Initial library + 694 generated 0402 resistor symbols

Symbols (2 libraries):
  - symbols/ultra-mini.kicad_sym
  - symbols/M8Mini.kicad_sym
  - symbols/Res_0402.kicad_sym  (R_temp template + 694 generated symbols)

Footprints (33 used in ultra project):
  - footprints/custom.pretty/   (30 mods)
  - footprints/M8Mini.pretty/   (3 mods)

3D models (31 STEP/STP files)

Scripts:
  - scripts/extract_symbols.py    KiCad 9 symbol metadata extractor
  - scripts/export_bom.py         BOM CSV exporter
  - scripts/gen_resistors_0402.py 0402 resistor symbol generator from parts list

.gitignore

@@ -0,0 +1,34 @@
+# KiCad project files (not part of the library)
+*.kicad_pro
+*.kicad_pcb
+*.kicad_sch
+*.kicad_dru
+*.kicad_prl
+fp-info-cache
+fp-lib-table
+sym-lib-table
+
+# Backups and autosaves
+*.bak
+*-bak
+_autosave-*
+*-backups/
+
+# Generated outputs
+*.csv
+*.json
+*.pdf
+*.gbr
+*.drl
+*.pos
+*.rpt
+gerbers/
+fabrication/
+
+# macOS
+.DS_Store
+
+# Python
+__pycache__/
+*.pyc
+.venv/