feat(queue): implement queue scheduler service and API routes

- Added QueueSchedulerService to manage task queue lifecycle, including state machine, dependency resolution, and session management.
- Implemented HTTP API endpoints for queue scheduling:
  - POST /api/queue/execute: Submit items to the scheduler.
  - GET /api/queue/scheduler/state: Retrieve full scheduler state.
  - POST /api/queue/scheduler/start: Start scheduling loop with items.
  - POST /api/queue/scheduler/pause: Pause scheduling.
  - POST /api/queue/scheduler/stop: Graceful stop of the scheduler.
  - POST /api/queue/scheduler/config: Update scheduler configuration.
- Introduced types for queue items, scheduler state, and WebSocket messages to ensure type safety and compatibility with the backend.
- Added static model lists for LiteLLM as a fallback for available models.

ccw/src/tools/cli-executor-core.ts

@@ -390,9 +390,13 @@ export function generateTransactionId(conversationId: string): TransactionId {
  * Inject transaction ID into user prompt
  * @param prompt - Original user prompt
  * @param txId - Transaction ID to inject
- * @returns Prompt with transaction ID injected at the start
+ * @returns Prompt with transaction ID injected at the start, or empty string if prompt is empty
  */
 export function injectTransactionId(prompt: string, txId: TransactionId): string {
+  // Don't inject TX ID for empty prompts (e.g., review mode with target flags)
+  if (!prompt || !prompt.trim()) {
+    return '';
+  }
   return `[CCW-TX-ID: ${txId}]\n\n${prompt}`;
 }
 
@@ -844,8 +848,15 @@ async function executeCliTool(
 
   // Inject transaction ID at the start of the final prompt for session tracking
   // This enables exact session matching during parallel execution scenarios
-  finalPrompt = injectTransactionId(finalPrompt, transactionId);
-  debugLog('TX_ID', `Injected transaction ID into prompt`, { transactionId, promptLength: finalPrompt.length });
+  // Skip injection for review mode with target flags (uncommitted/base/commit) as these
+  // modes don't accept prompt arguments in codex CLI
+  const isReviewWithTarget = mode === 'review' && (uncommitted || base || commit);
+  if (!isReviewWithTarget) {
+    finalPrompt = injectTransactionId(finalPrompt, transactionId);
+    debugLog('TX_ID', `Injected transaction ID into prompt`, { transactionId, promptLength: finalPrompt.length });
+  } else {
+    debugLog('TX_ID', `Skipped transaction ID injection for review mode with target flag`);
+  }
 
   // Check tool availability
   const toolStatus = await checkToolAvailability(tool);

ccw/src/tools/cli-history-store.ts

@@ -502,9 +502,11 @@ export class CliHistoryStore {
    * Save or update a conversation
    */
   saveConversation(conversation: ConversationRecord): void {
-    const promptPreview = conversation.turns.length > 0
-      ? conversation.turns[conversation.turns.length - 1].prompt.substring(0, 100)
-      : '';
+    // Ensure prompt is a string before calling substring
+    const lastTurn = conversation.turns.length > 0 ? conversation.turns[conversation.turns.length - 1] : null;
+    const rawPrompt = lastTurn?.prompt ?? '';
+    const promptStr = typeof rawPrompt === 'string' ? rawPrompt : JSON.stringify(rawPrompt);
+    const promptPreview = promptStr.substring(0, 100);
 
