Lead with the observable contract (ctx.Done = graceful suspend,
return is *SuspendedError, framework shields downstream calls) and
mention agent.ErrSuspendForCheckpoint as the recommended cancel
cause for graceful-stop intent. Drop the leak of the WithoutCancel
mechanism — readers need the contract, not the strategy.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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