chore: ignore build/log/scratch artefacts and dev-container helper

.gitignore

@@ -27,3 +27,19 @@ __pycache__
 *.elf
 *.hex
 .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/