[GH] (texera/loop-feb): Workflow run "Benchmarks" is working again!

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The GitHub Actions job "Benchmarks" on texera.git/loop-feb has succeeded.
Run started by GitHub user aglinxinyuan (triggered by aglinxinyuan).

Head commit for run:
68d9ad31ca1215cb0ca256ba021d050413ebf0bd / Xinyuan Lin <xi...@uci.edu>
chore(amber): pre-merge hygiene pass over the loop changes

Comment/test hygiene from a final review sweep; no mechanism changes:

- Fix a doubled @pytest.mark.timeout(2) left by an earlier test deletion,
  and add the missing timeout mark on the write-error sibling test.
- Rename stale Controller vocabulary in the jump-test helpers
  (_stub_coordinator / _Coordinator) and three RegionExecutionCoordinator
  references in the descriptor specs to the post-rename Manager names.
- Replace vacuous never-leak assertions on names that were never envelope
  keys ("LoopStartId"/"LoopStartStateURI") with the real key
  ("loop_start_id").
- run_update: use namespace.get() for the reserved-table check so a user
  `update` that deletes `table` raises the friendly reserved-name error
  instead of a bare KeyError; new test pins it. Collision tests now pin
  which variable was flagged.
- Refresh stale prose: Context.report_exception covers write failures too;
  descriptor-spec comments no longer claim `output` is reserved or mention
  unpickling; test_loop_operators docstrings match the raise-on-collision
  behavior and list the newer test classes.
- Mode-override warn now carries the file's WID/EID log prefix and lists
  operators deterministically (sorted).

Report URL: https://github.com/apache/texera/actions/runs/29188157648

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