core/tools+test: make process and path checks Windows-portable

Use sys.executable for process tests; normalize denylist/glob paths; skip readline when missing.

tests/test_cli/test_readline_setup.py

@@ -1,5 +1,8 @@
 from __future__ import annotations
 
+import importlib.util
+
+import pytest
 import tomlkit
 
 from plyngent.cli.readline_setup import (
@@ -12,6 +15,11 @@ from plyngent.cli.state import ReplState
 from plyngent.config.models import ModelConfig, OpenAICompatibleProvider, OpenAIProvider
 from plyngent.config.store import ConfigStore
 
+pytestmark = pytest.mark.skipif(
+    importlib.util.find_spec("readline") is None,
+    reason="readline not available (e.g. Windows/Wine)",
+)
+
 
 def _minimal_state(tmp_path: object) -> ReplState:
     from pathlib import Path