fix: Improve renamed package detection

[behalshabnam]

This PR solves #441 by improving the package detection logic.

Package Detection Improvements

The package verification now uses multiple identifiers to establish package identity:

1. Repository URL Matching

   • Primary identifier for package identity
   • Handles cases where package names change but repository remains the same

2. Author Verification

   • Checks for common authors between versions
   • Helps verify package lineage across renames

3. Version Correlation

   • Matches exact versions to ensure continuity
   • Prevents false positives from similarly named packages

4. Description Similarity Analysis

   • Uses text similarity matching for package descriptions
   • Threshold-based comparison (30%) to accommodate minor description updates
   • Helps confirm package identity when other metadata changes

Implementation Details

• Added is_same_package_except_name function for comprehensive package verification
• Introduced SIMILARITY_SCALE (100) and SIMILARITY_THRESHOLD (30) constants for description matching
• Implemented helper functions:
  • have_common_author: Checks author overlap
  • high_similarity: Performs description similarity analysis

Testing

• Added integration test renamed_package_not_flagged to verify behavior
• Test uses the icu-rename fixture to validate package detection
• Confirms that renamed packages are not incorrectly flagged as unmaintained

Example

A package like icu_locid that was previously incorrectly flagged as "not in repository" is now properly recognized when:

• The repository URL matches
• Authors overlap with the original package
• Package descriptions are sufficiently similar

[CLAassistant]

All committers have signed the CLA.

[behalshabnam]

Hello @smoelius,

Here is the PR for #441. Please review and let me know if anything needs to be changed.

Thank You!

[smoelius]

@behalshabnam Thanks very much for working on this. I have a little bit of a PR backlog, but I will try to get to this soon.

[smoelius]

@behalshabnam Sorry I haven't had a chance to review this. I am getting ready to travel, and I will get back early next week. I will make it a priority to review this then.