live-events §4.4 and §4.5: a chat and a reaction may state an origin after their last
field (1 human, 2 machine, 3 machine-reviewed, with the model's digest for 2 and 3), as a
caption does. live-rooms §4.4: the grant attribute `ai` names the model that acts for an AI
participant; §9.2 step 6 refuses its chat, reaction or caption that does not state origin 2
or 3 with that model (`ai_unmarked`), and a relay does not forward one. Both corpora gain
vectors (additions only); both second implementations read the new fields.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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