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/mcpclient/client.go

@@ -16,9 +16,9 @@ import (
 
 // Client calls an MCP server over Streamable HTTP / JSON-RPC.
 type Client struct {
-	url    string
-	token  string
-	http   *http.Client
+	url   string
+	token string
+	http  *http.Client
 }
 
 // ErrTokenRequired is returned by New when token is empty. Empty token