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/goal/tool-goal/tests/tool-goal.spec.ts

@@ -399,7 +399,7 @@ describe('goal tool state transitions', () => {
     let turn = openTurn(root, { kind: 'user' })
     const created = ctx.goals.create(root.agent, { objective: 'continue later' })
     closeTurn(root, turn)
-    agentEvents(ctx, root.agent).emit('agent/session-start', 'resume')
+    agentEvents(ctx, root.agent).emit('agent/session-start', { source: 'resume' })
     expect(ctx.goals.get(root.agent)?.activation).toBe('disarmed')
     turn = openTurn(root, { kind: 'user' }, '继续')
     const resumed = await execute(ctx, 'update_goal', {