docs(openspec): archive social-federation; sync delta specs into main
The change shipped end-to-end (58/58 tasks; live on trails.cool since
2026-06-07, soaked against Mastodon and flagship⇄staging). Delta specs
synced into the mainline:
- specs/social-federation/spec.md created (8 requirements: actor
objects + WebFinger, signing keypairs, narrow inbox, outbox, push
delivery, trails-only outbound, poll ingestion, audience filtering)
- specs/social-follows/spec.md: social-activity-feed requirement
updated for remote rows + audience gating; pending lifecycle for
outbound remote follows added
- specs/public-profiles/spec.md: Pending follow-button state added
openspec validate --all: green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
d87a1e30c2