[Saksham1105]

Summary

• Treat a missing LLM response body as an empty summary instead of raising AttributeError.
• Preserve the existing truncated-event fallback when the provider returns no text.
• Add a regression test asserting that content=None does not persist a [Compression failed ...] message.

Fixes #121

Testing

• Added regression coverage in tests/test_phase8.py.
• Tests have not been executed in this environment; please rely on CI for runtime verification.

[knight22-21]

Thanks for the fix, @Saksham1105! Handling None in response content during session compression cleanly avoids AttributeError and preserves the truncated-event fallback.

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