Document sharing agents and whose access what they use runs with

A new "Sharing agents and what they use" section covers viewers and
editors, whose access each tool, source and prompt runs with as the share
dialog labels it, sponsors, stopped resources, what API, widget and
public-link users can't do without the write allowlist, the wiki switch
and research steps. The sharing rules now mention the editor switches and
member-mode tools, the guardrails page no longer says editors can't
change guardrails, the connector guide uses the new tool share labels,
and related pages link to the section.

docs/content/Sources/Wiki-sources.mdx

@@ -114,5 +114,5 @@ PUT /api/sources/<source_id>/wiki/settings   # owner only; body {"allow_outside_
 ## Related
 
 - [Per-Source Configuration](/Sources/Per-source-configuration) — exposure and retrieval settings a wiki uses.
-- [Access Control & Teams](/Deploying/Access-Control) — sharing a wiki with a team.
+- [Access Control & Teams](/Deploying/Access-Control) — sharing a wiki with a team, and [what an agent's users reach](/Deploying/Access-Control#sharing-agents-and-what-they-use) when you share the agent.
 - [Connectors](/Guides/Connectors#agents-used-through-an-api-key) — what else an agent can and can't do for API, widget and public-link users.