claw was running containers with no volume mounts, so the agent
always saw an empty /workspace/group. Add build_mounts() to
replicate the same bind-mounts that container-runner.ts sets up
(group folder, .claude sessions, IPC dir, agent-runner source,
and project root for main).
Also includes upstream fix from qwibitai/nanoclaw#1368:
graceful terminate() before kill() on output sentinel, and early
return after a successful structured response so exit code stays 0.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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