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/dnd_zone_run.go

@@ -73,9 +73,9 @@ type DungeonRun struct {
 	// path of node_ids the player has resolved. NodeChoices stores
 	// pending fork-prompt state (G5 surface) — populated when the player
 	// arrives at a fork with 2+ unlocked outgoing edges.
-	CurrentNode   string
-	VisitedNodes  []string
-	NodeChoices   map[string]any
+	CurrentNode  string
+	VisitedNodes []string
+	NodeChoices  map[string]any
 
 	// Revisit R1 — monotonic count of node entries, including the entry
 	// room. Distinct from CurrentRoom: CurrentRoom answers "where am I on
@@ -623,4 +623,3 @@ func addLoot(runID string, itemID string) error {
 		 WHERE run_id = ?`, string(lootJSON), runID)
 	return err
 }
-