[Duvet05]

When an AMPATH JSON schema declares a new form (or new version) with retired: true, createNewForm saves it without a retirement reason. OpenMRS validation rejects it with retireReason: general.retiredReason.empty; strict Initializer startup aborts.

Reuse the same default retirement reason already applied when retiring an existing form. Integration tests cover a new retired form and a retired version replacing an active form, including preservation of the previous schema resource. No changes to form identity, schema content, publication flags or validation rules.

Validation (synthetic data, no Docker):

• Both added integration tests failed before the fix; all five AMPATH loader tests pass after it.
• Full Maven reactor on Java 11: 254 tests, zero failures/errors/skips; build successful.
• Core 2.8 module on Java 21: 14 tests passed; build successful.
• git diff --check passed. Excluded unrelated formatter output generated by the inherited build plugin.

Downstream integration: sihsalus/sihsalus#336. The downstream content uses declarative retirement; this fixes the owning loader instead of adding SQL or a second loader. Downstream maintainer: @Duvet05; replace the temporary fork pin with an upstream release containing this fix after equivalent validation.