fix: Resolve CI lint and build errors

- Add error suppression for enc.Encode() calls in info.go (errcheck lint)
- Add missing encoding/json import in install_integration_test.go

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/install_integration_test.go

@@ -3,6 +3,7 @@
 package cmd
 
 import (
+	"encoding/json"
 	"os"
 	"os/exec"
 	"path/filepath"