[yunyv]

Change Summary

Keep memory tools inside the orchestrator's existing store-ownership lifecycle. MemoryTool delegates to handle_tool_call, but that path previously bypassed the store lock and terminal-close check. A late tool could restart a closed backend and change MEMORY.md, or overlap another store operation and teardown.

• Serialize tool dispatch on the existing per-store lock and reject calls on a retired orchestrator, including callers that waited for the lock.
• Check backend startup state under the shutdown lock, so teardown also waits for a tool whose asynchronous backend start is still pending.
• Preserve live tool arguments/results and exception propagation. Include the configured formatter's adjustments in the touched file.

Related issue number

No existing issue is being closed. This completes the memory-tool path under the terminal-close/store-serialization contract introduced in #943; it does not change #1026's facts cache handling.

Validation

• Real SDK regression through MemoryTool, MemoryOrchestrator, and the file backend: baseline 7 failures / 2 passes; final 9 passes.
• python -m pytest tests/memory -q: final 188 passed, 74 skipped, 3 failed. With the identical tests on untouched source: 181 passed, 74 skipped, 10 failed. The three common failures require an unavailable ModelScope remote fixture or API-key configuration; no live provider testing is claimed.
• Independent lifecycle/control checks: 18 passed including the nine regressions.
• Changed-file configured pre-commit hooks, dependency compatibility, compilation, and diff checks pass. Full pre-commit was attempted on baseline and final and retains existing repository lint/style failures; it is not fully green.
• Full application and hosted CI tests were not run.

Checklist

• The pull request title is a good summary of the changes
• Unit tests for the changes exist
• Run pre-commit install and pre-commit run --all-files before git commit, and passed lint check.
• Documentation reflects the changes where applicable (no public configuration change)