feat(notifications): Phase 2.14 USGS earthquake adapter (new) -- closes Rule 16 Seismic standalone path

First net-new environmental adapter (prior phases wired existing ones).
Adds meshai/env/usgs_quake.py with USGSQuakeAdapter + USGSQuakeConfig,
polling a keyless USGS earthquake GeoJSON feed and emitting one Event per
qualifying quake. Establishes the standalone Seismic path (Rule 16);
Central becomes the dual-source in v0.4.

Adapter (mirrors the fires/usgs-water per-event pattern):
- Feed: https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson
  (M2.5+ past day -- M1.0 too noisy, M4.5+ too sparse for the region).
  Tick 300s.
- Filters each feature by min_magnitude AND a geographic bbox.
- Per quake: source=usgs_quake, category=earthquake_event, stable
  event_id = the USGS feature id (e.g. "us6000abcd"), lat/lon from
  geometry.coordinates[1],[0], region tag from config (default
  "magic_valley").
- to_event(): category earthquake_event, magnitude-binned severity passed
  through, group_key = inhibit_key = the USGS id. Defensive None for
  missing id / coords / magnitude. get_events()/health_status mirror the
  other adapters.

MAGNITUDE -> SEVERITY BINS (as proposed):
  M < 3.5        -> routine
  3.5 <= M < 5.0 -> priority
  M >= 5.0       -> immediate
('sig' is captured in the event dict as metadata but severity is
magnitude-binned -- clearer and matches the spec's primary suggestion.)

GEOGRAPHIC BBOX (as proposed) -- [west, south, east, north]:
  [-115.5, 42.0, -110.0, 45.2]
Covers Magic Valley / Twin Falls (SW), the Lost River Range / Borah Peak
and Sawtooths (central Idaho, seismically active -- 1983 M6.9), the eastern
Snake River Plain / INL, and the Yellowstone caldera (NW Wyoming). An empty
bbox disables the geographic filter (accepts all).

Wiring:
- config.py: new USGSQuakeConfig dataclass; usgs_quake field on
  EnvironmentalConfig; loader branch in _dict_to_dataclass.
- store.py __init__: registers self._adapters["usgs_quake"] when enabled --
  this is what grows the live adapter count 7 -> 8.
- store._ingest: NO dedicated branch added. usgs_quake is a standard
  per-event adapter, so the existing generic "else" loop (dedup on
  (source, event_id) + _emit_event) already routes it. (The swpc/ducting
  branches are special only because they also maintain status blobs.)
- env_feeds.yaml (live /data/config): added usgs_quake block, enabled:true,
  default bbox/min_mag/region.

Rule 17: GUI-editable config (env_feeds.yaml). Rule 18 N/A -- USGS
earthquake feed is keyless (no .env entry; .ref credentials has no
USGS/ArcGIS/quake key). Rule 16: standalone path established + validated
in-container.

Tests: tests/test_adapter_usgs_quake.py (15 tests) mirrors the 2.12/2.13
shape -- severity bins, _fetch severity assignment, magnitude filter,
geographic filter (in-bbox vs California/out), empty-bbox-accepts-all,
dedup id stable across ticks for the same quake id, category, severity
pass-through, group_key/inhibit_keys, field population, defensive cases
(missing id/coords/magnitude/corrupted -> None), and malformed-feature
skipping. _fetch tests patch urlopen with synthetic FeatureCollections.
Full suite: 248 passed.

Live smoke test (prod container, rebuilt): clean startup, adapter count
grew 7 -> 8 ("EnvironmentalStore initialized with 8 adapters"), healthy,
no traceback, no usgs_quake errors. In-container standalone tick over the
real feed succeeded (is_loaded=true, last_error=null,
consecutive_errors=0); the feed returned 54 global M2.5+ quakes, 0 inside
the Magic Valley->Yellowstone bbox right now (quiet) -- so no Event is
emitted, acceptable, and it exercises the fetch + magnitude + geographic
filter + no-emit path on live data. The emission path (in-region quake ->
earthquake_event) is unit-validated and uses the same store->bus path
emitting live for NWS, traffic, and NIFC fires.

Note (.gitignore): line 36 `env/` (a virtualenv pattern under "Virtual
environments") collaterally matches meshai/env/, so this NEW file required
`git add -f` (untracked files there are otherwise ignored and hidden from
status). Existing tracked env files are unaffected. Recommended follow-up:
anchor the rule to `/env/` so future net-new env adapters don't need -f.

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

meshai/config.py

@@ -377,6 +377,19 @@ class USGSConfig:
     flood_thresholds: dict = field(default_factory=dict)  # {site_id: {flow: X, height: Y}}
 
 
+@dataclass
+class USGSQuakeConfig:
+    """USGS earthquake feed settings (Phase 2.14)."""
+
+    enabled: bool = False
+    tick_seconds: int = 300
+    feed_url: str = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson"
+    min_magnitude: float = 2.5
+    # [west, south, east, north] -- Magic Valley -> Borah Peak -> Yellowstone
+    bbox: list = field(default_factory=lambda: [-115.5, 42.0, -110.0, 45.2])
+    region: str = "magic_valley"
+
+
 @dataclass
 class TomTomConfig:
     """TomTom traffic flow settings."""
@@ -425,6 +438,7 @@ class EnvironmentalConfig:
     fires: NICFFiresConfig = field(default_factory=NICFFiresConfig)
     avalanche: AvalancheConfig = field(default_factory=AvalancheConfig)
     usgs: USGSConfig = field(default_factory=USGSConfig)
+    usgs_quake: USGSQuakeConfig = field(default_factory=USGSQuakeConfig)
     traffic: TomTomConfig = field(default_factory=TomTomConfig)
     roads511: Roads511Config = field(default_factory=Roads511Config)
     firms: FIRMSConfig = field(default_factory=FIRMSConfig)
@@ -673,6 +687,8 @@ def _dict_to_dataclass(cls, data: dict):
             kwargs[key] = _dict_to_dataclass(AvalancheConfig, value)
         elif key == "usgs" and isinstance(value, dict):
             kwargs[key] = _dict_to_dataclass(USGSConfig, value)
+        elif key == "usgs_quake" and isinstance(value, dict):
+            kwargs[key] = _dict_to_dataclass(USGSQuakeConfig, value)
         elif key == "traffic" and isinstance(value, dict):
             kwargs[key] = _dict_to_dataclass(TomTomConfig, value)
         elif key == "roads511" and isinstance(value, dict):