fix(plugins): sweep temp files a killed process left behind

Review finding, and the adjacent case to the one this PR already fixed.
_sweep_debris collects *.partial and *.corrupt; _write_identity and
_install_salt both create telemetry-*.<pid>.tmp and unlink it in a finally,
which a SIGKILL skips. Its own docstring reasoning, that no glob in the module
matches them so nothing else ever will, applies equally.

Collected on the stale window rather than the expiry window: unlike a quarantined
batch a temp file carries nothing worth keeping for diagnosis.

276 passed, 8 skipped.

Claude-Session: https://claude.ai/code/session_01C7tEmH86HAr7GoAAKCEHZb

integrations/codex-plugin/core/telemetry.py

@@ -486,6 +486,15 @@ def _sweep_debris(directory: Path) -> None:
                 quarantined.unlink()
         except OSError:
             continue
+    # The same reasoning covers *.tmp. _write_identity and _install_salt both
+    # create one and unlink it in a finally, which a SIGKILL skips, and no glob
+    # in this module matches the leftovers either.
+    for temporary in directory.glob("telemetry-*.tmp"):
+        try:
+            if now - temporary.stat().st_mtime > CLAIM_STALE_SECONDS:
+                temporary.unlink()
+        except OSError:
+            continue
 
 
 def _claim_parked(directory: Path) -> Path | None: