chore(deps): @profullstack/x402-gateway ^0.15.2, old browsers get the script challenge (#346)

A desktop Chrome two years behind was answered 402 on every content page;
0.15.2 gives it the script challenge first, so a person on an old office
machine reads.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: ralyodio

bun.lock

@@ -66,7 +66,7 @@
     "@profullstack/pairux-embed": "^0.1.0",
     "@profullstack/stack": "^0.5.0",
     "@profullstack/text-type-detection": "^1.0.0",
-    "@profullstack/x402-gateway": "^0.15.1",
+    "@profullstack/x402-gateway": "^0.15.2",
     "@simplewebauthn/browser": "^14.0.0",
     "@simplewebauthn/server": "^14.0.3",
     "@supabase/ssr": "^0.12.7",