Initial commit: MIKILAB KiCad personal library

Self-contained KiCad library (symbols, footprints, 3D models, docs,
import/check tooling) with no dependency on kicad-personal-library.

- Fixed sym-lib-table/fp-lib-table: single (version 7) header, one entry
  per library, MIKILAB_<name> nicknames, ${KIPRJMOD}-relative URIs
- Resolved the SOT95P280X145-5N footprint collision (TPS7A2012PDBVR vs
  TPS7A2018PDBVR): confirmed byte-identical modulo KiCad's internal
  tedit timestamp, unified into one shared footprint
- Resolved a case-insensitive filename collision between the official
  Diode.kicad_sym and a custom diode.kicad_sym
- Wrapped standalone footprints (ESP32-S31-WROOM-3, IC_TPS63020DSJT,
  SOT95P280X145-5N) into their own .pretty libraries so they're
  actually registered in fp-lib-table
- Fixed broken symbol->footprint references (including one pointing at
  a nonexistent easyeda2kicad library)
- Added scripts/check_library.py, import_component.py, add_component.py,
  import_batch.py, and lib_common.py

scripts/add_component.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+"""
+add_component.py
+=================
+
+The simple, one-command way to add a component to the MIKILAB library.
+
+    python3 scripts/add_component.py \\
+        --name TPS7A2018PDBVR \\
+        --symbol /path/to/TPS7A2018PDBVR.kicad_sym \\
+        --footprint /path/to/SOT95P280X145-5N.kicad_mod \\
+        --model /path/to/TPS7A2018PDBVR.step \\
+        --category power
+
+This does not reimplement anything: it is a thin, friendlier front-end
+over import_component.py's core logic (same validation, same collision
+handling, same lib-table regeneration). Use import_component.py directly
+if you want the more explicit/verbose interface.
+"""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent))
+
+import import_component
+
+
+def main() -> int:
+    return import_component.main()
+
+
+if __name__ == "__main__":
+    sys.exit(main())