Transformer that registers AshDispatch.Notifier and persists per-action counter-broadcast config for resources using the counters DSL block.

Pattern (post-tx-semantics retrofit)

Pre-retrofit, this transformer injected change AshDispatch.Changes.BroadcastCounterUpdate per action. The change fired via Ash.Changeset.after_action/2 synchronously inside the action's transaction BEFORE commit/rollback, allowing phantom counter increments to broadcast for rolled-back rows. Post-retrofit, counter logic runs from AshDispatch.Notifier's post-commit notification path (or is dropped on error). See AshDispatch.Notifier moduledoc for the architectural rationale.

Persisted state

• :ash_dispatch_counter_broadcasts — NEW; %{action_name => [counter_config_keyword_list, ...]} for the notifier to consume per-action.
• :simple_notifiers — adds AshDispatch.Notifier (idempotent if InjectDispatchChanges already registered it).