feat(queue): support solution-based queues and update metadata handling

.claude/agents/issue-plan-agent.md

@@ -172,20 +172,47 @@ function decomposeTasks(issue, exploration) {
 - Task validation (all 5 phases present)
 - File isolation check (ensure minimal overlap across issues in batch)
 
-**Solution Registration** (via CLI endpoint):
+**Solution Registration** (via file write):
 
-**Step 1: Create solutions**
-```bash
-ccw issue solution <issue-id> --data '{"description":"...", "approach":"...", "tasks":[...]}'
-# Output: {"id":"SOL-{issue-id}-1", ...}
+**Step 1: Create solution files**
+
+Write solution JSON to JSONL file (one line per solution):
+
+```
+.workflow/issues/solutions/{issue-id}.jsonl
 ```
 
-**CLI Features:**
-| Feature | Description |
-|---------|-------------|
-| Auto-increment ID | `SOL-{issue-id}-{seq}` (e.g., `SOL-GH-123-1`) |
-| Multi-solution | Appends to existing JSONL, supports multiple per issue |
-| Trailing newline | Proper JSONL format, no corruption |
+**File Format** (JSONL - each line is a complete solution):
+```
+{"id":"SOL-GH-123-1","description":"...","approach":"...","analysis":{...},"score":0.85,"tasks":[...]}
+{"id":"SOL-GH-123-2","description":"...","approach":"...","analysis":{...},"score":0.75,"tasks":[...]}
+```
+
+**Solution Schema** (must match CLI `Solution` interface):
+```typescript
+{
+  id: string;                    // Format: SOL-{issue-id}-{N}
+  description?: string;
+  approach?: string;
+  tasks: SolutionTask[];
+  analysis?: { risk, impact, complexity };
+  score?: number;
+  // Note: is_bound, created_at are added by CLI on read
+}
+```
+
+**Write Operation**:
+```javascript
+// Append solution to JSONL file (one line per solution)
+const solutionId = `SOL-${issueId}-${seq}`;
+const solutionLine = JSON.stringify({ id: solutionId, ...solution });
+
+// Read existing, append new line, write back
+const filePath = `.workflow/issues/solutions/${issueId}.jsonl`;
+const existing = existsSync(filePath) ? readFileSync(filePath) : '';
+const newContent = existing.trimEnd() + (existing ? '\n' : '') + solutionLine + '\n';
+Write({ file_path: filePath, content: newContent })
+```
 
 **Step 2: Bind decision**
 - **Single solution** → Auto-bind: `ccw issue bind <issue-id> <solution-id>`
@@ -251,9 +278,9 @@ Each line is a solution JSON containing tasks. Schema: `cat .claude/workflows/cl
 4. Quantify acceptance.criteria with testable conditions
 5. Validate DAG before output
 6. Evaluate each solution with `analysis` and `score`
-7. Use CLI endpoint: `ccw issue solution <issue-id> --data '{...}'`
+7. Write solutions to `.workflow/issues/solutions/{issue-id}.jsonl` (append mode)
 8. For HIGH complexity: generate 2-3 candidate solutions
-9. **Solution ID format**: `SOL-{issue-id}-{seq}` (e.g., `SOL-GH-123-1`, `SOL-GH-123-2`)
+9. **Solution ID format**: `SOL-{issue-id}-{N}` (e.g., `SOL-GH-123-1`, `SOL-GH-123-2`)
 
 **CONFLICT AVOIDANCE** (for batch processing of similar issues):
 1. **File isolation**: Each issue's solution should target distinct files when possible
@@ -270,6 +297,6 @@ Each line is a solution JSON containing tasks. Schema: `cat .claude/workflows/cl
 5. **Bind when multiple solutions exist** - MUST check `solutions.length === 1` before calling `ccw issue bind`
 
 **OUTPUT**:
-1. Create solutions via CLI: `ccw issue solution <issue-id> --data '{...}'`
+1. Write solutions to `.workflow/issues/solutions/{issue-id}.jsonl` (JSONL format)
 2. Single solution → `ccw issue bind <issue-id> <solution-id>`; Multiple → return only
 3. Return JSON with `bound`, `pending_selection`

ccw/src/core/routes/issue-routes.ts

@@ -120,7 +120,18 @@ function readQueue(issuesDir: string) {
 
 function writeQueue(issuesDir: string, queue: any) {
   if (!existsSync(issuesDir)) mkdirSync(issuesDir, { recursive: true });
-  queue._metadata = { ...queue._metadata, updated_at: new Date().toISOString(), total_tasks: queue.tasks?.length || 0 };
+
+  // Support both solution-based and task-based queues
+  const items = queue.solutions || queue.tasks || [];
+  const isSolutionBased = Array.isArray(queue.solutions) && queue.solutions.length > 0;
+
+  queue._metadata = {
+    ...queue._metadata,
+    updated_at: new Date().toISOString(),
+    ...(isSolutionBased
+      ? { total_solutions: items.length }
+      : { total_tasks: items.length })
+  };
 
   // Check if using new multi-queue structure
   const queuesDir = join(issuesDir, 'queues');
@@ -136,8 +147,13 @@ function writeQueue(issuesDir: string, queue: any) {
       const index = JSON.parse(readFileSync(indexPath, 'utf8'));
       const queueEntry = index.queues?.find((q: any) => q.id === queue.id);
       if (queueEntry) {
-        queueEntry.total_tasks = queue.tasks?.length || 0;
-        queueEntry.completed_tasks = queue.tasks?.filter((i: any) => i.status === 'completed').length || 0;
