* MEDIA: tags parsed once, in the backend; clients get clean text plus attachments
tui_gateway runs the gateway's extract_media on the live stream (a tag's
line is held until it completes, then the file goes out on that delta),
on message.interim/message.complete, and on history through the shared
history projection (session.resume and the REST messages route). The wire
contract gets an attachments list on message.delta/interim/complete,
TranscriptMessage and InflightTurn.
Desktop renders attachments as data parts (media player or file card, HTML
included) and in group rooms; the TUI lists them as link rows. The three
renderer MEDIA: parsers (chat parts, speech text, Artifacts) and the TUI
MEDIA line parser are deleted. Stored rows keep their raw tags.
* Delete the ::preview directive and its prompt text
The inline HTML widget, its registration and its hidden-turn talk-back go;
an HTML file delivered with MEDIA: is a normal file card with preview. The
desktop and TUI platform hints now describe attachments. The
transcript.directives area stays for ::onboarding and ::ask.
* MEDIA stream splitter works per line; group mirrors and sync keep files; TUI shows a file row when its line completes
- MediaStreamSplitter splits each completed line once, carrying code-fence state, so
prose that says "media:", blank-line runs and [[audio_as_voice]] no longer stall
the stream, and cost stays linear in reply length.
- The partial-tag hold applies only at a token start (or to an upper-case prefix),
so words like "stream" are not held.
- Subagent child mirrors stream through a splitter too, flushed at tool and end.
- Group rooms: externally written rows and the ui_meta sync copy carry attachments;
the echo guard compares files as well as text.
- TUI: a delta that brings a new file seals the text so far with its file row.
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