fix(start-work): restore atlas handoff

Keep native /start-work resolvable on Sisyphus, but switch the work session back to Atlas when Atlas is registered. Stamp the outgoing agent with Atlas's actual list-display key so config→start-work execution resolves correctly and still falls back to Sisyphus when Atlas is unavailable.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/plugin-interface.ts

@@ -4,6 +4,7 @@ import type { OhMyOpenCodeConfig } from "./config"
 import { createChatParamsHandler } from "./plugin/chat-params"
 import { createChatHeadersHandler } from "./plugin/chat-headers"
 import { createChatMessageHandler } from "./plugin/chat-message"
+import { createCommandExecuteBeforeHandler } from "./plugin/command-execute-before"
 import { createMessagesTransformHandler } from "./plugin/messages-transform"
 import { createSystemTransformHandler } from "./plugin/system-transform"
 import { createEventHandler } from "./plugin/event"
@@ -42,6 +43,10 @@ export function createPluginInterface(args: {
 
     "chat.headers": createChatHeadersHandler({ ctx }),
 
+    "command.execute.before": createCommandExecuteBeforeHandler({
+      hooks,
+    }),
+
     "chat.message": createChatMessageHandler({
       ctx,
       pluginConfig,