Fix tool renderer override leaking between sessions

[matdev83]

Summary

• ensure the tool text renderer override uses context-local storage so concurrent sessions cannot clobber each other
• add a regression test that exercises overlapping override usage to prove isolation

Testing

• python -m pytest tests/unit/core/services/test_tool_text_renderer.py::test_override_is_session_isolated
• python -m pytest

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Codex Task

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📥 Commits

Reviewing files that changed from the base of the PR and between c03159e and 7105db6.

📒 Files selected for processing (2)

• src/core/services/tool_text_renderer.py (2 hunks)
• tests/unit/core/services/test_tool_text_renderer.py (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/fix-cross-session-data-leaks-5t8osa

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