fire.hotspot.> to central.fire.>.
- CENTRAL_ADAPTER_TO_SOURCE: three new sub-adapter remaps so the inner
  envelope.adapter routes correctly inside a shared subject --
  tomtom_incidents -> traffic, state_511_atis -> roads511, firms -> firms.
- New _subject_owned() -> dict[subject_filter, set[meshai_source]]:
  builds the per-subject ownership set so a single central.traffic.>
  subscription can be owned by {traffic, roads511} simultaneously.
- subjects() now derives from _subject_owned().keys().
- _make_cb(owned) binds the owned set per-subscription; _on_message
  forwards it.
- _handle(subject, raw, owned=None) drops events whose remapped source
  isn't in the owned set (silent debug log). Enabling roads511 alone
  no longer accidentally consumes wzdx; enabling traffic alone no
  longer consumes state_511_atis.
- start() subscribes per (subject, owned) tuple; per-subject log line
  records the owned sources at startup.
- Removed roads511 from the "no Central mapping" warning loop now that
  it has one.

Frontend (dashboard-frontend/src/pages/Environment.tsx):
- roads511 META entry: hasCentral false -> true, nativeOnly true -> false
  (the FIRMS entry was already correct).
- Static bundle rebuilt via npm run build; old index-CfYlhn4e.js dropped,
  new index-DCFmSeOM.js + index-DjhQa8Mv.css land under static/assets;
  index.html updated to the new bundle hash.

Tests (tests/test_central_sub_adapter_routing.py, 8 new):
- roads511-only drops wzdx; emits state_511_atis as source=roads511.
- traffic+roads511 both central: wzdx -> traffic, state_511_atis -> roads511.
- firms-only drops wfigs_incidents; emits hotspots as source=firms.
- tomtom_incidents remaps to traffic.
- _subject_owned() shares central.traffic.> across {traffic, roads511}.

Orthogonal to v0.5.2's dispatcher guards: cooldown / dedup / staleness still
apply downstream of the consumer; the owned-sources filter operates one
layer up at message ingest. No changes to the dispatcher path.

Verified: pytest 318 passed (310 prior + 8 new routing tests); py_compile clean.
Safe-mode preserved -- no toggle enabled, no master enabled, no central enabled.

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

dashboard-frontend/src/pages/Environment.tsx

@@ -165,7 +165,7 @@ const META: Record<AdapterKey, AdapterMeta> = {
   swpc: { label: 'NOAA Space Weather (SWPC)', subtitle: 'Solar indices, geomagnetic storms', health: 'swpc', hasCentral: true, nativeOnly: false, hasKey: true },
   ducting: { label: 'Tropospheric Ducting', subtitle: 'VHF/UHF extended-range conditions', health: 'ducting', hasCentral: false, nativeOnly: true, hasKey: true },
   traffic: { label: 'TomTom Traffic', subtitle: 'Traffic flow on monitored corridors', health: 'traffic', hasCentral: true, nativeOnly: false, hasKey: true },
-  roads511: { label: '511 Road Conditions', subtitle: 'State DOT road events and closures', health: 'roads511', hasCentral: false, nativeOnly: true, hasKey: false },
+  roads511: { label: '511 Road Conditions', subtitle: 'State DOT road events and closures', health: 'roads511', hasCentral: true, nativeOnly: false, hasKey: false },
   usgs_quake: { label: 'USGS Earthquakes', subtitle: 'Seismic events from the USGS feed', health: 'usgs_quake', hasCentral: true, nativeOnly: false, hasKey: true },
   usgs: { label: 'USGS Stream Gauges', subtitle: 'River and stream water levels', health: 'usgs', hasCentral: true, nativeOnly: false, hasKey: true },
   avalanche: { label: 'Avalanche Advisories', subtitle: 'Backcountry avalanche danger ratings', health: 'avalanche', hasCentral: false, nativeOnly: true, hasKey: true },