新增转述回合引擎，用插入工具把对话落成带相对序的产物。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/dictate/index.ts

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+export { buildDictateSystemPrompt, DICTATE_SYSTEM_PROMPT } from "./prompt.js";
+export {
+  CREATION_INTAKE_MODE_TAG,
+  DICTATE_MODE_VALUE,
+  DICTATE_ORDER_META_KEY,
+  isDictateModeValue,
+  isAllowedProductTag,
+  defaultDictateOrder,
+  effectiveDictateOrder,
+  compareDictateProducts,
+  sortDictateProducts,
+  parseDictateOrder,
+  type DictateProduct,
+  type DictateChatTurn,
+} from "./types.js";
+export {
+  buildDictateMessages,
+  extractDictateDialogue,
+} from "./context.js";
+export { DICTATE_TOOL_DEFINITIONS } from "./tools.js";
+export { runDictateTurn, type DictateTurnResult } from "./turn.js";