feat: add bugfix workflow, test-engineer agent, and debugging skills

- Add test-engineer agent for bug reproduction and verification
- Add /qc:bugfix command for structured bugfix workflow
- Add e2e-testing skill covering headless/interactive modes, MCP testing
- Add structured-debugging skill for hypothesis-driven debugging
- Simplify AGENTS.md to focus on essential commands and conventions
- Add terminal-capture scenario for bugfix workflow testing
- Add .qwen folder to ESLint ignore list

Known limitations: The /qc:bugfix workflow and e2e-testing skill
are experimental and may be unstable or consume significant tokens.

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

.qwen/skills/e2e-testing/scripts/mcp-test-server.js

@@ -0,0 +1,114 @@
+#!/usr/bin/env node
+/**
+ * Zero-dependency MCP test server template.
+ * Speaks JSON-RPC over stdin/stdout — no npm install needed.
+ *
+ * Usage:
+ *   1. Edit TOOL_DEFINITIONS to define your tools
+ *   2. Edit handleToolCall() to implement tool behavior
+ *   3. Configure in .qwen/settings.json and run via the CLI
+ *
+ * Sanity check without the CLI:
+ *   printf '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}\n' | node mcp-test-server.js
+ */
+
+const readline = require('readline');
+const rl = readline.createInterface({ input: process.stdin, terminal: false });
+
+// ---------------------------------------------------------------------------
+// Configure your tools here
+// ---------------------------------------------------------------------------
+
+const SERVER_NAME = 'test-server';
+const SERVER_VERSION = '1.0.0';
+
+const TOOL_DEFINITIONS = [
+  {
+    name: 'echo',
+    description: 'Echoes back the provided arguments as JSON.',
+    inputSchema: {
+      type: 'object',
+      properties: {
+        message: { type: 'string', description: 'Message to echo' },
+      },
+      required: ['message'],
+    },
+  },
+  // Add more tools here
+];
+
+function handleToolCall(name, args) {
+  switch (name) {
+    case 'echo':
+      return `Echo: ${JSON.stringify(args)}`;
+    // Add more cases here
+    default:
+      return null; // returning null signals unknown tool
+  }
+}
+
+// ---------------------------------------------------------------------------
+// MCP protocol handling — no need to edit below this line
+// ---------------------------------------------------------------------------
+
+function send(msg) {
+  process.stdout.write(JSON.stringify(msg) + '\n');
+}
+
+rl.on('line', (line) => {
+  let req;
+  try {
+    req = JSON.parse(line.trim());
+  } catch {
+    return;
+  }
+
+  if (req.method === 'initialize') {
+    send({
+      jsonrpc: '2.0',
+      id: req.id,
+      result: {
+        protocolVersion: '2024-11-05',
+        capabilities: { tools: {} },
+        serverInfo: { name: SERVER_NAME, version: SERVER_VERSION },
+      },
+    });
+  } else if (req.method === 'notifications/initialized') {
+    // no response needed
+  } else if (req.method === 'tools/list') {
+    send({
+      jsonrpc: '2.0',
+      id: req.id,
+      result: { tools: TOOL_DEFINITIONS },
+    });
+  } else if (req.method === 'tools/call') {
+    const toolName = req.params?.name;
+    const args = req.params?.arguments || {};
+    const result = handleToolCall(toolName, args);
+
+    if (result === null) {
+      send({
+        jsonrpc: '2.0',
+        id: req.id,
+        result: {
+          content: [{ type: 'text', text: `Unknown tool: ${toolName}` }],
+          isError: true,
+        },
+      });
+    } else {
+      send({
+        jsonrpc: '2.0',
+        id: req.id,
+        result: {
+          content: [{ type: 'text', text: String(result) }],
+        },
+      });
+    }
+  } else if (req.id) {
+    send({
+      jsonrpc: '2.0',
+      id: req.id,
+      error: { code: -32601, message: 'Method not found' },
+    });
+  }
+});