[Bug]: SkillLoader relative paths break when package is installed via pip

[rosspeili]

Affected Component

Core Framework (Loader/Env)

Skill Name (if applicable)

n/a

Bug Description

When skillware is installed into a virtual environment's site-packages via pip, the relative path calculation in loader.py fails to locate a user's local skills/ directory if they are working in a completely separate project. It instead looks for the skills folder inside the site-packages/skillware/... path.

We need it to respect os.getcwd() or read from an environment variable (e.g., SKILLWARE_SKILL_PATH) before falling back.

Steps to Reproduce

1. pip install skillware
2. Create a local skills/ folder containing a valid skill in a completely new directory.
3. Write a script in that directory attempting to load the skill using a relative path: SkillLoader.load_skill("my_local_skill").
4. Observe a FileNotFoundError as the loader attempts to look inside the site-packages/skillware directory instead of your local project.

Error Logs

FileNotFoundError: Skill not found at /path/to/venv/lib/site-packages/skillware/core/../../skills/my_local_skill

Environment

• OS: Any OS
• Python Version: 3.11+
• Skillware Version: Current main branch