Pending deliveries no longer start duplicate builds

The deployment reconciler now recognizes deliveries waiting behind GitHub's concurrency queue as live work. An hourly reconciliation can no longer start a second image build for the same commit while the original delivery is pending.

Reconnecting…
The connection to the server was interrupted. Trying to restore it…
Trying again…
The connection could not be restored. Reloading the page…
The server was updated. Reloading the page to pick up the latest version.