Mark comments (and, via existing page provenance, pages) created under an
is_agent service account as authored by AI, derived from the SIGNED server
identity rather than any client field, and render the existing AI badge in
the comments sidebar.
Backend (B1):
- Add additive users.is_agent boolean (default false) migration; reflect in
the Users Kysely type, the user repo baseFields, and (via Selectable) the
User entity.
- jwt.strategy: derive req.raw.actor from user.isAgent (an is_agent account
stamps every write 'agent'); external MCP has no internal ai_chats row so
aiChatId stays null. Non-spoofable: a plain user cannot obtain
created_source='agent'.
- Loosen the provenance aiChatId type to string|null across token.service and
the JwtPayload/JwtCollabPayload claims (type-level only; the internal AI-chat
path still passes a real aiChatId).
Frontend (B2):
- Extend IComment with createdSource/aiChatId/resolvedSource (backend already
returns them via selectAll).
- Extract the local AiAgentBadge from history-item into a shared
components/ui/ai-agent-badge.tsx (clickable deep-link when aiChatId present,
plain label when null/absent); reuse it in history-item and render it in
comment-list-item next to the author name when createdSource==='agent'.
Tests: comment.service agent/null-aiChatId provenance, jwt.strategy provenance
derivation + anti-spoof, AiAgentBadge clickable/non-clickable branches, and
comment-list-item badge render/no-render.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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