2c3cfdbedc
- Fix a2ui-format.md schema to match renderer: rename 'options' → 'filters' in
filters block, replace 'active: boolean' with 'value: string' in filter options,
update form select options from string[] to {label, value}[] objects (Critical #1)
- Fix 3 failing tests in test_researcher_agent.sh to use @mention paths without .md
extension (Important #2)
- Complete pop-out feature in VisualBlock.handlePopOut() by posting render message
to popup window after 500ms initialization delay (Important #3)
- Update test_context_files.sh to match new a2ui-format.md schema (filters array
key check, value field check)