refactor(os): extract scitex.os into standalone scitex-os package

pyproject.toml

@@ -490,7 +490,8 @@ notification = [
 
 # OS Module - OS utilities
 # Use: pip install scitex[os]
-os = []
+# Real implementation lives in the standalone scitex-os package.
+os = ["scitex-os>=0.1.0"]
 
 # Parallel Module - Parallel processing
 # Use: pip install scitex[parallel]

src/scitex/os/__init__.py

@@ -1,12 +1,20 @@
-#!/usr/bin/env python3
-"""Scitex os module."""
-
-from ._check_host import check_host, is_host, verify_host
-from ._mv import mv
-
-__all__ = [
-    "check_host",
-    "is_host",
-    "mv",
-    "verify_host",
-]
+"""SciTeX os — thin compatibility shim for scitex-os.
+
+Aliases ``scitex.os`` to the standalone ``scitex_os`` package via ``sys.modules``.
+``scitex.os is scitex_os``.
+
+Install: ``pip install scitex[os]``  (or ``pip install scitex-os``).
+See: https://github.com/ywatanabe1989/scitex-os
+"""
+
+import sys as _sys
+
+try:
+    import scitex_os as _real
+except ImportError as _e:  # pragma: no cover
+    raise ImportError(
+        "scitex.os requires the 'scitex-os' package. "
+        "Install with: pip install scitex[os]  (or: pip install scitex-os)"
+    ) from _e
+
+_sys.modules[__name__] = _real