The Research-complete one-liner is now a native <details> disclosure:
collapsed it reads exactly as before (Research · complete · N sources);
one click expands the full persisted brief + source links via
ResearchBriefCard. No fetch, no state, no protocol change — the
data-subagent-artifact part in the record is the single source of truth,
which is what made this affordance 'feasible later' back in wave 1.
The brief still never clutters the transcript by default; the teacher's
wake turn remains the primary channel for weaving it into the lesson.
Test updated: the brief + sources now assert PRESENT inside the details
(and collapsed — no open attribute) instead of absent from the DOM.
Gates: typecheck, 279/279 tests, lint, build — all green.
amosblomqvist
afba6261a2