the build needs a working directory, and its absence was silent

`bun run build:site` resolves the script from the package.json in the current
directory. The helper had no cwd parameter, so it ran in the platform's own
directory, which has no such script — and the error, "Script not found
build:site", reads as the site missing a script rather than as it being asked in
the wrong place.

Second time today a spawn helper quietly lacked something the caller needed: the
first was the environment for pm2. Both had the same shape — assembled correctly
and then not passed.

Verified by running the real build with the same environment the plugin builds:
29 entries in dist and an index.html with the site in it.

api/static-site.ts

@@ -65,12 +65,24 @@ const readRow = async () => (await db.select().from(fofosAdminSettings).limit(1)
 
 export const distPath = (root: string): string => join(root, 'website', 'dist');
 
-const run = async (argv: string[], timeoutMs = 60_000, env?: Record<string, string>) => {
+const run = async (
+  argv: string[],
+  timeoutMs = 60_000,
+  options: { env?: Record<string, string>; cwd?: string } = {},
+) => {
+  /*
+    `cwd` matters and its absence was silent.
+
+    `bun run build:site` resolves the script from the package.json in the CURRENT directory. Without a
+    cwd it ran in the platform's own, which has no such script, and the error — "Script not found" —
+    reads like the site is missing one rather than like it was asked in the wrong place.
+  */
   const proc = Bun.spawn(argv, {
     stdout: 'pipe',
     stderr: 'pipe',
     stdin: 'ignore',
-    ...(env ? { env: { ...process.env, ...env } } : {}),
+    ...(options.cwd ? { cwd: options.cwd } : {}),
+    ...(options.env ? { env: { ...process.env, ...options.env } } : {}),
   });
   const timer = setTimeout(() => proc.kill(), timeoutMs);
   try {
@@ -137,10 +149,9 @@ export async function buildSite(secrets: {
   const url = new URL(raw);
   url.pathname = `/${databases.production.name}`;
 
-  const result = await run(
-    ['bun', 'run', 'build:site'],
-    15 * 60 * 1000,
-    {
+  const result = await run(['bun', 'run', 'build:site'], 15 * 60 * 1000, {
+    cwd: websiteDir,
+    env: {
       NODE_ENV: 'production',
       FOFOS_ENV: 'production',
       POSTGRES_URL: url.toString(),
@@ -154,7 +165,7 @@ export async function buildSite(secrets: {
       PUBLIC_URL: process.env.FOFOS_PUBLIC_URL ?? 'http://127.0.0.1',
       API_URL: process.env.FOFOS_PUBLIC_URL ?? 'http://127.0.0.1',
     },
-  );
+  });
 
   return { ok: result.ok, output: `$ bun run build:site  (FOFOS_ENV=production)\n${result.output}` };
 }