v2.5.1

What's Fixed

• package_skill.py: .skill output now saved inside the skill's own folder by default (e.g. my-skill/my-skill.skill) instead of the current working directory
• package_skill.py: Added *.skill exclusion filter — prevents self-inclusion when re-packaging a skill that already has a .skill file inside it
• package_skill.py: Success message now shows the absolute path and a usage hint for claude.ai
• package_skill.py: Removed unreachable is_project_directory() function (dead code cleanup)