GPS fix + log directory redesign + dashcamd binary

GPS: fix AT response parsing (strip mmcli `response: '...'` wrapper),
fix capnp field names (horizontalAccuracy, hasFix), set system clock
directly from first GPS fix when time is invalid, kill system gpsd on
startup.

Logging: replace module-level log dir creation with init_log_dir()
called from manager_init(). Active session always at /data/log2/current
(real dir until time resolves, then symlink to timestamped dir). Add
LogDirInitialized param. Redirect both stdout+stderr for all processes.

Also: thorough process cleanup in launch scripts, dashcamd binary,
CLAUDE.md updates for GPS/telemetry/bench/logging docs.

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

build_only.sh

@@ -7,11 +7,14 @@
 
 BASEDIR="/data/openpilot"
 
-# Kill stale error displays and any running manager/launch processes
-pkill -f "selfdrive/ui/text" 2>/dev/null
-pkill -f 'launch_openpilot.sh' 2>/dev/null
-pkill -f 'launch_chffrplus.sh' 2>/dev/null
-pkill -f 'python.*manager.py' 2>/dev/null
+# Kill stale error displays and any running manager/launch/managed processes
+pkill -9 -f "selfdrive/ui/text" 2>/dev/null
+pkill -9 -f 'launch_openpilot.sh' 2>/dev/null
+pkill -9 -f 'launch_chffrplus.sh' 2>/dev/null
+pkill -9 -f 'python.*manager.py' 2>/dev/null
+pkill -9 -f 'selfdrive\.' 2>/dev/null
+pkill -9 -f 'system\.' 2>/dev/null
+pkill -9 -f './ui' 2>/dev/null
 sleep 1
 
 source "$BASEDIR/launch_env.sh"