Remove temporary latest->v4.0 pin in getModelVersion once v5.0 is supported

[ehennestad]

Summary

openminds.getModelVersion currently rewrites latest to v4.0 as a temporary workaround because v5.0 is not supported yet.

Source: code/internal/+openminds/getModelVersion.m

% Todo: remove. Pin latest version to v4.0 as v5.0 is not supported yet.
if versionNum == "latest"
    versionNum = openminds.internal.utility.VersionNumber("4.0");
    versionNum.Format = "vX.Y";
end

Problem

The current behavior is a hidden override of latest, which can diverge from user expectations and from actual available model versions.

Proposed change

• Remove the temporary latest -> v4.0 rewrite once v5.0 support is implemented.
• Ensure latest resolves to the true latest supported version.
• Add/update tests to cover latest resolution behavior.

Acceptance criteria

• The TODO block above is removed.
• openminds.version() / openminds.getModelVersion() return the correct latest supported version without hardcoded fallback to v4.0.
• Regression tests verify behavior for both explicit version selection and latest.

Notes

If v5.0 support is still pending, consider tracking this issue as blocked-by that support work and referencing the relevant milestone/PR.

[ehennestad]

Added in commit bfd797f: updated tools/tests/+ommtest/+internal/MetaTypeTest.m to temporarily comment out the assertion while latest is pinned to v4.0 until v5.0 support is in place.