feat: dashcamd trip lifecycle, status indicator, CLAUDE.md updates

dashcamd now waits for valid system time + GPS fix + drive gear before
starting a trip. Returns to waiting state on 10-min park timeout or
ignition off. Publishes DashcamState and per-trip DashcamFrames to
memory params. Status window shows stopped/waiting/recording states.

Updated CLAUDE.md with current display mode behavior, OmxEncoder port
details, speed limit warning thresholds, and dashcam param docs.

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

selfdrive/manager/manager.py

@@ -88,6 +88,7 @@ def manager_init(frogpilot_functions) -> None:
   params_memory.put("TelemetryEnabled", "0")
   params_memory.put("VpnEnabled", "1")
   params_memory.put("DashcamFrames", "0")
+  params_memory.put("DashcamState", "stopped")
   params_memory.put("ModelStandby", "0")
   params_memory.put("ModelStandbyTs", "0")
   params_memory.put("CarIsMetric", "0")