Add an optional `notice` prop (React.ReactNode) to AgentDockProps, rendered
as quiet fine-print under the composer. Lets a host app surface a privacy /
data-handling notice next to the input without the dock owning the copy.
Default undefined — no change for apps that don't pass it.
Also fix a latent crash: a "Try saying" starter suggestion called
sendMessage(s) with a single argument, but sendMessage(display, wire)
immediately does wire.trim() — clicking a suggestion threw on undefined.
Pass (s, s) since a suggestion's display and wire text are identical.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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