feat(baoyu-danger-x-to-markdown): add referenced tweet rendering, media reuse, and hi-res downloads

- Render embedded tweets in articles as blockquotes with author info and text summary
- Reuse existing markdown when --download-media targets already-converted URLs
- Upgrade Twitter image downloads to 4096x4096 resolution
- Improve entity resolution with logical key lookup
- Support trailing media for all block types (headings, lists, blockquotes)
- Change output path to {username}/{tweet-id}/{content-slug}.md for stable paths

skills/baoyu-danger-x-to-markdown/scripts/media-localizer.ts

@@ -187,11 +187,35 @@ function buildFileName(kind: MediaKind, index: number, sourceUrl: string, extens
 
 const FRONTMATTER_COVER_RE = /^(coverImage:\s*")(https?:\/\/[^"]+)(")/m;
 
+function toHighResUrl(rawUrl: string): string {
+  try {
+    const parsed = new URL(rawUrl);
+    if (parsed.hostname !== "pbs.twimg.com") return rawUrl;
+    const ext = path.posix.extname(parsed.pathname).replace(/^\./, "").toLowerCase();
+    if (!ext || !IMAGE_EXTENSIONS.has(ext)) return rawUrl;
+    parsed.pathname = parsed.pathname.replace(new RegExp(`\\.${ext}$`), "");
+    parsed.searchParams.set("format", ext === "jpeg" ? "jpg" : ext);
+    parsed.searchParams.set("name", "4096x4096");
+    return parsed.toString();
+  } catch {
+    return rawUrl;
+  }
+}
+
 function collectMarkdownLinkCandidates(markdown: string): MarkdownLinkCandidate[] {
-  MARKDOWN_LINK_RE.lastIndex = 0;
   const candidates: MarkdownLinkCandidate[] = [];
   const seen = new Set<string>();
 
+  const fmMatch = markdown.match(/^---\n([\s\S]*?)\n---/);
+  if (fmMatch) {
+    const coverMatch = fmMatch[1]?.match(FRONTMATTER_COVER_RE);
+    if (coverMatch?.[2] && !seen.has(coverMatch[2])) {
+      seen.add(coverMatch[2]);
+      candidates.push({ url: coverMatch[2], hint: "image" });
+    }
+  }
+
+  MARKDOWN_LINK_RE.lastIndex = 0;
   let match: RegExpExecArray | null;
   while ((match = MARKDOWN_LINK_RE.exec(markdown))) {
     const label = match[1] ?? "";
@@ -204,15 +228,6 @@ function collectMarkdownLinkCandidates(markdown: string): MarkdownLinkCandidate[
     });
   }
 
-  const fmMatch = markdown.match(/^---\n([\s\S]*?)\n---/);
-  if (fmMatch) {
-    const coverMatch = fmMatch[1]?.match(FRONTMATTER_COVER_RE);
-    if (coverMatch?.[2] && !seen.has(coverMatch[2])) {
-      seen.add(coverMatch[2]);
-      candidates.push({ url: coverMatch[2], hint: "image" });
-    }
-  }
-
   return candidates;
 }
 
@@ -259,7 +274,8 @@ export async function localizeMarkdownMedia(
 
   for (const candidate of candidates) {
     try {
-      const response = await fetch(candidate.url, {
+      const downloadUrl = toHighResUrl(candidate.url);
+      const response = await fetch(downloadUrl, {
         method: "GET",
         redirect: "follow",
         headers: {