refactor(session): unify event map augmentation entrypoint

packages/core/tools/src/code-mode.ts

@@ -15,7 +15,7 @@ import { defineTool, parameterSchemaSpecToJsonSchema } from './schema.ts'
 import { TOOL_REGISTRY_SCHEDULER } from './index.ts'
 import type { CodeDispatchLog, ToolDefinition, ToolExecutionResult, ToolRegistry, ToolRunContext } from './index.ts'
 
-declare module '@deepseek-ai/dsh-session' {
+declare module '@deepseek-ai/dsh-session/types' {
   interface SessionEventMap {
     /**
      * One sub-dispatch STARTING inside a `run_code` program: the parent