style: apply gofmt

Estate-wide consolidation pass. golangci-lint v2 default set enables NO
formatter, so gofmt drift accumulated silently across the estate -- 8 repos
were carrying it, this one included. Same hole that let two files rot in
dma-cli until they were found by hand (dma-cli#12).

Mechanical and deterministic: `gofmt -w`, nothing hand-edited. Verified
before commit -- gofmt -l now reports 0, go build and go vet both pass.

Clears this repo to adopt the canonical .golangci.yml (infra
ci-templates/golangci.yml, infra#309 pattern) in a later wave.

internal/mcp/server.go

@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	ProtocolVersion    = "2025-03-26"
+	ProtocolVersion     = "2025-03-26"
 	maxRequestBodyBytes = 1 << 20 // 1 MiB
 )