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When I run A/C and the compressor kicks in at idle the RPMs will dip a little and it does make the feeling of engine lugging. I believe it's completely normal, it's just spinning up the compressor from a dead stop at idle RPMs where there's little available torque. If you want to see if that's what's causing your exact noise, warm up the car fully (so the RPMs will idle normally since they idle higher when cold), park, and hit the A/C switch and turn the temp all the way down to force the compressor on. See if that replicates your sound.
And yes, when you decelerate it's deceleration fuel cut that triggers. If you ever have an OBD2 app running while driving you'll notice AFRs shoot to the top of the scale since there's no fuel being injected and the momentum of the car keeps the engine spinning.
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