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A clogged fuel filter would show up as starvation under hard acceleration, not an idle or starting problem.
A partly clogged injector could cause a poor spray pattern and would appear is slightly high HC. It would only occur if it was severe enough for a lean misfire.
If the guy that replaced the cat was truthful, and the old one was empty... somebody had to manually knock out the ceramic. It didn't happen by itself. Only a few minutes burn-in time is needed to clear the new exhaust parts of assembly chemicals. You don't need to drive it far.
Emission limits vary by vehicle weight and jurisdiction. The results are only slightly helpful without knowing the limits for each test. Post the limits with the test results if the car fails again.
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