- Add insertChildBefore() to Box component for positional insertion
- In chat controller, insert tool_execution components before the last
assistant message component (instead of appending after) when tools
were executed externally
- Simplify agent-loop externalToolExecution path back to basic
tool_execution_start/end emission
- Toolcall streaming events are filtered in the Claude Code adapter
to prevent duplicate rendering via message_update
Result: externally-executed tool calls render above the text response,
matching the expected visual flow.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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