* fix(sandbox): fall back to config.configurable for thread_id in lazy sandbox init
LangGraph Server injects thread_id via config["configurable"]["thread_id"],
not always via context["thread_id"]. Without the fallback, lazy sandbox
acquisition fails when context is empty.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* fix(sandbox): align configurable fallback style with task_tool.py
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* fix(sandbox): guard runtime.config None check for thread_id fallback
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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