Add portal web simulator, SPI bridges, and Pico firmware updates.

Bring the five-panel hex portal online with a browser 3D/schematic preview, Pi SPI backends, and renamed multi-panel Pico UDP firmware.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -3,5 +3,12 @@ __pycache__/
 *.py[cod]
 *.egg-info/
 .pytest_cache/
-firmware/panel/build/
-firmware/_deps/
+.mypy_cache/
+.ruff_cache/
+dist/
+build/
+*.egg
+.DS_Store
+Thumbs.db
+firmware/pico/build/
+*.uf2