Fix failing send-path expectation in tests.test_quic_recovery_live_runtime_integration

[MichaelDecent]

Summary

tests.test_quic_recovery_live_runtime_integration currently has a failing runtime-send-path assertion in test_handler_defers_and_flushes_recovery_blocked_datagrams.

Reproduction

uv run python -m unittest -v tests.test_quic_recovery_live_runtime_integration

Current result

• Ran: 4 tests
• Failures: 1
• Failing test:
  • test_handler_defers_and_flushes_recovery_blocked_datagrams

Failure details

At:

• tests/test_quic_recovery_live_runtime_integration.py:89

Assertion:

self.assertEqual(len(session.pending_outbound), 1)

Observed:

• len(session.pending_outbound) == 0
• failure: AssertionError: 0 != 1

Notes

The other three tests in this module pass, suggesting behavior drift is localized to the deferred/flush outbound queue expectation for the recovery-blocked datagram path.

Acceptance criteria

• Align test expectation and runtime behavior for recovery-blocked datagram deferral/flush semantics.
• uv run python -m unittest -v tests.test_quic_recovery_live_runtime_integration passes.