Trunk lid won't open

It seems too much of a coincidence that the trunk release stopped functioning just after the engine work, but it's not impossible.

There are no fuses dedicated to the trunk release circuit. The 3 fuses in the circuit all protect other functions as well. If a fuse is blown, I would expect you to have other malfunctions. Might be worthwhile to check every function you can think of.

The 3 fuses are:
ECU-B (10Amp)
ECU IG #1 (7.5Amp)
ECU-ACC (7.5A)

Assuming every other accessory seems to work OK, the first thing I would check is if 12V is reaching the release motor, which is part of the lock assembly in the trunklid. The trunklid liner can be removed with a door panel removal tool; it is held in place with the same kind of blind clips. You will find a connector plugged into the trunk release assembly. Wire colors are Black (motor), Black-white (ground), and White (trunk unlocked indicator). Each time a helper pushes the switch located next to the fuel door release switch, there should be a DC voltage between the Black and Black-white wire connector pins for a few seconds. You can also measure between the Black and a chassis ground point.

If no DC voltage, the problem is in the body computer, or body computer wiring, since none of your electrical trunk opening methods work, including the key fob.

I checked the factory manual step-by-step instructions for engine removal, trying to see if anything gets disturbed that could affect the trunk release circuit. The only commonality I found is the main engine firewall connector located behind the glove box. Body computer ground connectors are also located in this area and could have been disturbed.