Implement representative SRTI and RTTI conformance profiles

[juherr]

Goal

Validate the most representative official SRTI and RTTI interoperability constraints.

Scope

• Select and document the initial recommended reference profiles.
• Implement required-field, cardinality, reference, and semantic rules.
• Use stable diagnostic codes and business paths.
• Add official positive fixtures and synthetic negative fixtures.
• Document deviations or profile ambiguities.

Acceptance criteria

• At least one representative SRTI profile is implemented.
• At least one representative RTTI profile is implemented.
• Positive official examples pass.
• Every implemented rule has a focused negative test.
• Profile identity and supported revision are publicly documented.

Dependencies

Depends on the conformance-profile API and relevant domain builders.

Planning

• Priority: P1
• Complexity: XL