document-skills: soffice.py crashes on Windows (AF_UNIX AttributeError)

Bug

The office/soffice.py helper shipped with the docx, pptx, and xlsx document-skills crashes on Windows with:

AttributeError: module 'socket' has no attribute 'AF_UNIX'

Root cause

_needs_shim() unconditionally calls socket.socket(socket.AF_UNIX, ...) to test whether Unix domain sockets are available. On Windows, the AF_UNIX constant doesn't exist as a Python attribute, so it throws AttributeError instead of the expected OSError.

The shim itself (LD_PRELOAD + compiled C .so) is Linux-only and irrelevant on Windows, but the detection code runs before it can be skipped.

Affected files

All three copies are identical and have the same bug:

• skills/docx/scripts/office/soffice.py
• skills/pptx/scripts/office/soffice.py
• skills/xlsx/scripts/office/soffice.py

Additionally, skills/docx/scripts/accept_changes.py has two Windows-incompatible assumptions:

1. Hardcoded /tmp/ path for the LibreOffice profile directory — resolves to C:\tmp\ on Windows instead of the actual temp directory
2. file:// URI construction — produces file://C:\Users\... instead of the file:///C:/Users/... format LibreOffice expects on Windows

Suggested fix

soffice.py — Add an early return in _needs_shim():

def _needs_shim() -> bool:
    if os.name == "nt":
        return False
    try:
        s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        s.close()
        return False
    except OSError:
        return True

accept_changes.py — Use tempfile.gettempdir() for the profile path and build the file:// URI with platform-aware formatting:

LIBREOFFICE_PROFILE = str(Path(tempfile.gettempdir()) / "libreoffice_docx_profile")

def _profile_file_uri() -> str:
    p = Path(LIBREOFFICE_PROFILE).resolve()
    if os.name == "nt":
        return "file:///" + p.as_posix()
    return "file://" + str(p)

Environment

• Windows 11 (no WSL)
• Python 3.12
• LibreOffice 25.8
• Claude Code with document-skills plugin (cache hash 1ed29a03dc85)