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/bind-agent-subscribers-only-in-agent-session.md

@@ -0,0 +1,26 @@
+---
+bc-version: [27..]
+domain: agents
+keywords: [agent-session, isagentsession, bindsubscription, system-initialization, singleinstance]
+technologies: [al]
+countries: [w1]
+application-area: [all]
+---
+
+# Bind extra agent subscribers only inside an agent session
+
+## Description
+
+Page-filter tweaks, extra validation, and prompt dialogs for the agent should not run for every user. `Agent Session.IsAgentSession` distinguishes agent UI sessions. Binding those subscribers on `System Initialization` only when the session is an agent session avoids global subscriber cost. Models register `SingleInstance` table subscribers unconditionally.
+
+## Best Practice
+
+On `OnAfterInitialization`, exit unless `Agent Session.IsAgentSession`. Then `BindSubscription` a single-instance codeunit that holds the current task id. Keep those subscribers internal.
+
+See sample: `bind-agent-subscribers-only-in-agent-session.good.al`.
+
+## Anti Pattern
+
+Event subscribers on `Sales Header` OnAfterInsert that always `Message` the agent, with no `IsAgentSession` guard. Detection signal: agent-only behaviour in a static subscriber that is not bind-gated.
+
+See sample: `bind-agent-subscribers-only-in-agent-session.bad.al`.