Fix CI: goinstall mode for golangci-lint, fix plan.go vet warning

Author: Patel230

.github/workflows/ci.yml

@@ -68,6 +68,7 @@ jobs:
         uses: golangci/golangci-lint-action@v7
         with:
           version: v2.1.0
+          install-mode: goinstall
           args: --timeout 5m
 
       - name: govulncheck

cmd/plan.go

@@ -34,7 +34,7 @@ var planCreateCmd = &cobra.Command{
 
 		// Generate the plan prompt (would normally be sent to an LLM).
 		prompt := planner.Generate(description, "")
-		cmd.Println("Plan prompt generated. Send this to an LLM to produce a plan:\n")
+		cmd.Println("Plan prompt generated. Send this to an LLM to produce a plan:")
 		cmd.Println("--- System ---")
 		cmd.Println(prompt.System)
 		cmd.Println()