refactor(agent): unify agent-scoped event signatures as payload objects

All agent/* and agent-loop/config-start-failed events take one payload
object carrying the agent subject; waterfall/serial payloads require a
signal and keep next as the final argument. PreStepContext and
RequestFailureContext are unfolded into payloads and retired.
goal/changed follows the same shape so agentEvents keeps its listener
error containment. ReactLoopAgent builds its scope carrier once in the
constructor. Regenerates scope resolvers, tool-cordis api catalog, and
docs catalogs; updates all affected listeners, tests, and the
core-data-structures docs (en + zh).

packages/ui/jsonrpc/tests/server.spec.ts

@@ -254,8 +254,8 @@ describe('HarnessSdkServer', () => {
       session,
     } satisfies Pick<Agent, 'id' | 'session'>) as Agent
 
-    ctx.emit('agent/status', agent, 'running')
-    ctx.emit('agent/status', agent, 'idle')
+    ctx.emit('agent/status', { agent, status: 'running' })
+    ctx.emit('agent/status', { agent, status: 'idle' })
 
     expect(transport.notifications.filter(notification => notification.method === 'session.status'))
       .toEqual([