fix(lint): check filepath.Walk/Body.Close/writeFrame errors, remove dead func (errcheck/unused)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Patel230

cmd/chat_print.go

@@ -453,7 +453,7 @@ func runWatchPolling(root string) error {
 
 func getLastModTime(root string) time.Time {
 	var latest time.Time
-	filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+	_ = filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return nil
 		}

cmd/exec.go

@@ -409,12 +409,6 @@ type GHAContext struct {
 	Mention   bool    // whether an @hawk mention was found in a comment
 }
 
-// inGitHubActions reports whether the process is running inside a GitHub
-// Actions runner.
-func inGitHubActions() bool {
-	return os.Getenv("GITHUB_ACTIONS") == "true"
-}
-
 // detectGitHubActions inspects the GitHub Actions environment and the event
 // payload at GITHUB_EVENT_PATH to decide between interactive and automation
 // mode. It returns a context whose Active field is false when not running under

internal/mcp/ws.go

@@ -185,7 +185,7 @@ func wsDial(ctx context.Context, rawURL string, headers map[string]string) (net.
 		_ = conn.Close()
 		return nil, nil, err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	if resp.StatusCode != http.StatusSwitchingProtocols {
 		_ = conn.Close()
@@ -234,7 +234,7 @@ func (s *WSServer) readLoop() {
 		case wsOpClose:
 			return
 		case wsOpPing:
-			s.writeFrame(wsOpPong, payload)
+			_ = s.writeFrame(wsOpPong, payload)
 			continue
 		case wsOpPong:
 			continue