Agent profiles (AGENTS.md): per-org library, free builtins, versioning, marketplace, persona

Reusable agent definitions authored as AGENTS.md (YAML frontmatter + a Markdown body that becomes
the agent's operating guide). Mirrors the skill library, including its review hardening.

- AgentProfile entity (OrgBoard): org-scoped + versioned by (OrganizationId, ProfileKey, Version),
  NULLS NOT DISTINCT unique index; Origin Builtin|Authored|Installed; ProfileVisibility +
  ProfileStatus with the Public⟹Published invariant enforced in Apply()/SetVisibility(). AGENTS.md
  parser (YamlDotNet). AgentProfileWriter is the single upsert path (insert-only mode for install).
- Free builtins: AgentProfileSeeder seeds Aria (PO), Quill (QA), Edison (backend) on startup via a
  new IStartupSeeder + SeederRunner (runs after migrations). Idempotent, null-org, visible to all.
- Endpoints (/api/orgboard/agent-profiles): upload, list (resolvable-winner order), get versions,
  publish/unpublish, fork, marketplace (per-(key,version) AlreadyInLibrary), install (insert-only →
  clean 409, no clobber). ConfigureAgents to author/manage; ViewBoard to browse; audited.
- Persona: Agent gains Persona; ConfigureAgent stores it; AgentRunContext carries it; PromptAssembler
  injects it as "# Operating guide" (data, not instructions) so an applied profile shapes the run.
- Client: Agent profiles page (library + marketplace tabs, upload editor, publish/unlist/fork/install),
  routed + in the nav.

Verified: ArchitectureTests 8/8, IntegrationTests 55/55 (new AgentProfilesTests: builtins seeded,
upload + validation, publish, cross-org marketplace list→install→private copy, duplicate 409, per-
version flag, Member 403; persona renders as the operating guide), client build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Modules/TeamUp.Modules.OrgBoard/Endpoints/OrgBoardEndpoints.cs

@@ -36,6 +36,8 @@ internal static class OrgBoardEndpoints
         group.MapGet("/seats/{id:guid}/agent", GetAgent).RequireAuthorization();
 
         group.MapGet("/performance", PerformanceEndpoints.Get).RequireAuthorization();
+
+        AgentProfileEndpoints.MapTo(group);
     }
 
     private static TaskResponse ToResponse(WorkItem item) => new(
@@ -343,7 +345,7 @@ internal static class OrgBoardEndpoints
 
     private static AgentResponse ToAgent(Agent agent) => new(
         agent.Id, agent.SeatId, agent.Name, agent.Monogram, agent.Autonomy.ToString(),
-        agent.ApiConfigId, agent.FallbackApiConfigId, agent.SkillKeys, agent.McpServerIds, agent.Docs);
+        agent.ApiConfigId, agent.FallbackApiConfigId, agent.SkillKeys, agent.McpServerIds, agent.Docs, agent.Persona);
 
     private static async Task<IResult> CreateSeat(
         CreateSeatRequest request, ICurrentUser user, IPermissionService permissions,
@@ -422,7 +424,8 @@ internal static class OrgBoardEndpoints
         agent ??= new Agent(seat.Id, now);
         agent.Configure(
             request.Name.Trim(), request.Monogram, request.Autonomy, request.ApiConfigId,
-            request.FallbackApiConfigId, request.SkillKeys ?? [], request.McpServerIds ?? [], request.Docs ?? [], now);
+            request.FallbackApiConfigId, request.SkillKeys ?? [], request.McpServerIds ?? [], request.Docs ?? [],
+            string.IsNullOrWhiteSpace(request.Persona) ? null : request.Persona.Trim(), now);
 
         if (isNew)
         {