Add LVSolarBuck64 firmware and debug console with uv support

STM32G474RB firmware for solar buck converter with MPPT, CC control,
Vfly compensation, and adaptive deadtime. Includes Textual TUI debug
console for real-time telemetry, parameter tuning, and SQLite logging.

Added pyproject.toml for uv: `cd code64 && uv run debug-console`

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

code64/debug_console/__main__.py

@@ -0,0 +1,48 @@
+"""Entry point: python -m debug_console [COM_PORT] [baudrate]"""
+import sys
+
+import serial.tools.list_ports
+
+from .app import DebugConsoleApp
+
+
+def select_port() -> str:
+    ports = sorted(serial.tools.list_ports.comports(), key=lambda p: p.device)
+    if not ports:
+        print("No COM ports found.")
+        sys.exit(1)
+
+    print("Available COM ports:")
+    for i, p in enumerate(ports):
+        desc = f" - {p.description}" if p.description and p.description != p.device else ""
+        print(f"  [{i}] {p.device}{desc}")
+
+    while True:
+        choice = input(f"\nSelect port [0-{len(ports)-1}]: ").strip()
+        try:
+            idx = int(choice)
+            if 0 <= idx < len(ports):
+                return ports[idx].device
+        except ValueError:
+            # Allow typing the port name directly
+            for p in ports:
+                if choice.upper() == p.device.upper():
+                    return p.device
+        print("Invalid selection, try again.")
+
+
+def main():
+    if len(sys.argv) >= 2:
+        port = sys.argv[1]
+    else:
+        port = select_port()
+
+    baudrate = int(sys.argv[2]) if len(sys.argv) > 2 else 460800
+
+    print(f"Connecting to {port} at {baudrate} baud...")
+    app = DebugConsoleApp(port, baudrate)
+    app.run()
+
+
+if __name__ == "__main__":
+    main()