Introduce the scope peer namespace (scope__<name>) and the authoritative
{"kind": "scope"} configuration flag, plus the server-side guardrails:
- src/utils/scopes.py: single source of truth for the prefix, kind flag,
and name helpers (scope_peer_name / is_scope_peer_name /
scope_name_from_peer / validate_no_scope_peer_names)
- reject reserved-prefix names on peer get-or-create (422)
- reject scope peers as message authors in crud.create_messages (422)
- reject scope peers as chat/representation targets (422); a scope peer
as the path-level observer is deferred to Phase 2b
- reject scope peers on the generic session-peer add/set/remove routes
and the session-create peers mapping (422, directing to scopes routes)
- peers.list excludes scope peers by default; new PeerGet.kind option
("scope" | "all") switches the view via a configuration JSONB filter
- schemas: Scope / ScopeCreate / ScopeSessions(Add) and
SessionCreate.scopes (unprefixed scope names, validated)
Part of DEV-1997 (Scopes RFC DEV-1970).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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