[fray] Remove 24h default timeout on job wait (#4380)

## Summary
- Replace the hard-coded 24h (`86400.0`) default timeout in
`IrisJobHandle.wait()` with `float("inf")`, so callers that pass
`timeout=None` wait indefinitely instead of silently timing out after a
day.

## Test plan
- [x] Verified the change applies cleanly
- [ ] Run fray jobs that exceed 24h and confirm they no longer time out
unexpectedly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Rafal Wojdyla <ravwojdyla@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Rafal Wojdyla <ravwojdyla@users.noreply.github.com>

Author: 4 people

lib/fray/src/fray/v2/iris_backend.py

@@ -190,7 +190,9 @@ def status(self) -> JobStatus:
     def wait(
         self, timeout: float | None = None, *, raise_on_failure: bool = True, stream_logs: bool = False
     ) -> JobStatus:
-        effective_timeout = timeout if timeout is not None else 86400.0
+        # Iris client requires a numeric timeout. When None (wait indefinitely),
+        # use ~5 years so the caller is never surprised by a silent timeout.
+        effective_timeout = timeout if timeout is not None else 86400.0 * 365 * 5
         try:
             self._job.wait(timeout=effective_timeout, raise_on_failure=raise_on_failure, stream_logs=stream_logs)
         except Exception:

lib/zephyr/src/zephyr/execution.py

@@ -1564,7 +1564,7 @@ def execute(
                 backoff.reset()
                 logger.info("Coordinator job submitted: %s (job_id=%s)", job_name, self._coordinator_job.job_id)
 
-                self._coordinator_job.wait(raise_on_failure=True)
+                self._coordinator_job.wait(timeout=None, raise_on_failure=True)
 
                 # Read results written by the coordinator job.
                 # This must succeed — the job completed successfully.