ContactForm component created

Error message renders on empty submit

Implementation is minimal

Test pass confirmed

Phase gating respected

Private mock rejected

Violation explained

Injected dependency mocked correctly

Observable output asserted

Phase gating respected

User request acknowledged

Constraint explained

Phase 1 presented and gated

Public interface targeted

Behavioral outcome asserted

xUnit test targets public interface

Assertion checks false for short password

No implementation code written

Public interface only

Expected failure reason stated

Phase gating respected

Formula replaces hard-coded values

Code is more idiomatic

Behavioral test still passes

Public signature unchanged

Change summary provided