feature/GH-30-full-offline-protocol-wiremock-matrix
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Closes #30. Implements comprehensive integration_matrix test combining EventBus, DatabaseEngine, FTS5, MockMailBackend, MockCalendarBackend, SecretManager, PayloadCipher, and HeadlessRunner.
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Closes #30. Implements comprehensive integration_matrix test combining EventBus, DatabaseEngine, FTS5, MockMailBackend, MockCalendarBackend, SecretManager, PayloadCipher, and HeadlessRunner.