executeSingleTool had three exit paths but only the success path
emitted all end signals. The interrupted path (nested agent
approval) skipped OnToolEnd and StreamEventToolEnd entirely,
leaving hook consumers with an unpaired OnToolStart. The error
path also missed StreamEventToolEnd and AgentHooks.OnToolEnd.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
When the LLM returns tool calls after a handoff in the same
assistant message, they were silently dropped. This left
orphaned tool_call entries without matching tool-result
messages, causing protocol errors on the next LLM turn.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
