build: account explicitly for the MapLibre 6 worker cost

scripts/check-frontend-budget.mjs

@@ -1,9 +1,14 @@
 import { gzipSync } from "node:zlib";
 import { readdir, readFile } from "node:fs/promises";
-import { join } from "node:path";
+import { basename, join } from "node:path";
 
 const root = process.argv[2] ?? "web/dist";
-const limit = Number(process.env.CARTOLITE_GZIP_BUDGET ?? 350 * 1024);
+// MapLibre 6 requires a separate Vite worker (129,701 gzip bytes in Actions).
+// Keep the previous cap for all other JS/CSS; account for the worker explicitly.
+// Combined measured cost: 446,084 bytes. Runtime timing/route gates are unchanged.
+const uiLimit = 350 * 1024;
+const workerLimit = 128 * 1024;
+const limit = Number(process.env.CARTOLITE_GZIP_BUDGET ?? (uiLimit + workerLimit));
 
 async function assets(dir, pattern) {
   const found = [];
@@ -15,15 +20,25 @@ async function assets(dir, pattern) {
   return found;
 }
 
-const files = await assets(root, /\.(?:css|js)$/);
+const files = await assets(root, /\.(?:css|m?js)$/);
 if (files.length === 0) throw new Error(`no JavaScript or CSS assets found in ${root}`);
 
 let total = 0;
+let workerBytes = 0;
+let workerCount = 0;
 for (const file of files) {
   const bytes = gzipSync(await readFile(file), { level: 9 }).byteLength;
   total += bytes;
+  if (/^maplibre-gl-worker-.*\.m?js$/.test(basename(file))) {
+    workerBytes += bytes;
+    workerCount += 1;
+  }
   console.log(`${bytes.toString().padStart(8)}  ${file}`);
 }
 
 console.log(`${total} gzip bytes total (budget ${limit})`);
-if (total > limit) process.exitCode = 1;
+console.log(`${total - workerBytes} gzip bytes excluding map worker (budget ${uiLimit})`);
+console.log(`${workerBytes} gzip bytes for map worker (budget ${workerLimit})`);
+if (workerCount !== 1) throw new Error(`expected one map worker, found ${workerCount}`);
+if (!Number.isFinite(limit) || limit <= 0) throw new Error('invalid total frontend budget');
+if (total > limit || total - workerBytes > uiLimit || workerBytes > workerLimit) process.exitCode = 1;