fix(build): port build scripts to Python to allow Windows contributors to build subprojects (#83)

* Rewrite build-version and all build-zip bash scripts to python

* Add executable permissions to python build scripts

* Use python build script for kmod in CI

* Fix

* Enhance kmod build script, add/fix docs, CI edits

* Delete remaining build-zip bash scripts

* Delete remaining build-zip bash scripts

scripts/build_lib.py

@@ -0,0 +1,50 @@
+"""Shared helpers for build scripts.
+
+Used by kmod/build-zip.py, portshide/build-zip.py, and zygisk/build-zip.py.
+"""
+
+from __future__ import annotations
+
+import os
+import zipfile
+from pathlib import Path
+
+
+def get_python_exe() -> str:
+    """Return 'python' on Windows, 'python3' elsewhere."""
+    return "python" if os.name == "nt" else "python3"
+
+
+def make_zip(source_dir: Path, output_zip: Path) -> None:
+    """Create a zip archive from source_dir contents."""
+    with zipfile.ZipFile(output_zip, "w", zipfile.ZIP_DEFLATED) as zf:
+        for file_path in source_dir.rglob("*"):
+            if file_path.is_file():
+                arcname = file_path.relative_to(source_dir)
+                zf.write(file_path, arcname)
+
+
+def get_build_version(repo_root: Path | None = None) -> str:
+    """Get the effective build version for vpnhide artifacts.
+
+    - HEAD on a tag vX.Y.Z        -> "X.Y.Z"          (release build)
+    - N commits after tag vX.Y.Z  -> "X.Y.Z-N-gSHA"   (dev build)
+    - working tree dirty          -> additional "-dirty" suffix
+    - no git / no matching tag    -> falls back to VERSION file
+    """
+    import subprocess
+
+    if repo_root is None:
+        repo_root = Path(__file__).resolve().parent.parent
+
+    result = subprocess.run(
+        ["git", "describe", "--tags", "--match", "v*", "--dirty"],
+        cwd=repo_root,
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode == 0 and result.stdout.strip():
+        return result.stdout.strip().removeprefix("v")
+
+    version_file = repo_root / "VERSION"
+    return version_file.read_text(encoding="utf-8").strip()