I got it, I got it! And it was SO DUMB the whole time, of course it would be:
The trunk light being on fuse 3 instead of fuse 9 was the key to the whole problem. Obviously, since that is true, a modification must have been made to the wiring at some point, since that no longer adheres to the diagram. This would immediately explain why there are TWO wires going to the trunk - one is the original wire, now out of service for some reason, and one is the replacement wire, connected to the taillight circuit.
Since this fuse issue occurred almost at the same time I figured out the trunk light the first time, it dawned on me that something must have happened to the old trunk wire that was now shorting the circuit. I investigate - and lo and behold, the old trunk wire had snapped under the trunk lid hinge, so that when I closed the trunk, the live end of the wire touched the hinge, shorting the circuit.
So I clipped the end of the wire flush and taped it, labeling it appropriately (so that I can rewire the trunk light correctly in the future), and inserted the last remaining fuse in the 4-pack I purchased - and everything worked!
And yes, Jack, I've added 'rewire trunk light' to the list of Things to Do. I highly disapprove of such high-handed and inefficient doings, especially when you lose functionality over it (the trunk light SHOULD always come on when the trunk is open, not just when the parking lights are on).
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