docs(readme): add capability enum tagline (#190)

Add a third tagline line to both English and Chinese READMEs surfacing
the execution + production capabilities that the goal-first hook alone
does not signal: 9 native LLM adapters, MCP, token budgets, retries,
context compaction, live tracing.

The original "From a goal to a task DAG, automatically." line stays as
the differentiation thesis; the new line gives technical evaluators a
direct read on whether the framework covers their production checklist.

README.md

@@ -14,7 +14,8 @@
 
 <p align="center">
   <strong>From a goal to a task DAG, automatically.</strong><br/>
-  TypeScript-native multi-agent orchestration. Three runtime dependencies.
+  TypeScript-native multi-agent orchestration. Three runtime dependencies.<br/>
+  9 native LLM adapters · MCP · token budgets · retries · context compaction · live tracing.
 </p>
 
 <p align="center">

README_zh.md

@@ -14,7 +14,8 @@
 
 <p align="center">
   <strong>给一个目标，自动得到任务 DAG。</strong><br/>
-  原生 TypeScript 多智能体编排，3 个运行时依赖。
+  原生 TypeScript 多智能体编排，3 个运行时依赖。<br/>
+  9 个原生 LLM 适配器 · MCP · token 预算 · 重试 · 上下文压缩 · 实时追踪。
 </p>
 
 <p align="center">