The posted SEP-1913 umbrella comment was updated to match the shipped
structure: two extensions plus a schemes/ folder, with FIDES as one
data-labelling scheme (ifc.fides.v1) rather than an extension/profile.
Bring docs/intent-comment.md back in sync as the source of record and
add the three stacked PR links (#2 base, #3 action-metadata, #4 FIDES
scheme).
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>