Display repository commit count as the Synapsis version

Hop-State: A_06FP98T1AFPC938R80XJ3J0
Hop-Proposal: R_06FP98S721MFZV1BVBVDTK8
Hop-Task: T_06FP98D0VF530A9XJ2HHHWR
Hop-Attempt: AT_06FP98D0VFKNWCN4EJD46YR

next.config.ts

@@ -14,9 +14,23 @@ function getBuildCommit(): string {
   }
 }
 
+function getBuildCommitCount(): string {
+  if (process.env.APP_COMMIT_COUNT) return process.env.APP_COMMIT_COUNT;
+
+  try {
+    return execFileSync('git', ['rev-list', '--count', 'HEAD'], {
+      cwd: process.cwd(),
+      encoding: 'utf8',
+    }).trim();
+  } catch {
+    return 'unknown';
+  }
+}
+
 const nextConfig: NextConfig = {
   env: {
     APP_COMMIT: getBuildCommit(),
+    APP_COMMIT_COUNT: getBuildCommitCount(),
     APP_BUILD_DATE: process.env.APP_BUILD_DATE || new Date().toISOString(),
   },