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/context/time-context/src/index.ts

@@ -157,9 +157,7 @@ export function apply(ctx: Context, config: Config): void {
   const resolvedTimeZone = formatter.resolvedOptions().timeZone
 
   ctx.on('agent/pre-step', async (
-    agent: Agent,
-    _messages,
-    { turn, step, signal },
+    { agent, turn, step, signal },
     next,
   ): Promise<PreStepDecision> => {
     const decision = await next()

packages/context/time-context/tests/time-context.spec.ts

@@ -82,8 +82,7 @@ async function fire(
 ): Promise<void> {
   const decision = await agentEvents(ctx, agent).waterfall(
     'agent/pre-step',
-    [],
-    { turn, step, signal },
+    { messages: [], turn, step, signal },
     () => Promise.resolve({ kind: 'enter' as const, messages: [] }),
   )
   if (decision.kind === 'enter') {
@@ -366,7 +365,7 @@ describe('real agent-loop request history', () => {
   ] as const)('does not commit a preparation reading when a downstream pre-step listener %s', async (mode) => {
     const adapter = new ScriptedAdapter([textResponse('unused')])
     const ctx = await loopHarness(adapter)
-    ctx.on('agent/pre-step', (subject, _messages, _context, next) => {
+    ctx.on('agent/pre-step', ({ agent: subject }, next) => {
       if (mode === 'throws') throw new Error('later pre-step failure')
       subject.cancel({ kind: 'user' })
       return next()