feat: demo-pmd 样本工程入库 + Windows spawn cmd EINVAL 修复 + 实测报告清理

- data/demo-pmd 全量入库（26 源文件 + pom/mvnw/lib/reports），.gitignore 排除 target/
- 归档 demo-pmd 实测覆盖率报告（279/279 全覆盖）至 reports/
- 删除 4 份覆盖率报告中的后续建议/实测进度总览（全部实测已收官）
- 修复 Windows spawn .cmd/.bat EINVAL（auxClasspath.ts 经 cmd.exe /d /s /c 间接执行）

src/services/auxClasspath.ts

@@ -157,6 +157,13 @@ export class AuxClasspathResolver {
     return systemName;
   }
 
+  private quoteCmdArg(arg: string): string {
+    if (/^[\w.,:=/@%\\+-]+$/.test(arg)) {
+      return arg;
+    }
+    return `"${arg.replace(/"/g, '""')}"`;
+  }
+
   private lastNonEmptyLine(output: string): string {
     const lines = output.split(/\r?\n/).map((line) => line.trim()).filter((line) => line.length > 0);
     return lines.length > 0 ? lines[lines.length - 1] : '';
@@ -174,7 +181,16 @@ export class AuxClasspathResolver {
         reject(new Error(`Command timed out after ${BUILD_TIMEOUT}ms: ${cmd}`));
       }, BUILD_TIMEOUT);
       try {
-        proc = spawn(cmd, args, { cwd, windowsHide: true });
+        if (isWindows() && /\.(cmd|bat)$/i.test(cmd)) {
+          const inner = `${this.quoteCmdArg(cmd)} ${args.map((arg) => this.quoteCmdArg(arg)).join(' ')}`;
+          proc = spawn('cmd.exe', ['/d', '/s', '/c', `"${inner}"`], {
+            cwd,
+            windowsHide: true,
+            windowsVerbatimArguments: true,
+          });
+        } else {
+          proc = spawn(cmd, args, { cwd, windowsHide: true });
+        }
       } catch (err) {
         clearTimeout(timer);
         reject(err);