gofmt: bring internal/ and cmd/ back to gofmt -l clean

Mechanical `gofmt -w ./internal ./cmd`. Mostly struct-field realignment that
had drifted, plus a few trailing-newline fixes. No behaviour change — gofmt is
semantics-preserving, and build/vet/test are green either side.

Split out from the code-review fixes that follow so those stay reviewable
instead of hiding inside a wall of realignment.

internal/plugin/adventure_flavor_blacksmith.go

@@ -79,4 +79,3 @@ var blacksmithBrokenCondition = []string{
 	"_looks at the condition, looks at you, looks back at the condition_ You know it costs more when you let it get like this. Of course you know. You just didn't care. That's fine. I care enough for both of us. It'll cost you.",
 	"This could have been avoided with regular visits. _slides the cost estimate across the counter without breaking eye contact_",
 }
-