Initial project scaffold for CH9350-STM32 USB HID to UART bridge

.gitignore

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+# Build outputs (generated by `ato build`)
+build/
+
+# Dependency packages (fetched by `ato install`)
+elec/src/generics/
+
+# .ato cache/config
+.ato/
+
+# KiCAD temp & backup files
+*.000
+*.bak
+*.bck
+*.kicad_pcb-bak
+*.kicad_sch-bak
+*-backups
+*.kicad_prl
+*.sch-bak
+*~
+_autosave-*
+*.tmp
+*-save.pro
+*-save.kicad_pcb
+*.kicad_pcb.lck
+fp-info-cache
+
+# Exported BOM / netlist
+*.csv
+*.net
+*.xml
+*.dsn
+*.ses
+
+# OS junk
+.DS_Store
+Thumbs.db
+
+# Virtual environment
+.venv/
+venv/
+__pycache__/
+*.pyc
+
+# IDE
+.vscode/
+.idea/