Document Variant B for showing MCP-created comments (and pages) as AI
rather than as the service-account user, reusing the existing agent
provenance infrastructure (§15 C3).
- Root cause: MCP logs in via a plain service-account token, so
provenance.actor stays 'user' and created_source defaults to 'user';
the comment sidebar also renders no AI badge.
- B1 (backend): mark the MCP identity as agent via a new users.is_agent
flag; jwt.strategy derives req.raw.actor from it (non-spoofable).
Relax the provenance aiChatId type to string | null for external MCP.
- B2 (frontend): extend IComment with createdSource/aiChatId, extract a
shared AiAgentBadge, render it in comment-list-item.
- Includes edge cases, tests, scope decisions, and acceptance criteria.
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