fix(db): grant app user permissions on players and games tables

PostgreSQL 15+ revokes CREATE from non-superusers in public schema by default.
Child 1's migration created the tables as postgres superuser, leaving the
txt_game_scores app user with no privileges — causing "permission denied"
on every request in production.

Adds a numbered provision migration to GRANT SELECT/INSERT/UPDATE on players
and games, plus USAGE/SELECT on games_id_seq, to the app user.

Task: d1c49d59-57bd-4eba-9e22-f25a04157ad4

migrations/provision/postgres/001-grant-permissions.ts

@@ -0,0 +1,29 @@
+import pg from "pg";
+
+const client = new pg.Client({
+  host: process.env.PROVISION_HOST,
+  port: parseInt(process.env.PROVISION_PORT ?? "5432"),
+  user: process.env.PROVISION_USER,
+  password: process.env.PROVISION_PASSWORD,
+  database: process.env.PROVISION_DATABASE,
+});
+
+await client.connect();
+
+try {
+  // The HAL postgres provisioner names the app user identically to the database.
+  // PROVISION_DATABASE = "txt_game_scores" = the app user that server.mjs connects as.
+  const appUser = process.env.PROVISION_DATABASE as string;
+
+  await client.query(
+    `GRANT SELECT, INSERT, UPDATE ON TABLE players, games TO "${appUser}"`
+  );
+
+  await client.query(
+    `GRANT USAGE, SELECT ON SEQUENCE games_id_seq TO "${appUser}"`
+  );
+
+  console.log(`[txt-game migration-001] permissions granted to ${appUser}`);
+} finally {
+  await client.end();
+}