modeld: revert to constant 20fps (except standby at standstill)

Disabled the variable-rate (4/10/20fps) logic — it caused persistent
downstream freq/valid cascades that broke paramsd's angle-offset
learner, calibrationd, and locationd's one-shot filterInitialized latch.
Symptom: user's "TAKE CONTROL IMMEDIATELY / Communication Issue"
banner during engaged driving, plus subtle right-pull (paramsd's fast
angle-offset adaptation was frozen all session).

Simpler model now:
  standstill → standby (0fps, paused)
  otherwise  → 20fps (no variable rate)

Republish-caching and FPCC.latRequested/noLatLaneChange plumbing left in
place so re-enabling variable rate later is a one-line change
(full_rate = True → the original full_rate expression).

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

cereal/services.py

@@ -30,7 +30,7 @@ services: dict[str, tuple] = {
   "temperatureSensor": (True, 2., 200),
   "temperatureSensor2": (True, 2., 200),
   "gpsNMEA": (True, 9.),
-  "deviceState": (True, 4., 1),  # CLEARPILOT: 4Hz (was 2Hz) — thermald DT_TRML=0.25
+  "deviceState": (True, 5., 1),  # CLEARPILOT: 5Hz — thermald decimates pandaStates (10Hz) every 2 ticks
   "can": (True, 100., 1223),  # decimation gives ~5 msgs in a full segment
   "controlsState": (True, 100., 10),
   "pandaStates": (True, 10., 1),
@@ -70,7 +70,7 @@ services: dict[str, tuple] = {
   "wideRoadEncodeIdx": (False, 20., 1),
   "wideRoadCameraState": (True, 20., 20),
   "modelV2": (True, 20., 40),
-  "managerState": (True, 4., 1),  # CLEARPILOT: 4Hz (was 2Hz) — gated by deviceState arrival
+  "managerState": (True, 5., 1),  # CLEARPILOT: 5Hz — gated by deviceState arrival (see thermald)
   "uploaderState": (True, 0., 1),
   "navInstruction": (True, 1., 10),
   "navRoute": (True, 0.),