modeld standby, fan standstill clamping, log rotation, diagnostic logging

- modeld standby: skip inference at standstill (model stays loaded in GPU),
  ModelStandby param + ModelStandbyTs heartbeat for race-free suppression
- controlsd: suppress commIssue/modeldLagging when ModelStandbyTs < 2s old,
  ignore telemetryd/dashcamd in process_not_running check
- Fan controller: standstill below 74°C clamps to 0-10% (near silent),
  standstill above 74°C allows 0-100%, thermald reads carState.standstill
- Deleter: enforce 4GB quota on /data/log2 session logs, oldest-first cleanup
- Diagnostic logging: steerTempUnavailable and controlsdLagging log to stderr
  with full context (steering angle, torque, speed, remaining time)
- CLAUDE.md: document memory params method name difference (C++ camelCase
  vs Python snake_case)

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

CLAUDE.md

@@ -101,7 +101,8 @@ ClearPilot uses memory params (`/dev/shm/params/d/`) for UI toggles that should
 - **Python access**: Use `Params("/dev/shm/params")`
 - **Defaults**: Set in `manager_init()` via `Params("/dev/shm/params").put(key, value)`
 - **UI toggles**: Use `ToggleControl` with manual `toggleFlipped` lambda that writes via `Params("/dev/shm/params")`. Do NOT use `ParamControl` for memory params — it reads/writes persistent params only
-- **Current memory params**: `TelemetryEnabled` (default "0"), `VpnEnabled` (default "1"), `ScreenDisplayMode`
+- **Current memory params**: `TelemetryEnabled` (default "0"), `VpnEnabled` (default "1"), `ModelStandby` (default "0"), `ScreenDisplayMode`
+- **IMPORTANT — method names differ between C++ and Python**: C++ uses camelCase (`putBool`, `getBool`, `getInt`), Python uses snake_case (`put_bool`, `get_bool`, `get_int`). This is a common source of silent failures — the wrong casing compiles/runs but doesn't work.
 
 ### Building Native (C++) Processes