[ZhuchkaTriplesix]

Closes #1635, closes #1636.

• engineRangeAllows glues an operator (>=, <=, >, <, =, ^) to the version that follows it before splitting, so >= 0.4.0 < 3.0.0 reads like >=0.4.0 <3.0.0. A bare operator is still an unsupported range (null).
• HostVersion implements operator >; _comparatorAllows uses > and <= directly instead of negated comparisons.
• Tests for both.

[ZhuchkaTriplesix]

🔍 Post-Merge Code Review & Verification

Clean enhancement for extension compatibility handling:

1. Range Operator Gluer (marketplace_download_policy.dart):

   • Permitting spaces after range operators (e.g. >= 0.4.0 < 3.0.0) conforms to standard semantic versioning specs in extension manifests.

2. HostVersion Ordering:

   • Native implementation of operator > simplifies comparator logic and avoids error-prone inverted <= / < conditions.