Add live-tunable GPS solver highway weight

tools/write_solver_weights.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+"""Write EdgeWeightGPS solver highway presets as one raw float32 value."""
+
+from __future__ import annotations
+
+import argparse
+import struct
+from pathlib import Path
+
+
+DEFAULT_INSTALL_PATH = Path(
+    "/var/home/salt/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/common/"
+    "Cyberpunk 2077/red4ext/plugins/EdgeWeightGPS/solver_weights.bin"
+)
+
+PRESETS: dict[str, float] = {
+    "vanilla": 1.00,
+    "default": 0.80,
+    "mild": 0.90,
+    "strong": 0.70,
+    "proof-highway-cheap": 0.35,
+    "highway-expensive": 3.00,
+}
+
+
+def parse_multiplier(text: str) -> float:
+    value = float(text)
+    if not 0.0 < value < 20.0:
+        raise argparse.ArgumentTypeError("multiplier must be greater than 0 and less than 20")
+    return value
+
+
+def write_weight(path: Path, value: float) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_bytes(struct.pack("<f", value))
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("preset", nargs="?", choices=sorted(PRESETS), default="default")
+    parser.add_argument("--value", type=parse_multiplier, help="explicit highway multiplier")
+    parser.add_argument("--output", type=Path, default=DEFAULT_INSTALL_PATH)
+    parser.add_argument("--preset-dir", type=Path, help="write every named preset into this directory")
+    args = parser.parse_args()
+
+    if args.preset_dir:
+        for name, value in PRESETS.items():
+            path = args.preset_dir / f"{name}.bin"
+            write_weight(path, value)
+            print(f"{path}: {value}")
+        return 0
+
+    value = args.value if args.value is not None else PRESETS[args.preset]
+    write_weight(args.output, value)
+    print(f"{args.output}: {value}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())