Two additions:
- agent_test.go's "context cancellation triggers graceful suspend"
now also asserts the input messages land in the suspension
checkpoint — verifies the embedded-Checkpoint path that fires
when no Checkpointer is configured.
- cancel_test.go gets a third subtest that parks the LLM provider
inside ChatCompletion via a release channel, cancels ctx while
the call is in flight, then confirms the LLM call still saw a
non-cancelled ctx and the just-completed turn lands in the
persisted checkpoint. Proves the framework's WithoutCancel
shielding works end-to-end at the unit level.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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