Fix Windows git commit ValueError: embedded null character.

Use git commit -F and strip NULs from argv/version strings (0.3.7).

Co-authored-by: Cursor <cursoragent@cursor.com>

export1c_help/wiki.py

@@ -3,8 +3,10 @@
 from __future__ import annotations
 
 import json
+import os
 import shutil
 import subprocess
+import tempfile
 from pathlib import Path
 
 from export1c_help.fscompat import copy_file, ensure_dir, remove_file
@@ -18,21 +20,56 @@ class WikiPushError(RuntimeError):
     pass
 
 
+def _clean_arg(value: str | Path) -> str:
+    """Windows CreateProcess rejects argv/cwd strings that contain NUL."""
+    s = os.fspath(value)
+    if "\0" in s:
+        s = s.replace("\0", "")
+    return s
+
+
 def _run(cmd: list[str], *, cwd: Path) -> str:
+    clean_cmd = [_clean_arg(a) for a in cmd]
+    clean_cwd = _clean_arg(cwd.resolve())
     proc = subprocess.run(
-        cmd,
-        cwd=cwd,
+        clean_cmd,
+        cwd=clean_cwd,
         capture_output=True,
         text=True,
+        encoding="utf-8",
+        errors="replace",
         check=False,
     )
     if proc.returncode != 0:
         raise WikiPushError(
-            f"$ {' '.join(cmd)}\n{proc.stdout}\n{proc.stderr}".strip()
+            f"$ {' '.join(clean_cmd)}\n{proc.stdout}\n{proc.stderr}".strip()
         )
     return proc.stdout
 
 
+def _git_commit(work_dir: Path, message: str) -> None:
+    """Commit via ``-F`` so Windows never gets NUL/encoding issues in ``-m``."""
+    text = _clean_arg(message).strip() or "export_1c_help: sync help"
+    if not text.endswith("\n"):
+        text += "\n"
+    with tempfile.NamedTemporaryFile(
+        mode="w",
+        encoding="utf-8",
+        newline="\n",
+        suffix=".txt",
+        delete=False,
+    ) as fh:
+        fh.write(text)
+        msg_path = fh.name
+    try:
+        _run(["git", "commit", "-F", msg_path], cwd=work_dir)
+    finally:
+        try:
+            Path(msg_path).unlink()
+        except OSError:
+            pass
+
+
 def prepare_wiki_clone(
     wiki_url: str,
     work_dir: Path,
@@ -149,5 +186,5 @@ def push_wiki(
     if not status.strip():
         return
 
-    _run(["git", "commit", "-m", message], cwd=work_dir)
+    _git_commit(work_dir, message)
     _run(["git", "push", "origin", f"HEAD:{branch}"], cwd=work_dir)