[qodelicious]

iter_interpreters() with no key builds an empty PythonSpec(""), so in path_exe_finder the literal-name check does path / "", which is just the PATH directory. It exists, so every PATH entry gets handed to PathPythonInfo.from_exe as if it were an interpreter. Each one fails with Permission denied and is retried once, so on a normal PATH that's two wasted subprocesses per directory, plus noise in the debug log like

failed to query /usr/bin with code 13 err: 'Permission denied'

The check now uses is_file() instead of exists(), so only an actual file with that name is probed. It still follows symlinks like before.

Added a test with a PATH holding one python3.99 and no key. It asserts only that file gets probed. It fails on main (the directory shows up first) and passes with the fix.