Show commit builds and mandate automatic node updates

Hop-State: A_06FP97T67MMQBS4JYJVZ710
Hop-Proposal: R_06FP97R88JYXTBZTNVXV08G
Hop-Task: T_06FP95PNKD7PXAMPWPRWSD8
Hop-Attempt: AT_06FP95PNKE2R52XYNMKVRWG

next.config.ts

@@ -1,6 +1,25 @@
 import type { NextConfig } from "next";
+import { execFileSync } from "node:child_process";
+
+function getBuildCommit(): string {
+  if (process.env.APP_COMMIT) return process.env.APP_COMMIT;
+
+  try {
+    return execFileSync('git', ['rev-parse', 'HEAD'], {
+      cwd: process.cwd(),
+      encoding: 'utf8',
+    }).trim();
+  } catch {
+    return 'unknown';
+  }
+}
 
 const nextConfig: NextConfig = {
+  env: {
+    APP_COMMIT: getBuildCommit(),
+    APP_BUILD_DATE: process.env.APP_BUILD_DATE || new Date().toISOString(),
+  },
+
   // Turso ships a platform-native Node module and must remain a runtime dependency.
   serverExternalPackages: ['@tursodatabase/database'],