Merge branch 'hooks' into master

Brings in:
- W axis (auxcnc) integration via ESP32 over /dev/ttyUSB0, including
  the W axis settings panel, DRO row, jog row aligned with X/Y/Z, and
  collapsed home-only W controls.
- README + W axis docs covering macOS build/flash and the new UI.
- Build & flash docs for the Pi firmware (BUILD.md), including the
  cached gplan.so build via Docker (~30 min first time, 3 sec after).
- Hooks v2: external triggers during G-code execution that block
  unpause until the hook completes.
- V09 full UX redesign mock + implementation plan + mock variations.
- V09 implementation: new app shell with underline-ribbon tabs,
  Program / Console / Settings shells, V09 jog/macro palette, slim
  status pill replacing the old chip soup, and an octagonal STOP that
  wraps the existing <estop> SVG.
- Vue.config.async = false to fix sticky :class bindings under hash
  navigation.

# Conflicts:
#	.gitignore

.gitignore

@@ -29,3 +29,17 @@ __pycache__
 .idea/deployment.xml
 backup/*.img.gz
 backup/*.partial
+
+# Demo mode artifacts
+bbctrl.log*
+hooks.json
+/*/bbctrl.log*
+src/py/camotics/__init__.py
+src/py/camotics/gplan.so
+src/avr/emu/bbemu
+src/avr/emu/build/
+
+.pi/pi-python35.tar.gz
+src/py/camotics/gplan.so.built
+tmp/
+backup/