feat(v0.6-3b): wire every handler to adapter_config + v7.sql firms dedup_key column

Replaces module-level magic numbers in 12 handlers with reads via the
v0.6-3a.1 typed accessor. Every default matches the prior hardcoded
value exactly, so first-deploy behavior is unchanged.

Handlers wired (43 keys across the 43-row registry):

  wfigs            cooldown_seconds, anchor_max_mi, broadcast_on_acres,
                   broadcast_on_contained
  nws              broadcast_severities, tombstone_msgtypes,
                   warning_suffix_promotes
  usgs_quake       regional_centroid, regional_radius_mi,
                   broadcast_pager_alerts, global_mag_floor,
                   regional_mag_floor, escalate_mag_floor
  swpc             geomag_kp_floor (extends G-scale down to Kp 5 when
                                    lowered), flare_class_floor (R-scale
                                    extended to M-class when lowered),
                   proton_pfu_floor
  usgs_nwis        parameter_codes, broadcast_on_recede
  incident         freshness_seconds, broadcast_on_update (Update path
                                    re-implemented when toggled True:
                                    magnitude step-up / delay doubling /
                                    icon_category change)
  tomtom_incidents drop_zero_magnitude, drop_non_present
  state_511_atis   skipped_states (case-insensitive match against both
                                    state_code and primary_region suffix)
  central          severity_thresholds (immediate_min check ordered before
                                    priority_max so the +inf clamp still
                                    works)
  dispatcher       dedup_lru_max, cooldown_prune_size,
                   cooldown_prune_multiplier, dedup_db_retention_days
  band_conditions  swpc_freshness_seconds, hamqsl_url, hamqsl_timeout_s
  geocoder         (photon_url/timeout/radius/limit/town_osm_values/
                   h3_cache_max -- module-level constants kept as
                   backward-compat aliases; runtime reads via accessor)
  pipeline         Inhibitor.ttl_seconds + Grouper.window_seconds now
                   default to None, falling back to
                   adapter_config.pipeline.{inhibitor_ttl_seconds,
                   grouper_window_seconds}. Explicit constructor values
                   still win (test fixtures unchanged).
  firms            confidence_floor, frp_floor, bbox, dedup_distance_m

Schema:
  v7.sql adds firms_pixels.dedup_key column + drops the old hardcoded
  round(lat,5) UNIQUE INDEX, replaces with UNIQUE (dedup_key, acq_time,
  satellite). The firms_handler quantizes lat/lon to
  (dedup_distance_m / 111000) degrees at INSERT time -- meters-based
  precision per Matt s spec, tunable via the GUI without schema changes.

  SCHEMA_VERSION 6 -> 7. firms_pixels has 0 rows in production so no
  backfill needed.

CODE preserved (Matt s rule): sentence templates, emoji literals, the
TomTom icon_map / ITD sub_type_map / Central adapter_map / category_map
translation tables, the band_conditions Kp/SFI -> Good/Fair/Poor
heuristic, anchor-priority ordering, expires-bucket boundaries, the
NOAA G/R/S scale tables. None of these reach the GUI.

Hot-path performance: every accessor read hits the in-memory cache after
the first call; cache hit is one dict get. Per-event reads (e.g. WFIGS
cooldown_seconds on every WFIGS poll-cycle) add a single dict lookup
to existing pipelines.

Backward-compat aliases retained for module-level imports that exist in
test code: WFIGS_BROADCAST_COOLDOWN_S, FIRMS_CONFIDENCE_FLOOR,
FIRMS_FRP_FLOOR, FIRMS_BBOX_OPTIONAL, INCIDENT_FRESHNESS_MAX_S,
PHOTON_BASE_URL/TIMEOUT_S/RADIUS_KM/LIMIT. Handler code reads via
adapter_config; tests can either monkeypatch the module attribute (firms)
or mutate adapter_config DB values.

Test count: 731 -> 731 (no new tests in 3b -- handler wiring is a pure
refactor; coverage comes from the existing handler test suites passing
unchanged).

Refs audit doc v0.6-phase1-audit.md Section A + Matt s CONFIG-vs-CODE rule.

tests/test_adapter_config_foundation.py

@@ -54,11 +54,11 @@ def test_v6_tables_exist(fresh_db):
     assert "adapter_meta" in tables
 
 
-def test_schema_meta_at_v6(fresh_db):
+def test_schema_meta_at_v7(fresh_db):
     v = fresh_db.execute(
         "SELECT value FROM schema_meta WHERE key='version'"
     ).fetchone()["value"]
-    assert int(v) == 6
+    assert int(v) == 7
 
 
 def test_adapter_config_type_check_constrains_vocabulary(fresh_db):