feat(hw): add schops tool for schematic operations and kicad-cli integration

- Introduced `kicad_cli.sh` for local and Docker-based kicad-cli execution.
- Created `schops.py` for schematic operations including ERC, BOM, netlist exports, and bulk edits.
- Added README.md for schops with installation and usage instructions.
- Included requirements.txt for necessary Python packages.
- Implemented rules engine for applying field defaults and renaming nets.
- Added tests for rules engine functionality.
- Introduced scope guard script to enforce file modification policies based on PR labels.
- Created watch script to monitor KiCad files and trigger hardware gate on changes.

firmware/test/test_basic.cpp

@@ -0,0 +1,13 @@
+#include <unity.h>
+
+static int add(int a, int b) { return a + b; }
+
+void test_add(void) {
+  TEST_ASSERT_EQUAL_INT(4, add(2, 2));
+}
+
+int main(int, char**) {
+  UNITY_BEGIN();
+  RUN_TEST(test_add);
+  return UNITY_END();
+}