Batch Aider output into structured blocks instead of per-line events

Aider runner now buffers entire turn output and parses it into thinking,
text, shell command, and cost blocks. Adapter updated for new event types.
Fixes console UI showing individual chevrons per output line.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

v2/src/lib/adapters/aider-messages.ts

@@ -5,6 +5,8 @@ import type {
   AgentMessage,
   InitContent,
   TextContent,
+  ThinkingContent,
+  ToolCallContent,
   CostContent,
   ErrorContent,
 } from './claude-messages';
@@ -16,8 +18,10 @@ import { str, num } from '../utils/type-guards';
  *
  * The Aider runner emits events in this format:
  * - {type:'system', subtype:'init', model, session_id, cwd}
- * - {type:'assistant', message:{role:'assistant', content:'...'}}
- * - {type:'result', subtype:'result', result:'...', cost_usd, duration_ms, is_error}
+ * - {type:'assistant', message:{role:'assistant', content:'...'}} — batched text block
+ * - {type:'thinking', content:'...'} — thinking/reasoning block
+ * - {type:'tool_use', id, name, input} — shell command execution
+ * - {type:'result', subtype:'result', cost_usd, duration_ms, is_error}
  * - {type:'error', message:'...'}
  */
 export function adaptAiderMessage(raw: Record<string, unknown>): AgentMessage[] {
@@ -46,6 +50,14 @@ export function adaptAiderMessage(raw: Record<string, unknown>): AgentMessage[]
         timestamp,
       }];
 
+    case 'thinking':
+      return [{
+        id: uuid,
+        type: 'thinking',
+        content: { text: str(raw.content) } satisfies ThinkingContent,
+        timestamp,
+      }];
+
     case 'assistant': {
       const msg = typeof raw.message === 'object' && raw.message !== null
         ? raw.message as Record<string, unknown>
@@ -60,6 +72,18 @@ export function adaptAiderMessage(raw: Record<string, unknown>): AgentMessage[]
       }];
     }
 
+    case 'tool_use':
+      return [{
+        id: uuid,
+        type: 'tool_call',
+        content: {
+          toolUseId: str(raw.id),
+          name: str(raw.name, 'shell'),
+          input: raw.input,
+        } satisfies ToolCallContent,
+        timestamp,
+      }];
+
     case 'result':
       return [{
         id: uuid,