When a run is cancelled or the sandbox dies mid-tool-call, LangGraph persists
the AIMessage tool_call but never the matching ToolMessage. The next run sends
the provider an orphaned tool_use (Anthropic 400: "tool_use ids were found
without tool_result blocks"), permanently wedging the thread on every retry.
Add RepairOrphanedToolCallsMiddleware, which inserts a synthetic error
ToolMessage immediately after any tool_call lacking a result so the agent can
retry instead of dying. Wired into the agent and reviewer graphs.
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
