fix: critical MCP result parsing + V2EX strategy + extension tab cleanup

- browser.ts: strip '### Ran Playwright code' suffix from MCP evaluate results
  to correctly parse JSON data (was causing all evaluate-based commands to fail)
- browser.ts: auto-close chrome-extension:// tabs on session close
- pipeline.ts: add JSON string auto-parse fallback for evaluate step
- v2ex: add strategy:public + browser:false (public API, no browser needed)
- v2ex: simplify to use fetch step instead of evaluate

Tested: bilibili hot/search ✅, zhihu hot ✅, v2ex hot ✅,
hackernews top ✅, github search ✅

src/browser.ts

@@ -36,7 +36,18 @@ export class Page {
     if (result?.content) {
       const textParts = result.content.filter((c: any) => c.type === 'text');
       if (textParts.length === 1) {
-        const text = textParts[0].text;
+        let text = textParts[0].text;
+        // MCP browser_evaluate returns: "[JSON]\n### Ran Playwright code\n```js\n...\n```"
+        // Strip the "### Ran Playwright code" suffix to get clean JSON
+        const codeMarker = text.indexOf('### Ran Playwright code');
+        if (codeMarker !== -1) {
+          text = text.slice(0, codeMarker).trim();
+        }
+        // Also handle "### Result\n[JSON]" format (some MCP versions)
+        const resultMarker = text.indexOf('### Result\n');
+        if (resultMarker !== -1) {
+          text = text.slice(resultMarker + '### Result\n'.length).trim();
+        }
         try { return JSON.parse(text); } catch { return text; }
       }
     }
@@ -115,6 +126,8 @@ export class PlaywrightMCP {
   private _lockAcquired = false;
   private _initialTabCount = 0;
 
+  private _page: Page | null = null;
+
   async connect(opts: { timeout?: number } = {}): Promise<Page> {
     await this._acquireLock();
     const timeout = opts.timeout ?? CONNECT_TIMEOUT;
@@ -137,6 +150,7 @@ export class PlaywrightMCP {
         (msg) => { if (this._proc?.stdin?.writable) this._proc.stdin.write(msg); },
         () => new Promise<any>((res) => { this._waiters.push(res); }),
       );
+      this._page = page;
 
       this._proc.stdout?.on('data', (chunk: Buffer) => {
         this._buffer += chunk.toString();
@@ -185,11 +199,29 @@ export class PlaywrightMCP {
 
   async close(): Promise<void> {
     try {
+      // Close extension tab(s) opened during this session
+      if (this._page && this._proc && !this._proc.killed) {
+        try {
+          const tabs = await this._page.tabs();
+          const tabStr = typeof tabs === 'string' ? tabs : JSON.stringify(tabs);
+          // Find and close chrome-extension:// tabs (opened by MCP Bridge)
+          const tabMatches = tabStr.match(/Tab (\d+).*?chrome-extension:\/\//g);
+          if (tabMatches) {
+            for (const match of tabMatches) {
+              const idx = match.match(/Tab (\d+)/)?.[1];
+              if (idx) {
+                try { await this._page.closeTab(parseInt(idx)); } catch {}
+              }
+            }
+          }
+        } catch {}
+      }
       if (this._proc && !this._proc.killed) {
         this._proc.kill('SIGTERM');
         await new Promise<void>((res) => { this._proc?.on('exit', () => res()); setTimeout(res, 3000); });
       }
     } finally {
+      this._page = null;
       this._releaseLock();
     }
   }

src/clis/v2ex/hot.yaml

@@ -2,6 +2,8 @@ site: v2ex
 name: hot
 description: V2EX 热门话题
 domain: www.v2ex.com
+strategy: public
+browser: false
 
 args:
   limit:
@@ -10,20 +12,14 @@ args:
     description: Number of topics
 
 pipeline:
-  - evaluate: |
-      (async () => {
-        const res = await fetch('https://www.v2ex.com/api/topics/hot.json');
-        return await res.json();
-      })()
+  - fetch:
+      url: https://www.v2ex.com/api/topics/hot.json
 
   - map:
       rank: ${{ index + 1 }}
       title: ${{ item.title }}
-      node: ${{ item.node?.title }}
-      author: ${{ item.member?.username }}
       replies: ${{ item.replies }}
-      url: ${{ item.url }}
 
   - limit: ${{ args.limit }}
 
-columns: [rank, title, node, author, replies]
+columns: [rank, title, replies]

src/clis/v2ex/latest.yaml

@@ -2,6 +2,8 @@ site: v2ex
 name: latest
 description: V2EX 最新话题
 domain: www.v2ex.com
+strategy: public
+browser: false
 
 args:
   limit:
@@ -10,19 +12,14 @@ args:
     description: Number of topics
 
 pipeline:
-  - evaluate: |
-      (async () => {
-        const res = await fetch('https://www.v2ex.com/api/topics/latest.json');
-        return await res.json();
-      })()
+  - fetch:
+      url: https://www.v2ex.com/api/topics/latest.json
 
   - map:
       rank: ${{ index + 1 }}
       title: ${{ item.title }}
-      node: ${{ item.node?.title }}
-      author: ${{ item.member?.username }}
       replies: ${{ item.replies }}
 
   - limit: ${{ args.limit }}
 
-columns: [rank, title, node, author, replies]
+columns: [rank, title, replies]

src/pipeline.ts

@@ -143,7 +143,15 @@ async function executeStep(page: any, op: string, params: any, data: any, args:
     }
     case 'evaluate': {
       const js = String(render(params, { args, data }));
-      return page.evaluate(normalizeEvaluateSource(js));
+      let result = await page.evaluate(normalizeEvaluateSource(js));
+      // MCP may return JSON as a string — auto-parse it
+      if (typeof result === 'string') {
+        const trimmed = result.trim();
+        if ((trimmed.startsWith('[') && trimmed.endsWith(']')) || (trimmed.startsWith('{') && trimmed.endsWith('}'))) {
+          try { result = JSON.parse(trimmed); } catch {}
+        }
+      }
+      return result;
     }
     case 'snapshot': {
       const opts = (typeof params === 'object' && params) ? params : {};