docs: gate post-1.0 host acceleration as do-not-implement

Clarify in the post-1.0 record and the public status page that host-native
acceleration / host display is a stretch goal we are only considering:
do not block on it, pursue it, or design around it. It is never reached
automatically, requires an explicit human decision after all baseline goals
are complete (and only once there is no known risk), and may be scrapped on
architectural grounds. No aspect of the baseline software may be designed
toward it. No baseline design or code changes.

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