fix(agent-executor): restore wrench emoji in tool output format

The wrench emoji (🔧) was accidentally removed in commit 6ec9a257
during the service condensing refactor. This broke:

1. Log parser - uses startsWith('🔧') to detect tool calls, causing
   them to be categorized as "info" instead of "tool_call"
2. Agent context parser - uses '🔧 Tool: TodoWrite' marker to find
   tasks, causing task list to not appear on kanban cards

This fix restores the emoji to fix both issues.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/src/services/agent-executor.ts

@@ -255,7 +255,7 @@ export class AgentExecutor {
                 input: block.input,
               });
               if (responseText.length > 0 && !responseText.endsWith('\n')) responseText += '\n';
-              responseText += `\n Tool: ${block.name}\n`;
+              responseText += `\n🔧 Tool: ${block.name}\n`;
               if (block.input) responseText += `Input: ${JSON.stringify(block.input, null, 2)}\n`;
               scheduleWrite();
             }