The first cut of the core ::preview consumer rendered the classic
preview-attachment card — a button into the right rail we already had, which
made the directive indistinguishable from an ordinary preview link. Now the
directive shows the thing itself: the workspace HTML file renders in a
sandboxed srcdoc iframe inline in the assistant message (opaque origin,
allow-scripts only — no reach into the app, its storage, or the bridge),
with an optional height attribute clamped to 120-1200px and the classic
card kept below as the rail escape hatch.
The frame waits for turn settle before reading the file (mid-stream it is
often mid-write), resolves relative paths against the session's own cwd,
and falls back to the plain card for non-HTML targets and remote gateways
(no local file door there).
Brooklyn Nicholson
8425f8286b