fix(lint): exclude common fire-and-forget patterns from errcheck

.golangci.yml

@@ -29,7 +29,21 @@ linters:
         - G104  # Allow unhandled errors in fire-and-forget (notifications)
     errcheck:
       exclude-functions:
-        - (*os/exec.Cmd).Start  # Fire-and-forget for notifications
+        - (*os/exec.Cmd).Start      # Fire-and-forget for notifications
+        - (*os.File).Close           # Deferred close — error irrelevant after read
+        - (io.Closer).Close          # Same pattern for interfaces
+        - (*compress/gzip.Reader).Close
+        - (*archive/tar.Reader).Close
+        - (net.Conn).Close           # Best-effort cleanup
+        - os.Remove                  # Best-effort cleanup of temp files
+        - os.RemoveAll
+        - os.Unsetenv                # Test-only, always succeeds
+        - fmt.Fprintf                # Terminal output — error never actionable
+        - fmt.Printf
+        - fmt.Println
+        - (*github.com/fatih/color.Color).Fprintf
+        - (*github.com/fatih/color.Color).Printf
+        - (*github.com/fatih/color.Color).Println
     exhaustive:
       default-signifies-exhaustive: true
     misspell:

internal/agent/transport_ws.go

@@ -69,7 +69,7 @@ func (t *WSTransport) Connect(ctx context.Context) error {
 
 	conn, wsResp, err := dialer.DialContext(ctx, wsURLWithKey, header)
 	if wsResp != nil && wsResp.Body != nil {
-		defer wsResp.Body.Close() //nolint:errcheck
+		defer wsResp.Body.Close()
 	}
 	if err != nil {
 		return fmt.Errorf("ws dial: %w", err)

internal/arr/discover_e2e_test.go

@@ -21,7 +21,7 @@ func TestDiscoverE2E(t *testing.T) {
 		if err != nil {
 			t.Skipf("Port %s not reachable, skipping", port)
 		}
-		_ = conn.Close()
+		conn.Close()
 	}
 
 	t.Run("Discover", func(t *testing.T) {

internal/config/config.go

@@ -171,7 +171,7 @@ func Save(cfg Config, path string) error {
 	}
 
 	if err := os.Rename(tmpPath, path); err != nil {
-		_ = os.Remove(tmpPath)
+		os.Remove(tmpPath)
 		return fmt.Errorf("rename config: %w", err)
 	}
 

internal/config/config_test.go

@@ -93,7 +93,7 @@ func TestLoadPreservesDefaults(t *testing.T) {
 	path := filepath.Join(tmp, "config.toml")
 
 	// Write partial config (only auth section)
-	_ = os.WriteFile(path, []byte(`[auth]
+	os.WriteFile(path, []byte(`[auth]
 api_key = "tc_partial"
 `), 0o644)
 
@@ -193,7 +193,7 @@ func TestParseSpeed(t *testing.T) {
 func TestLoadInvalidTOML(t *testing.T) {
 	tmp := t.TempDir()
 	path := filepath.Join(tmp, "config.toml")
-	_ = os.WriteFile(path, []byte(`not valid toml [[[`), 0o644)
+	os.WriteFile(path, []byte(`not valid toml [[[`), 0o644)
 
 	_, err := Load(path)
 	if err == nil {

internal/config/paths_test.go

@@ -43,7 +43,7 @@ func TestDirOverrideEnv(t *testing.T) {
 
 func TestDirXDGOverride(t *testing.T) {
 	// Clear the custom env so XDG takes effect
-	_ = os.Unsetenv("UNARR_CONFIG_DIR")
+	os.Unsetenv("UNARR_CONFIG_DIR")
 	t.Setenv("XDG_CONFIG_HOME", "/xdg/config")
 
 	dir := Dir()

internal/library/mediainfo/ffprobe_download.go

@@ -97,8 +97,7 @@ func DownloadFFprobe() (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("download failed: %w", err)
 	}
-	defer resp.Body.Close() //nolint:errcheck // best-effort close
+	defer resp.Body.Close()
-
 	if resp.StatusCode != http.StatusOK {
 		return "", fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
@@ -167,7 +166,7 @@ func extractFromZip(data []byte, target string) ([]byte, error) {
 			if err != nil {
 				return nil, fmt.Errorf("cannot extract %s from archive: %w", target, err)
 			}
-			defer rc.Close() //nolint:errcheck // best-effort close
+			defer rc.Close()
 			return io.ReadAll(rc)
 		}
 	}

internal/mediaserver/detect.go

@@ -113,7 +113,7 @@ func plexLibraryPaths() []string {
 	if err != nil {
 		return nil
 	}
-	defer resp.Body.Close() //nolint:errcheck // best-effort close
+	defer resp.Body.Close()
 
 	if resp.StatusCode != 200 {
 		return nil
@@ -200,7 +200,7 @@ func jellyfinLibraryPaths(baseURL string) []string {
 	if err != nil {
 		return nil
 	}
-	defer resp.Body.Close() //nolint:errcheck // best-effort close
+	defer resp.Body.Close()
 
 	if resp.StatusCode != 200 {
 		return nil