Resolves the open items from the latest PR #143 code review:
- test(page): cover the four agentSourceFields stamp sites (create, update,
movePage, movePageToSpace) with agent + normal-user payload assertions;
add findById({ includeIsAgent: true }) wiring guards to the JWT and collab
auth-seam specs so a future drop of the option is caught.
- fix(privacy): drop `isAgent` from UserRepo.baseFields and gate it behind a
new opt-in `findById({ includeIsAgent })`, requested only by the two auth
seams that derive provenance — stops the flag leaking via the workspace
member list and generic user payloads.
- docs: correct the agentSourceFields JSDoc and the two UPDATE-site comments
to distinguish INSERT (omitted column → DB default 'user') from UPDATE
(omitted column → existing value kept, Kysely writes only present keys).
- style(page): collapse three stray double blank lines left by an earlier edit.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>