Summary

After Path.rename, the renamed file reports exists() == True, but unlink() on the new name raises KeyError with the old name. OSAccess seems to keep a stale entry under the old key.

Minimal reproduction

import pydantic_monty as m

code = """
from pathlib import Path
Path('/r').write_text('x')
Path('/r').rename('/r2')
print(Path('/r2').exists())
Path('/r2').unlink()
"""

with m.Monty() as pool, pool.checkout() as s:
    s.feed_run(code, print_callback=m.CollectStreams(), os=m.OSAccess())

This prints True, then raises MontyRuntimeError: KeyError: r.

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