When a dangerous command was blocked and the user approved it via /approve,
the command was executed but the agent loop had already exited — the agent
never received the command output and the task died silently.
Now _handle_approve_command sends immediate feedback to the user, then
creates a synthetic continuation message with the command output and feeds
it through _handle_message so the agent picks up where it left off.
- Send command result to chat immediately via adapter.send()
- Create synthetic MessageEvent with command + output as context
- Spawn asyncio task to re-invoke agent via _handle_message
- Return None (feedback already sent directly)
- Add test for agent re-invocation after approval
- Update existing approval tests for new return behavior
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