feat(community/agents): add AL agent quality guidance

- add 20 agent knowledge rules with good and bad AL samples
- clarify setup dialog shape, temporary persistence, permissions, profiles, instructions, capability registration, and interface wiring
- add the community-owned AL agents review skill
- make review fixture discovery layer-aware with custom, community, and Microsoft precedence
- document layer-aware evaluation behavior

community/knowledge/agents/agent-permissions-intersect-with-assigner.md

@@ -0,0 +1,30 @@
+---
+bc-version: [27..]
+domain: agents
+keywords: [permissions, assigner, intersection, user-card, least-privilege]
+technologies: [al]
+countries: [w1]
+application-area: [all]
+---
+
+# Agent permissions intersect the assigner's; agents cannot configure users
+
+## Description
+
+An agent is a user, but it cannot configure users or other agents, and it cannot open sensitive pages such as user cards or permission-set assignment. Effective rights are the intersection of the assigning user's permissions and the agent's permission sets. Granting the agent a wide set does not bypass the assigner's limits, and a wide assigner still cannot give the agent user-admin powers the platform forbids.
+
+## Best Practice
+
+Document that intersection. Give the agent only the table and page rights its tasks need. Do not add user-setup or permission-assignment pages to the agent profile or permission sets; those operations will fail by design.
+
+See sample: `agent-permissions-intersect-with-assigner.good.al`.
+
+## Anti Pattern
+
+Permission sets or profiles that include User card, Permission Set Assignment, or agent-admin pages, or comments that the agent runs as SUPER regardless of who assigned it. Detection signal: default access controls or profile including user-administration objects.
+
+See sample: `agent-permissions-intersect-with-assigner.bad.al`.
+
+## See also
+
+`get-default-access-controls-least-privilege.md` covers the permission sets assigned when an agent instance is created.