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`ensureSymlink` previously short-circuited whenever `dst` already existed
as a regular file ("Regular file exists — don't overwrite"). On Windows
that branch is reachable via the createFileLink copy fallback that fires
when `os.Symlink` is unavailable, so once a per-task `codex-home/auth.json`
was written as a copy it would never be refreshed by subsequent
Prepare/Reuse calls. If the shared `~/.codex/auth.json` rotated (e.g.
Codex Desktop refreshed the token in the background), the daemon kept
handing Codex a now-revoked refresh_token, which the OAuth server
rejected with `refresh_token_reused` / `token_expired`. Renaming the
workspace directory was the only recovery path.
Treat any non-matching dst — wrong-target symlink, broken symlink, or
stale regular file — as something to delete and re-create via
createFileLink, so each Prepare/Reuse mirrors the current shared source.
Add a `logCodexAuthState` info log (file kind, link target, size, mtime —
never contents) so operators chasing the same symptom can see at a glance
whether the per-task home is tracking the shared auth or has drifted.
Tests cover: stale regular-file dst is replaced, copy-fallback dst is
refreshed when the shared source rotates, and a high-level
prepareCodexHome regression simulating the Windows + token-rotation
scenario from issue #2081.
Co-authored-by: multica-agent <github@multica.ai>