feat: unify queue execution handling with QueueItemExecutor and CLI execution settings

- Removed ad-hoc test scripts and temp files from project root
- Added QueueItemExecutor component to handle both session and orchestrator executions
- Created CliExecutionSettings component for shared execution parameter controls
- Introduced useCliSessionCore hook for managing CLI session lifecycle
- Merged buildQueueItemPrompt and buildQueueItemInstruction into a single function for context building
- Implemented Zustand store for queue execution state management
- Updated localization files for new execution features

ccw/frontend/src/lib/queue-prompt.ts

@@ -0,0 +1,76 @@
+// ========================================
+// Queue Prompt Builder
+// ========================================
+// Unified prompt/instruction builder for queue item execution.
+// Merges buildQueueItemPrompt (QueueExecuteInSession) and
+// buildQueueItemInstruction (QueueSendToOrchestrator) into a single function.
+
+import type { QueueItem } from '@/lib/api';
+
+/**
+ * Build a context string for executing a queue item.
+ *
+ * This produces the same output that both `buildQueueItemPrompt` and
+ * `buildQueueItemInstruction` used to produce. The only difference between
+ * the two originals was that the "in-session" variant included the matched
+ * task block from `solution.tasks[]`; this unified version always includes
+ * it when available, which is strictly a superset.
+ */
+export function buildQueueItemContext(
+  item: QueueItem,
+  issue: any | undefined
+): string {
+  const lines: string[] = [];
+
+  // Header
+  lines.push(`Queue Item: ${item.item_id}`);
+  lines.push(`Issue: ${item.issue_id}`);
+  lines.push(`Solution: ${item.solution_id}`);
+  if (item.task_id) lines.push(`Task: ${item.task_id}`);
+  lines.push('');
+
+  if (issue) {
+    if (issue.title) lines.push(`Title: ${issue.title}`);
+    if (issue.context) {
+      lines.push('');
+      lines.push('Context:');
+      lines.push(String(issue.context));
+    }
+
+    const solution = Array.isArray(issue.solutions)
+      ? issue.solutions.find((s: any) => s?.id === item.solution_id)
+      : undefined;
+
+    if (solution) {
+      lines.push('');
+      lines.push('Solution Description:');
+      if (solution.description) lines.push(String(solution.description));
+      if (solution.approach) {
+        lines.push('');
+        lines.push('Approach:');
+        lines.push(String(solution.approach));
+      }
+
+      // Include matched task from solution.tasks when available
+      const tasks = Array.isArray(solution.tasks) ? solution.tasks : [];
+      const task = item.task_id
+        ? tasks.find((t: any) => t?.id === item.task_id)
+        : undefined;
+      if (task) {
+        lines.push('');
+        lines.push('Task:');
+        if (task.title) lines.push(`- ${task.title}`);
+        if (task.description) lines.push(String(task.description));
+      }
+    }
+  }
+
+  // Footer instruction
+  lines.push('');
+  lines.push('Instruction:');
+  lines.push(
+    'Implement the above queue item in this repository. Prefer small, testable changes; run relevant tests; report blockers if any.'
+  );
+
+  return lines.join('\n');
+}