cherry-pick(main): hex compare filter + sitemap pairs (from #764)

src/app/compare/[slug]/page.tsx

@@ -84,9 +84,16 @@ function parseAdHocSlug(slug: string): { a: string; b: string } | null {
  * Returns a synthetic ComparePair so the rest of the route works
  * unchanged. Returns null when any of those checks fail.
  */
+// HL builder addresses (0x...) leak into the provider catalog because
+// the HL bench tracks builders by raw on-chain address. They have no
+// search demand as compare targets, only pollute crawl budget.
+// Drop them at the entry so /compare/0x...-vs-* 404s cleanly.
+const HEX_SLUG_RE = /^0x[0-9a-f]{4,}$/i;
+
 async function resolveAdHocPair(slug: string): Promise<ComparePair | null> {
  const parsed = parseAdHocSlug(slug);
  if (!parsed) return null;
+ if (HEX_SLUG_RE.test(parsed.a) || HEX_SLUG_RE.test(parsed.b)) return null;
  const [first, second] = [parsed.a, parsed.b].sort();
  if (slug !== `${first}-vs-${second}`) return null;
  const [a, b] = await Promise.all([

src/app/sitemap.ts

@@ -2,6 +2,7 @@ import { statSync } from "node:fs";
 import path from "node:path";
 import type { MetadataRoute } from "next";
 import { getBenchmarks } from "@/data/benchmarks";
+import { COMPARE_PAIRS } from "@/data/compare-pairs";
 import { loadAllAlternatives } from "@/lib/alternatives";
 import { loadAllAnswers } from "@/lib/answers";
 import { CHAIN_BY_SLUG, CHAINS, getBenchmarksForChain } from "@/lib/chains";
@@ -286,13 +287,36 @@ async function buildFullSitemap(): Promise<MetadataRoute.Sitemap> {
  )
  ).filter((r): r is NonNullable<typeof r> => r !== null);
 
+ // Curated compare pairs. Both providers are pre-validated to exist
+ // and share at least one bench (criteria documented in
+ // src/data/compare-pairs.ts). Defensive recheck via getProvider to
+ // skip any pair whose provider was removed since publication.
+ const compareRoutes: MetadataRoute.Sitemap = (
+ await Promise.all(
+ COMPARE_PAIRS.map(async (pair) => {
+ const [a, b] = await Promise.all([
+ getProvider(pair.providerA),
+ getProvider(pair.providerB),
+ ]);
+ if (!a || !b) return null;
+ return {
+ url: `${SITE.url}/compare/${pair.slug}`,
+ lastModified: catalogTs,
+ changeFrequency: "weekly" as const,
+ priority: 0.7,
+ };
+ }),
+ )
+ ).filter((r): r is NonNullable<typeof r> => r !== null);
+
  return [
  ...staticRoutes,
  ...benchmarkRoutes,
  ...providerRoutes,
  ...alternativeRoutes,
  ...answerRoutes,
  ...chainRoutes,
+ ...compareRoutes,
  ];
 }