lib.ProjectConf: Clean up temp files

The _load() helper in test/unit/python/jw/pkg/lib/ProjectConf/test.py uses tempfile.NamedTemporaryFile(..., delete=False) but never removes the created files. Each test call leaked a .conf file in /tmp.
Track all created paths in a _tmpfiles list and call _cleanup() at the end of the test to unlink them.
Assisted-by: unsloth/Qwen3.6-35B-A3B-GGUF:IQ4_NL with pi.dev v0.80.2
Signed-off-by: Jan Lindemann <jan@janware.com>

test/unit/python/jw/pkg/lib/ProjectConf/test.py

@@ -1,14 +1,25 @@
+import os
 import tempfile
 from jw.pkg.lib.ProjectConf import ProjectConf
 
 # -- Helper: create temp file and read it --
 
+_tmpfiles: list[str] = []
+
 def _load(text: str) -> ProjectConf:
     with tempfile.NamedTemporaryFile(mode='w', suffix='.conf', delete=False) as f:
         f.write(text)
         f.flush()
+        _tmpfiles.append(f.name)
         return ProjectConf.read(f.name)
 
+
+def _cleanup():
+    for _p in _tmpfiles:
+        os.unlink(_p)
+        del _p
+    _tmpfiles.clear()
+
 # -- Basic construction --
 
 pc = _load('[section]\nkey = value\n')
@@ -250,4 +261,5 @@ assert pc.get_str('section', 'not_a_key') == '[bracket]'
 pc = _load('[section]\nlist = "a", "b", "c"\n')
 assert pc.get_list('section', 'list') == ['a', 'b', 'c']
 
+_cleanup()
 print('All ProjectConf tests passed')