     const upsertConversation = this.db.prepare(`
       INSERT INTO conversations (id, created_at, updated_at, tool, model, mode, category, total_duration_ms, turn_count, latest_status, prompt_preview, parent_execution_id, project_root, relative_path)
@@ -609,7 +611,8 @@ export class CliHistoryStore {
       turns: turns.map(t => ({
         turn: t.turn_number,
         timestamp: t.timestamp,
-        prompt: t.prompt,
+        // Ensure prompt is always a string (handle legacy object data)
+        prompt: typeof t.prompt === 'string' ? t.prompt : JSON.stringify(t.prompt),
         duration_ms: t.duration_ms,
         status: t.status,
         exit_code: t.exit_code,
@@ -840,7 +843,10 @@ export class CliHistoryStore {
         category: r.category || 'user',
         duration_ms: r.total_duration_ms,
         turn_count: r.turn_count,
-        prompt_preview: r.prompt_preview || ''
+        // Ensure prompt_preview is always a string (handle legacy object data)
+        prompt_preview: typeof r.prompt_preview === 'string'
+          ? r.prompt_preview
+          : (r.prompt_preview ? JSON.stringify(r.prompt_preview) : '')
       }))
     };
   }

ccw/src/tools/native-session-discovery.ts

@@ -1197,3 +1197,30 @@ export function getToolSessionPath(tool: string): string | null {
   const discoverer = discoverers[tool];
   return discoverer?.basePath || null;
 }
+
+/**
+ * List all native sessions from all supported CLI tools
+ * Aggregates sessions from Gemini, Qwen, Codex, Claude, and OpenCode
+ * @param options - Optional filtering (workingDir, limit, afterTimestamp)
+ * @returns Combined sessions sorted by updatedAt descending
+ */
+export function listAllNativeSessions(options?: SessionDiscoveryOptions): NativeSession[] {
+  const allSessions: NativeSession[] = [];
+
+  // Collect sessions from all discoverers
+  for (const tool of Object.keys(discoverers)) {
+    const discoverer = discoverers[tool];
+    const sessions = discoverer.getSessions(options);
+    allSessions.push(...sessions);
+  }
+
+  // Sort by updatedAt descending
+  allSessions.sort((a, b) => b.updatedAt.getTime() - a.updatedAt.getTime());
+
+  // Apply limit if provided
+  if (options?.limit) {
+    return allSessions.slice(0, options.limit);
+  }
+
+  return allSessions;
+}

ccw/src/tools/session-content-parser.ts

@@ -236,13 +236,18 @@ function parseGeminiQwenSession(content: string, tool: string): ParsedSession {
   let model: string | undefined;
 
   for (const msg of session.messages) {
+    // Ensure content is always a string (handle legacy object data like {text: "..."})
+    const contentStr = typeof msg.content === 'string'
+      ? msg.content
+      : JSON.stringify(msg.content);
+
     if (msg.type === 'user') {
       turnNumber++;
       turns.push({
         turnNumber,
         timestamp: msg.timestamp,
         role: 'user',
-        content: msg.content
+        content: contentStr
       });
     } else if (msg.type === 'gemini' || msg.type === 'qwen') {
       // Find the corresponding user turn
@@ -255,7 +260,7 @@ function parseGeminiQwenSession(content: string, tool: string): ParsedSession {
         turnNumber,
         timestamp: msg.timestamp,
         role: 'assistant',
-        content: msg.content,
+        content: contentStr,
         thoughts: thoughts.length > 0 ? thoughts : undefined,
         tokens: msg.tokens ? {
           input: msg.tokens.input,
@@ -428,7 +433,11 @@ function parseCodexSession(content: string): ParsedSession {
           currentTurn++;
           const textContent = item.payload.content
             ?.filter(c => c.type === 'input_text')
-            .map(c => c.text)
+            .map(c => {
+              // Ensure text is a string (handle legacy object data like {text: "..."})
+              const txt = c.text;
+              return typeof txt === 'string' ? txt : JSON.stringify(txt);
+            })
             .join('\n') || '';
 
           turns.push({
@@ -461,7 +470,11 @@ function parseCodexSession(content: string): ParsedSession {
           // Assistant message (final response)
           const textContent = item.payload.content
             ?.filter(c => c.type === 'output_text' || c.type === 'text')
-            .map(c => c.text)
+            .map(c => {
+              // Ensure text is a string (handle legacy object data like {text: "..."})
+              const txt = c.text;
+              return typeof txt === 'string' ? txt : JSON.stringify(txt);
+            })
             .join('\n') || '';
 
           if (textContent) {