feat: publish agent-first git platform research

public/articles/agent-first-git-platforms/platform-positioning.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="1440" height="900" viewBox="0 0 1440 900" role="img" aria-labelledby="title desc">
+  <title id="title">Git 平台 Agent 集成与治理骨架定位图</title>
+  <desc id="desc">横轴为官方 Agent 集成连续性，纵轴为 Git 治理与自托管控制力。GitHub.com、GitLab、Bitbucket Cloud 属 Agent 集成较强；GitLab Self-Managed 与 Bitbucket Data Center 治理和自托管较强；Gitea 和 Forgejo 是开放控制骨架。位置表达研究判断而非加权得分。</desc>
+  <defs>
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+      .bg{fill:#f7f9fc}.grid{stroke:#d7deea;stroke-width:2}.axis{stroke:#475569;stroke-width:3;marker-end:url(#a)}.t{font:500 20px -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;fill:#475569}.title{font:700 34px -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;fill:#111827}.bubble{stroke-width:3}.bt{font:700 21px -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;fill:#172033}.level{font:600 17px -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;fill:#475569}.cloud{fill:#e8f1ff;stroke:#4776c6}.integrated{fill:#e7f8ef;stroke:#37956a}.open{fill:#fff4e6;stroke:#dc7d29}.legacy{fill:#f1edff;stroke:#725bb4}
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+    <marker id="a" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="8" markerHeight="8" orient="auto"><path d="M0 0L10 5L0 10z" fill="#475569"/></marker>
+  </defs>
+  <rect class="bg" width="1440" height="900" rx="28"/>
+  <text class="title" x="82" y="70">内置 Agent 与强治理是两条轴，不是同一件事</text>
+  <text class="t" x="82" y="108">位置是基于 S1–S8 的相对判断，不是采购总分；所有 L2 仍存在连续性断点。</text>
+  <line class="grid" x1="190" y1="690" x2="1320" y2="690"/><line class="grid" x1="190" y1="495" x2="1320" y2="495"/><line class="grid" x1="190" y1="300" x2="1320" y2="300"/>
+  <line class="grid" x1="480" y1="150" x2="480" y2="760"/><line class="grid" x1="770" y1="150" x2="770" y2="760"/><line class="grid" x1="1060" y1="150" x2="1060" y2="760"/>
+  <line class="axis" x1="190" y1="760" x2="1335" y2="760"/><line class="axis" x1="190" y1="760" x2="190" y2="135"/>
+  <text class="t" x="1020" y="818">官方 Agent 集成连续性 →</text><text class="t" transform="translate(86 575) rotate(-90)">Git 治理与自托管控制力 →</text>
+  <text class="level" x="205" y="795">外部组装</text><text class="level" x="1198" y="795">原生/官方路径</text>
+  <text class="level" x="108" y="715">基础</text><text class="level" x="108" y="190">强</text>
+  <g><rect class="bubble integrated" x="865" y="242" width="260" height="78" rx="24"/><text class="bt" x="891" y="276">GitLab.com / SM</text><text class="level" x="891" y="303">L2 · 治理强，运行连续性有缺口</text></g>
+  <g><rect class="bubble cloud" x="1030" y="410" width="238" height="78" rx="24"/><text class="bt" x="1056" y="444">GitHub.com</text><text class="level" x="1056" y="471">L2 · Agent UX 强，S7 未闭合</text></g>
+  <g><rect class="bubble cloud" x="840" y="540" width="270" height="78" rx="24"/><text class="bt" x="866" y="574">Bitbucket Cloud</text><text class="level" x="866" y="601">L2 · 多产品拼接，Beta 依赖高</text></g>
+  <g><rect class="bubble legacy" x="350" y="260" width="312" height="78" rx="24"/><text class="bt" x="376" y="294">Bitbucket Data Center</text><text class="level" x="376" y="321">L1 · 治理骨架强，Agent 外置</text></g>
+  <g><rect class="bubble open" x="445" y="405" width="226" height="78" rx="24"/><text class="bt" x="471" y="439">Gitea OSS</text><text class="level" x="471" y="466">L1 · 官方 MCP + 强硬门</text></g>
+  <g><rect class="bubble open" x="275" y="505" width="222" height="78" rx="24"/><text class="bt" x="301" y="539">Forgejo</text><text class="level" x="301" y="566">L1 · 开放骨架，编排自建</text></g>
+  <g><rect class="bubble legacy" x="565" y="620" width="286" height="78" rx="24"/><text class="bt" x="591" y="654">Azure DevOps Services</text><text class="level" x="591" y="681">L1 · Boards Agent 实际写 GitHub</text></g>
+  <g><rect class="bubble legacy" x="260" y="650" width="252" height="78" rx="24"/><text class="bt" x="286" y="684">GHES / Azure Server</text><text class="level" x="286" y="711">L1 · 治理可用，Agent 路径缺失</text></g>
+  <rect x="860" y="155" width="455" height="55" rx="14" fill="#fff" stroke="#d7deea" stroke-width="2"/>
+  <text class="level" x="882" y="189">右上角不等于 L3：还需同一 revision 的失败恢复与独立授权收据</text>
+</svg>