modeld standby on lat inactive, dashcamd always-on, alert suppression

- modeld: enter standby when latActive=false (not just standstill),
  exception for lane changes (no_lat_lane_change). Fix Python capnp
  property access (.latActive not getLatActive())
- controlsd: move model_suppress computation early, suppress radarFault,
  posenetInvalid, locationdTemporaryError, paramsdTemporaryError during
  model standby + 2s grace period. All cascade from modeld not publishing
- dashcamd: always_run (manages own trip lifecycle), wait for valid frame
  dimensions before encoding (fix SIGSEGV on early start)
- Fan: driving range 15-100% (was 30-100%)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

selfdrive/modeld/modeld.py

@@ -241,13 +241,17 @@ def main(demo=False):
 
     sm.update(0)
 
-    # CLEARPILOT: standstill power saving — skip inference, keep model loaded
-    standstill = sm['carState'].standstill
-    if standstill and not model_standby:
+    # CLEARPILOT: power saving — skip inference when lateral control is not active
+    # Covers standstill, manual driving (no cruise), and disengaged states
+    # Exception: keep processing during lane changes (no_lat_lane_change)
+    lat_active = sm['carControl'].latActive
+    lane_changing = params_memory.get_bool("no_lat_lane_change")
+    should_standby = not lat_active and not lane_changing
+    if should_standby and not model_standby:
       params_memory.put_bool("ModelStandby", True)
       model_standby = True
-      cloudlog.warning("modeld: standby ON (standstill)")
-    elif not standstill and model_standby:
+      cloudlog.warning("modeld: standby ON (lat_active=%s standstill=%s)", lat_active, sm['carState'].standstill)
+    elif not should_standby and model_standby:
       params_memory.put_bool("ModelStandby", False)
       model_standby = False
       run_count = 0