First stable DevElation release following the Ref primitive alpha series.\n\nHighlights:\n- Promotes the Ref primitive lifecycle work from v1.3.38-alpha into the stable line.\n- Removes stale TODO/FIXME-style production comments from src/.\n- Fixes Authenticator login-attempt cleanup to use the injected datasource rather than an undefined variable.\n- Clarifies Application request defaults and mapped-service parent attachment through small helper methods.\n- Documents the Services\Client base extension contract.\n- Refreshes Composer package metadata, test scripts, and archive excludes for distribution readiness.\n\nValidation:\n- PR CI passed on PHP 8.2 and PHP 8.3.\n- composer validate --strict passed.\n- git diff --check passed.\n- Production placeholder inventory is clean for src/.\n- Local PHPUnit was validated in grouped suite chunks because the monolithic run timed out in the local Windows harness before summary output.