Promotes the deltas from openspec/changes/add-explore-page/ into
top-level specs after the implementation landed in #321.
- New top-level spec: openspec/specs/explore/spec.md (paginated local
user directory at /explore, with the "Active recently" sub-section,
exclusion rules for private profiles and the demo persona, offset
pagination, and the navbar entry rule).
- Updated openspec/specs/journal-landing/spec.md with the new
"Visitor home links to /explore" requirement.
- Updated openspec/CAPABILITIES.md with an entry under Social.
- Moved openspec/changes/add-explore-page/ to
openspec/changes/archive/2026-04-26-add-explore-page/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
a3b0c6ad56