Promote raw stream replay into standalone simulator tool and add SSE field doc

internal/js/chat-stream/sse_parse.js

@@ -193,6 +193,9 @@ function extractContentRecursive(items, defaultType) {
 }
 
 function shouldSkipPath(pathValue) {
+  if (isFragmentStatusPath(pathValue)) {
+    return true;
+  }
   if (SKIP_EXACT_PATHS.has(pathValue)) {
     return true;
   }
@@ -204,6 +207,13 @@ function shouldSkipPath(pathValue) {
   return false;
 }
 
+function isFragmentStatusPath(pathValue) {
+  if (!pathValue || pathValue === 'response/status') {
+    return false;
+  }
+  return /^response\/fragments\/-?\d+\/status$/i.test(pathValue);
+}
+
 function isCitation(text) {
   return asString(text).trim().startsWith('[citation:');
 }
@@ -225,5 +235,6 @@ module.exports = {
   parseChunkForContent,
   extractContentRecursive,
   shouldSkipPath,
+  isFragmentStatusPath,
   isCitation,
 };

internal/sse/parser.go

@@ -31,6 +31,9 @@ func ParseDeepSeekSSELine(raw []byte) (map[string]any, bool, bool) {
 }
 
 func shouldSkipPath(path string) bool {
+	if isFragmentStatusPath(path) {
+		return true
+	}
 	if _, ok := deepseek.SkipExactPathSet[path]; ok {
 		return true
 	}
@@ -42,6 +45,31 @@ func shouldSkipPath(path string) bool {
 	return false
 }
 
+func isFragmentStatusPath(path string) bool {
+	if path == "" || path == "response/status" {
+		return false
+	}
+	if !strings.HasPrefix(path, "response/fragments/") || !strings.HasSuffix(path, "/status") {
+		return false
+	}
+	mid := strings.TrimSuffix(strings.TrimPrefix(path, "response/fragments/"), "/status")
+	if mid == "" {
+		return false
+	}
+	if strings.HasPrefix(mid, "-") {
+		mid = mid[1:]
+	}
+	if mid == "" {
+		return false
+	}
+	for _, r := range mid {
+		if r < '0' || r > '9' {
+			return false
+		}
+	}
+	return true
+}
+
 func ParseSSEChunkForContent(chunk map[string]any, thinkingEnabled bool, currentFragmentType string) ([]ContentPart, bool, string) {
 	v, ok := chunk["v"]
 	if !ok {

internal/sse/parser_edge_test.go

@@ -90,6 +90,15 @@ func TestShouldSkipPathFragmentStatus(t *testing.T) {
 	if !shouldSkipPath("response/fragments/-3/status") {
 		t.Fatal("expected skip for fragment -3 status")
 	}
+	if !shouldSkipPath("response/fragments/-16/status") {
+		t.Fatal("expected skip for fragment -16 status")
+	}
+	if !shouldSkipPath("response/fragments/7/status") {
+		t.Fatal("expected skip for fragment 7 status")
+	}
+	if shouldSkipPath("response/status") {
+		t.Fatal("expected response/status to be handled by finish logic, not skipped")
+	}
 }
 
 func TestShouldSkipPathRegularContent(t *testing.T) {