Satisfy and declare the datex4j 1.0 readiness gate

[juherr]

Goal

Release 1.0 only after the SDK demonstrates sustained API stability, interoperability, security, and useful domain coverage.

Acceptance criteria

• The public API passes multiple release cycles without unplanned breakage.
• Java 21 and Java 25 builds are blocking.
• Security, dependency isolation, compatibility, and consumer tests are blocking.
• XML covers every advertised version from 2.0 through 2.3 and 3.0 through 3.7.
• Official-feed compatibility and motivated exceptions are public.
• Traffic, parking, SRTI, and AFIR provide useful business APIs.
• AFIR static, dynamic, OCPI, profile validation, and delta flows pass end to end.
• Release automation, signatures, SBOM, changelog, and migration guidance are operational.
• Performance regressions above 15 percent are explained.
• No generated model source has been modified manually.

Dependencies

This is the final convergence issue and depends on the completion or explicit disposition of all earlier milestones.

Planning

• Priority: P1
• Complexity: L