docs: split-domain handles idea + interop constraint for the trails check

Prompted by Hollo's split-domain setup. Two parts:

- docs/ideas/split-domain-handles.md: offering split handle/server
  domains to self-hosters is config-level work — Fedify's origin
  option natively accepts { handleHost, webOrigin } — and handles are
  permanent identity, so apex handles matter. Single-domain stays the
  default (Decision #18); post-launch polish.
- Interop constraint pinned in social-federation task 6.1 and
  route-federation's gating decision: the trails-to-trails NodeInfo
  check must run against the actor IRI's host after WebFinger
  resolution, never the handle's domain — split-domain remote
  instances would otherwise be wrongly refused.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ullrich Schäfer 2026-06-07 11:18:13 +02:00
parent 76b468d422
commit bf907976c4
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@ -89,3 +89,4 @@ See `docs/ideas/` for pre-spec explorations:
- `activity-participants.md` — tag co-riders on shared activities, confirm/decline, federated mentions
- `multi-day-collections.md` — activity collections for multi-day trips (architecture open question #1)
- `fediverse-enhancements.md` — post-v1 federation: map images in Notes, fediverse kudos, comments, Events/Mobilizon, Wanderer interop, federated explore
- `split-domain-handles.md``@bob@example.com` handles while the journal runs on a subdomain (Hollo/Mastodon-style; Fedify supports it natively)