feat(web-access): v3.0 内置浏览器能力面同步——删除 Python Playwright 回落（S31） (#85)

## 变更内容 / What

浏览器升级计划 S31 最终验收信号：web-access 技能与内置受管浏览器新能力面对齐，**删除「用户手工启动调试 Chrome +
Python Playwright」回落路径**。

- **删除回落路径**：Prerequisites: Chrome CDP Setup、Layer 3 CDP Browser（Python
Playwright 模板）、Installation Note（pip install
playwright）整段删除；references/cdp-browser.md 文件删除；jina-reader.md 的 CDP 引用改为
page.extract-text
- **订正陈旧断言**：
- 「没有批量取文通道」→ BrowserSnapshot mode:text /
page.extract-text（maxBytes/cursor 分页，超出截断给 nextCursor）
- 「page.evaluate 基本不可用」→ 返回真实值（expression/awaitPromise，超预算截断标
truncated）；仍走人工闸门
- 「截图前必须 tab.activate / 串行截图 / BROWSER_TAB_HOST_NOT_FOUND」→ S36 订正：Agent
单标签会话免 activate；多标签后台 tab 秒级报 BROWSER_VIEWPORT_UNAVAILABLE；命令超时只 stop 不
close，标签页可重试
  - 「accessibility 超限即失败」→ 尊重 depth + maxBytes 截断翻页（S8）
  - 「只有整页截图」→ clip{x,y,width,height,scale≤4} + captureBeyondViewport
- **provides.tools 加 BrowserScript**（code-mode；信任级别等同 Bash）
- **新增选用规则（D4 唯一约束机制）**：反检测站点一律优先 input.*（#1808 输入拟真 +
身份一致性）；page.element 写类仅用于表单批量填充等站点不检测场景；JS 直调 el.click() 为禁止回退
- **新增 fetch.browser 配方**：page.evaluate 页面上下文跑 fetch（带 origin Cookie、同
origin、受 Grant origins 约束）——登录态取站内接口的正解
- **能力速查**：page.element 九 op / page.wait 九 until / inline wait 块 / loc=
方言 / BrowserScript / 跨源 iframe 快照（S35）
- **版本** 2.2.1 → 3.0.0（删除回落层为 breaking）；source_hash
重算；required_client_version 维持 10.0.98（新能力在正文标注 10.0.112+）

## Why

v2.x 时代回落路径存在的每一条理由（无批量取文、evaluate 不可用、截图必须串行 activate）均已被
S2–S14/S35/S36 覆盖；文档继续引导用户手工起调试 Chrome 会误导新 Agent 走已废弃路径。

双语同步修改（SKILL.md / SKILL.zh-CN.md heading 数一致，i18n-validate 通过）。

- [x] CLA

skills/web-access/references/jina-reader.md

@@ -95,19 +95,8 @@ curl -sL "https://r.jina.ai/$URL" > /tmp/jina-cache.md
 ### Handle very long articles
 Jina returns the full article in one response. For articles > 50K chars, pipe through `head` or extract specific sections with Python/awk before feeding back to the model context.
 
-### Combine with CDP
-When you use L3 CDP to fetch a login-gated page, you can pipe the resulting HTML through Jina for clean Markdown instead of parsing with BeautifulSoup:
-
-```python
-html = fetch_with_cdp(url)  # from references/cdp-browser.md
-# Now convert via Jina (note: Jina fetches the URL itself, not your HTML)
-# So this only works if the content is already visible without login:
-import subprocess
-md = subprocess.run(["curl", "-sL", f"https://r.jina.ai/{url}"],
-                    capture_output=True, text=True).stdout
-```
-
-For truly login-gated content, you must parse the HTML directly (BeautifulSoup) since Jina can't log in on your behalf.
+### Combine with the built-in browser
+For login-gated pages, the built-in browser already has its own extraction channel with paged budgets — `BrowserAct({ action: 'page.extract-text', params: { format: 'markdown', maxBytes: 65536 } })` returns clean Markdown directly (beyond maxBytes it truncates and hands back a nextCursor). Jina can't log in on your behalf, so use Jina for public pages and `page.extract-text` for logged-in ones; there is no need to round-trip HTML through Jina anymore.
 
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