Senders can now force the recipient agent to wake on receipt regardless
of the recipient's `messageResponseMode`. Surfaced as a "Wake recipient
immediately" checkbox in MessageComposer and as a `wake_recipient`
boolean param on the `fn_send_message` agent tool. Carried as
`metadata.wakeRecipient: true` on the message; the heartbeat hook
treats forced wakes as `message_received_urgent` in the wake delta so
agents can distinguish them from normal `messageResponseMode: immediate`
wakes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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