feat(hooks): add comment-checker hook for detecting unnecessary comments

- Port Go comment-checker to TypeScript using web-tree-sitter
- Support 38 programming languages via tree-sitter-wasms
- Filter out valid comments: BDD patterns, lint directives, docstrings, shebangs
- Integrate with OpenCode's tool.execute.before/after hooks
- Attach feedback to Write/Edit/MultiEdit tool output

src/hooks/comment-checker/output/xml-builder.ts

@@ -0,0 +1,24 @@
+import type { FileComments } from "../types"
+
+function escapeXml(text: string): string {
+  return text
+    .replace(/&/g, "&")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&apos;")
+}
+
+export function buildCommentsXml(fileCommentsList: FileComments[]): string {
+  const lines: string[] = []
+
+  for (const fc of fileCommentsList) {
+    lines.push(`<comments file="${escapeXml(fc.filePath)}">`)
+    for (const comment of fc.comments) {
+      lines.push(`\t<comment line-number="${comment.lineNumber}">${escapeXml(comment.text)}</comment>`)
+    }
+    lines.push(`</comments>`)
+  }
+
+  return lines.join("\n")
+}