When a dependency has an invalid version constraint like '>=' (without
a version number), the resolver now treats it as a wildcard and returns
the latest available version instead of failing with 'Dependency not found'.
This handles malformed metadata that may have been stored from PyPI packages.
- Deduplicate dependencies by package name before inserting
- Some packages (like anyio) list the same dep (trio) multiple times with
different version constraints for different extras
- The unique constraint on (artifact_id, project, package) rejected these
- Also removed debug logging from dependencies.py
- Parse version constraints like >=1.9, <2.0 using packaging library
- Find the latest version that satisfies the constraint
- Support wildcard (*) to get latest version
- Fall back to exact version and tag matching
