feat: publish long-horizon agent chapter

src/pages/index.astro

@@ -14,6 +14,7 @@ const routes: Record<string, string> = {
   "long-context": "/long-context/",
   "post-training/alignment": "/post-training/alignment/",
   reasoning: "/reasoning/",
+  agents: "/agents/",
   "training-systems": "/training-systems/",
   "systems/numerics": "/systems/numerics/",
 };
@@ -91,6 +92,7 @@ const paths = [
           <a class="button" href="/long-context/">长上下文专题</a>
           <a class="button" href="/post-training/alignment/">后训练与偏好专题</a>
           <a class="button" href="/reasoning/">推理专题</a>
+          <a class="button" href="/agents/">Agent 专题</a>
           <a class="button" href="/training-systems/">训练系统专题</a>
           <a class="button" href="/systems/numerics/">数值与优化专题</a>
         </div>
@@ -102,7 +104,7 @@ const paths = [
         <div class="hero-stats">
           <div><b>16</b><span>核心专题</span></div>
           <div><b>151</b><span>K3 报告来源</span></div>
-          <div><b>280</b><span>关键论文索引</span></div>
+          <div><b>314</b><span>关键论文索引</span></div>
           <div><b>47p</b><span>K3 技术报告</span></div>
         </div>
       </aside>
@@ -116,6 +118,22 @@ const paths = [
 
   <section class="section compact release-section" id="new-chapters">
     <div class="release-grid">
+      <a class="release-card agent-release" href="/agents/">
+        <div>
+          <p class="eyebrow"><span>NEW / CHAPTER 12</span> AGENTS · TOOL USE · ENVIRONMENTS</p>
+          <h2>Agent 不是一个循环：格式正确、执行成功和任务完成是三道不同的门</h2>
+          <p>
+            用环境、工具、循环、规划、记忆、执行、验证、轨迹、归因、分布、系统、可靠性、评测与安全十四张账，
+            从 TextWorld、ReAct 和 Toolformer 走到 DeepSeek-V4 DSec 与 Kimi K3 百万 Token Agentic RL。
+          </p>
+        </div>
+        <dl>
+          <div><dt>LINEAGE</dt><dd>2018 → 2026</dd></div>
+          <div><dt>NODES</dt><dd>52 个一手节点</dd></div>
+          <div><dt>LAB</dt><dd>循环 · 契约 · 可靠性 · 长程 RL</dd></div>
+        </dl>
+        <span class="release-arrow" aria-hidden="true">从生成文字进入可验证行动 →</span>
+      </a>
       <a class="release-card alignment-release" href="/post-training/alignment/">
         <div>
           <p class="eyebrow"><span>NEW / CHAPTER 10</span> ALIGNMENT · PREFERENCE</p>
@@ -509,6 +527,7 @@ const paths = [
       transition: transform 180ms ease, border-color 180ms ease;
     }
 
+    .agent-release,
     .alignment-release,
     .transformer-release,
     .foundation-release,
@@ -521,6 +540,14 @@ const paths = [
       min-height: 510px;
     }
 
+    .agent-release {
+      background:
+        radial-gradient(circle at 82% 18%, rgba(56, 91, 128, 0.2), transparent 30%),
+        radial-gradient(circle at 62% 74%, rgba(76, 118, 112, 0.16), transparent 28%),
+        repeating-linear-gradient(90deg, transparent 0 58px, rgba(56, 91, 128, 0.04) 58px 59px),
+        var(--paper-raised);
+    }
+
     .alignment-release {
       background:
         radial-gradient(circle at 82% 18%, rgba(134, 76, 76, 0.2), transparent 30%),