fix(scripts): fail update-export-versions if snapshot update fails

[pasevin]

Problem

The update-export-versions.cjs script was silently swallowing errors when snapshot updates failed. This caused:

1. versions.ts to be updated to new version (e.g., 0.17.0)
2. Snapshot update to fail (silently caught)
3. versions.ts committed WITHOUT matching snapshots (which still have old version 0.16.0)
4. Coverage tests fail because snapshots don't match actual output

This is why PR #244 (Version Packages) keeps failing - the snapshots have 0.16.0 while versions.ts has 0.17.0.

Solution

The script now exits with code 1 if snapshot update fails, preventing the mismatched state from being committed.

Root Cause Analysis

// BEFORE: Error was caught but not propagated
catch (error) {
  console.error('❌ Failed to update snapshots:', error.message);
  console.log('⚠️  Please run "..." manually');
  // Script continues and exits with code 0!
}

// AFTER: Error causes script to fail
catch (error) {
  console.error('❌ Failed to update snapshots:', error.message);
  console.error('⚠️  Snapshot update failed...');
  process.exit(1);  // Now fails properly
}

Test plan

• Merge this fix
• Rerun the update-versions workflow on changeset-release/main
• Verify it either succeeds with matching snapshots OR fails clearly if there's an issue