Update README and documentation for deck framework directives

- Clarified DECK_FRAMEWORK_DIRECTIVE description in both English and Chinese README files to specify conditions for deck kind without a skill seed.
- Added detailed workflow instructions in deck-framework.ts to emphasize the importance of copying the framework before adding content.
- Enhanced discovery.ts to reinforce the framework-first approach for deck projects.
- Updated system.ts to ensure proper handling of deck projects with and without bound skills, preventing re-authorship of scaling and navigation logic.

README.zh-CN.md

@@ -211,7 +211,7 @@ DISCOVERY 指令         （turn-1 表单、turn-2 品牌分支、TodoWrite、
   + 激活的 SKILL.md    （19 套备选）
   + 项目元数据          （kind、fidelity、speakerNotes、animations、灵感 system id）
   + Skill 副文件       （自动注入 pre-flight：先读 assets/template.html + references/*.md）
-  + （仅 deck 模式）    DECK_FRAMEWORK_DIRECTIVE   （nav / counter / scroll / print）
+  + （deck kind 且无 skill 种子时） DECK_FRAMEWORK_DIRECTIVE   （nav / counter / scroll / print）
 ```
 
 每一层都可组合。每一层都是一个你能改的文件。看 [`src/prompts/system.ts`](src/prompts/system.ts) 和 [`src/prompts/discovery.ts`](src/prompts/discovery.ts) 就知道真实契约长什么样。