fix(stealth): 修复 headed 模式下 stealth 失效并统一策略

- 修复 launch 协议未透传 stealth 导致 --headed 下补丁失效的问题\n- 在 BrowserManager 引入 StealthPolicy，统一 local/CDP/provider 能力决策\n- 增加 launch 返回 stealth 状态并在 --debug 输出连接类型与能力\n- 补充 local/CDP 回归测试与 bot.sannysoft.com 自动检查脚本\n- 同步 README、CLI help、技能文档与 CDP 文档中的 stealth 能力矩阵

docs/src/app/cdp-mode/page.mdx

@@ -75,6 +75,23 @@ Or set it globally via config or environment variable:
 AGENT_BROWSER_COLOR_SCHEME=dark agent-browser --cdp 9222 open https://example.com
 ```
 
+## Stealth behavior
+
+`--stealth` is enabled by default across connection modes, but capabilities depend on how you connect:
+
+<table>
+  <thead>
+    <tr><th>Connection type</th><th>Stealth capabilities</th></tr>
+  </thead>
+  <tbody>
+    <tr><td>Local launch</td><td>Chromium launch args + context init scripts</td></tr>
+    <tr><td>CDP / auto-connect</td><td>Context init scripts</td></tr>
+    <tr><td>Cloud providers</td><td>Context init scripts (Kernel may also apply provider-managed stealth)</td></tr>
+  </tbody>
+</table>
+
+Use `--debug` to print the active connection type and applied stealth capabilities.
+
 ## Use cases
 
 This enables control of:

docs/src/app/commands/page.mdx

@@ -95,6 +95,7 @@ agent-browser find nth 2 ".card" hover
 ```bash
 agent-browser wait <selector>         # Wait for element
 agent-browser wait <ms>               # Wait for time
+agent-browser wait 2000-5000          # Random wait between 2-5 seconds
 agent-browser wait --text "Welcome"   # Wait for text
 agent-browser wait --url "**/dash"    # Wait for URL pattern
 agent-browser wait --load networkidle # Wait for load state
@@ -243,6 +244,7 @@ agent-browser reload                  # Reload page
 --proxy-bypass <hosts>   # Hosts to bypass proxy
 --ignore-https-errors    # Ignore HTTPS certificate errors
 --allow-file-access      # Allow file:// URLs to access local files (Chromium only)
+--stealth                # Stealth mode: local uses launch args+init scripts; CDP/provider uses init scripts
 -p, --provider <name>    # Browser provider (ios, browserbase, kernel, browseruse)
 --device <name>          # iOS device name (e.g., "iPhone 15 Pro")
 --json                   # JSON output (for scripts)
@@ -251,7 +253,7 @@ agent-browser reload                  # Reload page
 --headed                 # Show browser window (not headless)
 --cdp <port|url>         # Connect via Chrome DevTools Protocol (port or WebSocket URL)
 --auto-connect           # Auto-discover and connect to running Chrome
---debug                  # Debug output
+--debug                  # Debug output (includes stealth connection type + capabilities)
 ```
 
 ## Command chaining