+        if (isSolutionBased) {
+          queueEntry.total_solutions = items.length;
+          queueEntry.completed_solutions = items.filter((i: any) => i.status === 'completed').length;
+        } else {
+          queueEntry.total_tasks = items.length;
+          queueEntry.completed_tasks = items.filter((i: any) => i.status === 'completed').length;
+        }
         writeFileSync(indexPath, JSON.stringify(index, null, 2));
       }
     } catch {
@@ -184,9 +200,26 @@ function enrichIssues(issues: any[], issuesDir: string) {
   });
 }
 
+/**
+ * Get queue items (supports both solution-based and task-based queues)
+ */
+function getQueueItems(queue: any): any[] {
+  return queue.solutions || queue.tasks || [];
+}
+
+/**
+ * Check if queue is solution-based
+ */
+function isSolutionBasedQueue(queue: any): boolean {
+  return Array.isArray(queue.solutions) && queue.solutions.length > 0;
+}
+
 function groupQueueByExecutionGroup(queue: any) {
   const groups: { [key: string]: any[] } = {};
-  for (const item of queue.tasks || []) {
+  const items = getQueueItems(queue);
+  const isSolutionBased = isSolutionBasedQueue(queue);
+
+  for (const item of items) {
     const groupId = item.execution_group || 'ungrouped';
     if (!groups[groupId]) groups[groupId] = [];
     groups[groupId].push(item);
@@ -194,11 +227,13 @@ function groupQueueByExecutionGroup(queue: any) {
   for (const groupId of Object.keys(groups)) {
     groups[groupId].sort((a, b) => (a.execution_order || 0) - (b.execution_order || 0));
   }
-  const executionGroups = Object.entries(groups).map(([id, items]) => ({
+  const executionGroups = Object.entries(groups).map(([id, groupItems]) => ({
     id,
     type: id.startsWith('P') ? 'parallel' : id.startsWith('S') ? 'sequential' : 'unknown',
-    task_count: items.length,
-    tasks: items.map(i => i.item_id)
+    // Use appropriate count field based on queue type
+    ...(isSolutionBased
+      ? { solution_count: groupItems.length, solutions: groupItems.map(i => i.item_id) }
+      : { task_count: groupItems.length, tasks: groupItems.map(i => i.item_id) })
   })).sort((a, b) => {
     const aFirst = groups[a.id]?.[0]?.execution_order || 0;
     const bFirst = groups[b.id]?.[0]?.execution_order || 0;
@@ -323,7 +358,7 @@ export async function handleIssueRoutes(ctx: RouteContext): Promise<boolean> {
     return true;
   }
 
-  // POST /api/queue/reorder - Reorder queue items
+  // POST /api/queue/reorder - Reorder queue items (supports both solutions and tasks)
   if (pathname === '/api/queue/reorder' && req.method === 'POST') {
     handlePostRequest(req, res, async (body: any) => {
       const { groupId, newOrder } = body;
@@ -332,8 +367,11 @@ export async function handleIssueRoutes(ctx: RouteContext): Promise<boolean> {
       }
 
       const queue = readQueue(issuesDir);
-      const groupItems = queue.tasks.filter((item: any) => item.execution_group === groupId);
-      const otherItems = queue.tasks.filter((item: any) => item.execution_group !== groupId);
+      const items = getQueueItems(queue);
+      const isSolutionBased = isSolutionBasedQueue(queue);
+
+      const groupItems = items.filter((item: any) => item.execution_group === groupId);
+      const otherItems = items.filter((item: any) => item.execution_group !== groupId);
 
       if (groupItems.length === 0) return { error: `No items in group ${groupId}` };
 
@@ -347,7 +385,7 @@ export async function handleIssueRoutes(ctx: RouteContext): Promise<boolean> {
 
       const itemMap = new Map(groupItems.map((i: any) => [i.item_id, i]));
       const reorderedItems = newOrder.map((qid: string, idx: number) => ({ ...itemMap.get(qid), _idx: idx }));
-      const newQueue = [...otherItems, ...reorderedItems].sort((a, b) => {
+      const newQueueItems = [...otherItems, ...reorderedItems].sort((a, b) => {
         const aGroup = parseInt(a.execution_group?.match(/\d+/)?.[0] || '999');
         const bGroup = parseInt(b.execution_group?.match(/\d+/)?.[0] || '999');
         if (aGroup !== bGroup) return aGroup - bGroup;
@@ -357,8 +395,14 @@ export async function handleIssueRoutes(ctx: RouteContext): Promise<boolean> {
         return (a.execution_order || 0) - (b.execution_order || 0);
       });
 
-      newQueue.forEach((item, idx) => { item.execution_order = idx + 1; delete item._idx; });
-      queue.tasks = newQueue;
+      newQueueItems.forEach((item, idx) => { item.execution_order = idx + 1; delete item._idx; });
+
+      // Write back to appropriate array based on queue type
+      if (isSolutionBased) {
+        queue.solutions = newQueueItems;
+      } else {
+        queue.tasks = newQueueItems;
+      }
       writeQueue(issuesDir, queue);
 
       return { success: true, groupId, reordered: newOrder.length };