Forward ash.codegen and ecto.migration through the Aether plugin wrapper and update agent guidance to prefer AshPostgres codegen for resource-backed schema changes.
Extend the local plugin helper to forward the new validate command through the host environment and document the validate/test/precommit workflow in the plugin README.
Switch Aether to the stricter plugin-facing auth and community contract.
Replace local structural coverage with host-backed contract and page tests.
Add plugin helper wrappers and shared test config for the host devenv flow.
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