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>

system/loggerd/deleter.py

@@ -101,6 +101,39 @@ def delete_oldest_video():
     return False
 
 
+# CLEARPILOT: max total size for /data/log2 session logs
+LOG2_MAX_BYTES = 4 * 1024 * 1024 * 1024
+
+def cleanup_log2():
+  """Delete oldest session log directories until /data/log2 is under LOG2_MAX_BYTES."""
+  log_base = "/data/log2"
+  if not os.path.isdir(log_base):
+    return
+  # Get all session dirs sorted oldest first (by name = timestamp)
+  dirs = []
+  for entry in sorted(os.listdir(log_base)):
+    if entry == "current":
+      continue
+    path = os.path.join(log_base, entry)
+    if os.path.isdir(path) and not os.path.islink(path):
+      size = sum(f.stat().st_size for f in os.scandir(path) if f.is_file())
+      dirs.append((entry, path, size))
+  total = sum(s for _, _, s in dirs)
+  # Also count current session
+  current = os.path.join(log_base, "current")
+  if os.path.isdir(current):
+    total += sum(f.stat().st_size for f in os.scandir(current) if f.is_file())
+  # Delete oldest until under quota
+  while total > LOG2_MAX_BYTES and dirs:
+    entry, path, size = dirs.pop(0)
+    try:
+      cloudlog.info(f"deleting log session {path} ({size // 1024 // 1024} MB)")
+      shutil.rmtree(path)
+      total -= size
+    except OSError:
+      cloudlog.exception(f"issue deleting log {path}")
+
+
 def deleter_thread(exit_event):
   while not exit_event.is_set():
     out_of_bytes = get_available_bytes(default=MIN_BYTES + 1) < MIN_BYTES
@@ -135,6 +168,8 @@ def deleter_thread(exit_event):
           cloudlog.exception(f"issue deleting {delete_path}")
       exit_event.wait(.1)
     else:
+      # CLEARPILOT: enforce log2 size quota even when disk space is fine
+      cleanup_log2()
       exit_event.wait(30)