dashcamd v2: native C++ process with direct camera capture

- New dashcamd: connects to camerad via VisionIPC, feeds raw NV12
  frames directly to OMX H.264 encoder. Full 1928x1208 resolution,
  4Mbps, 3-minute MP4 segments. Works regardless of UI state.
- Added encode_frame_nv12() to OmxEncoder — skips RGBA->NV12 conversion
- Suspends recording after 10 minutes of standstill
- Disabled old screen recorder timer in onroad.cc
- Suppress debug button alert (clpDebug event still fires for screen toggle)
- launch_openpilot.sh self-cleans other instances before starting
- Register DashcamDebug param in params.cc and manager.py
- Add dashcamd to build system (SConscript) and process_config
- Updated CLAUDE.md with all session changes
- Added GOALS.md feature roadmap

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

selfdrive/controls/lib/events.py

@@ -778,8 +778,8 @@ EVENTS: dict[int, dict[str, Alert | AlertCallbackType]] = {
     ET.SOFT_DISABLE: soft_disable_alert("Sensor Data Invalid"),
   },
 
+  # CLEARPILOT: alert suppressed — event still fires for screen toggle and future actions
   EventName.clpDebug: {
-    ET.PERMANENT: clp_debug_notice,
   },
 
   EventName.noGps: {