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/telemetry/session-telemetry/src/coordinator.ts

@@ -89,7 +89,7 @@ export class TelemetryCoordinator {
         this.hintFlush(session)
       })
     })
-    ctx.on('agent/error', (agent, turn, step, error) => {
+    ctx.on('agent/error', ({ agent, turn, step, error }) => {
       this.contain(() => {
         this.relayAgentError(agent, turn, step, error)
       })