docs: record game audio client main integration

.project-docs/20-architecture/data-flow.md

@@ -1,5 +1,21 @@
 # Data Flow
 
+## Game Audio generation and local delivery
+
+Project-enabled optional bundled Game Audio → frozen eligible parent tool → one explicit
+generation confirmation → Main durable pre-submit receipt → fixed Works Square hosted API.
+Main queries the original execution internally, then saves every output beneath
+`assets/generated/game-audio/<executionId>/` in the frozen original project. A lost POST
+response uses operation lookup; restart, account reconnect and download retry never submit
+another generation. The shared project write lease covers materialization/tracker only,
+not network waiting. Provider/billing status and local delivery status remain separate.
+
+The conversation card displays saved relative paths. An explicit preview click uses the
+receipt/account-owned Main route and existing bounded local media reader, then native
+audio controls with no autoplay. No Provider credential, URL, job ID or audio payload is
+sent to the model. Server migration 0093 and enabled authoritative prices are deployment
+prerequisites; synthetic media tests are not real Meowa acceptance.
+
 ## Code conversation metadata
 
 Main 的 `.makelore/conversations.json` schema v2 是 Conversation 标题和归档状态的唯一权威。新建自动命名会话由 Main 生命周期订阅从首条真实、完整用户消息提取标题；未命名会话的历史 hydration 可补齐同一次命名。串行存储重查 `titleMode` / `autoTitleSet`，手动命名和已删除记录不会被后续事件覆盖。内部命名字段不进入公共 DTO，也不向 Pi session title 双写。