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/subagent/subagent-inprocess/src/index.ts

@@ -75,7 +75,7 @@ function prePublicationAbort(): Error {
 /** Append one one-shot descriptor inside the child's initial turn before its first request. */
 function attachDescriptorAppend(childCtx: Context, descriptor: SubagentDescriptorData): void {
   let appended = false
-  childCtx.on('agent/pre-step', async (agent, _messages, _context, next) => {
+  childCtx.on('agent/pre-step', async ({ agent }, next) => {
     const decision = await next()
     if (!appended && decision.kind === 'enter') {
       appended = true