Delete scout and jimmy; Myra is the one default agent

Removes agents/scout, agents/jimmy, and workflows/diligence-brief
(scout's only consumer), plus their references across the tool
registry, workflow catalog, connection-pinned-by list, chat-ui's
invite dialog, and docs. agents/assistant's prompt.ts is renamed to
system-prompt.ts for consistency with the trim agent-package shape.

Author: TheGreatAxios

AGENTS.md

@@ -22,6 +22,10 @@ grants); the hub never seeds data on a client's behalf.
   `apps/*` belongs in a package. `workflows/*` are plain npm-shaped packages,
   deployable to any stock Interchange hub through the stock deploy route —
   this repo does not publish them to npm.
+- **Myra is the one default agent.** `agents/assistant` is the assistant
+  that uses Workbench on the person's behalf; every agent package under
+  `agents/*` is trim — `index.ts` (plus `system-prompt.ts` when the prompt
+  is large) — with no agent-owned artifact client/tool code of its own.
 - **No fallbacks.** Cut over cleanly — never leave a legacy path beside a
   new one. Config/manifest objects are explicit literals; the one exception
   is an optional key under `exactOptionalPropertyTypes` (see below), where

agents/assistant/package.json

@@ -16,7 +16,7 @@
   "type": "module",
   "exports": {
     ".": "./src/index.ts",
-    "./prompt": "./src/prompt.ts"
+    "./prompt": "./src/system-prompt.ts"
   },
   "publishConfig": {
     "access": "public"

agents/assistant/src/index.ts

@@ -33,14 +33,14 @@ import {
   ASSISTANT_SYSTEM_PROMPT,
   ASSISTANT_TOOL_PACKAGE_PINS,
   ASSISTANT_WORKFLOW_ID,
-} from "./prompt";
+} from "./system-prompt";
 
 export {
   ASSISTANT_STEP_ID,
   ASSISTANT_SYSTEM_PROMPT,
   ASSISTANT_TOOL_PACKAGE_PINS,
   ASSISTANT_WORKFLOW_ID,
-} from "./prompt";
+} from "./system-prompt";
 
 /**
  * Everything the definition needs that is per-deployment data. The