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/skill/tool-skill/src/index.ts

@@ -135,9 +135,7 @@ export function apply(ctx: Context, config: Config = {}): void {
   // Register after the tool so reverse teardown removes guidance first. Exact definition
   // identity prevents a scoped shadow merely named `skill` from inheriting this catalog.
   ctx.on('agent/pre-step', async (
-    agent: Agent,
-    _messages,
-    { signal },
+    { agent, signal },
     next,
   ): Promise<PreStepDecision> => {
     const decision = await next()

packages/skill/tool-skill/tests/tool-skill.spec.ts

@@ -86,8 +86,7 @@ async function fireStep(ctx: Context, agent: Agent, turn: number, step: number):
   const signal = new AbortController().signal
   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') {
@@ -105,8 +104,7 @@ async function proposeStep(
   const signal = new AbortController().signal
   return await agentEvents(ctx, agent).waterfall(
     'agent/pre-step',
-    messages,
-    { turn: 1, step: 1, signal },
+    { messages, turn: 1, step: 1, signal },
     () => Promise.resolve({ kind: 'enter' as const, messages }),
   )
 }
@@ -131,8 +129,7 @@ async function composePrefix(ctx: Context, cwd: string, signal = new AbortContro
 async function composePrefixForAgent(ctx: Context, agent: Agent, signal = new AbortController().signal): Promise<Message[]> {
   const decision = await agentEvents(ctx, agent).waterfall(
     'agent/pre-step',
-    [],
-    { turn: 1, step: 1, signal },
+    { messages: [], turn: 1, step: 1, signal },
     () => Promise.resolve({ kind: 'enter' as const, messages: [] }),
   )
   if (decision.kind === 'enter') {
@@ -234,7 +231,7 @@ describe('dsh-tool-skill', () => {
       source: 'runtime',
       content: 'User-only body.',
     })
-    ctx.on('agent/pre-step', async (_agent, _messages, _context, next) => {
+    ctx.on('agent/pre-step', async (_payload, next) => {
       const decision = await next()
       if (decision.kind === 'reject') return decision
       return {