chore: Bump version to v2.5.1 - Critical PyPI Bug Fix

Version Updates:
- pyproject.toml: 2.5.0 → 2.5.1
- src/skill_seekers/__init__.py: 2.0.0 → 2.5.1
- src/skill_seekers/cli/__init__.py: 2.0.0 → 2.5.1
- src/skill_seekers/cli/main.py: 2.4.0 → 2.5.1
- src/skill_seekers/mcp/__init__.py: 2.4.0 → 2.5.1
- src/skill_seekers/mcp/tools/__init__.py: 2.4.0 → 2.5.1

CHANGELOG:
- Added v2.5.1 release notes documenting PR #221 fix
- Critical: Fixed missing skill_seekers.cli.adaptors package
- Impact: Restores all multi-platform features for PyPI users

Documentation:
- Updated CLAUDE.md to v2.5.0 with multi-platform details
- Added platform adaptor architecture documentation
- Updated test architecture and environment variables

Related: PR #221 (merged), Issue #222 (py.typed follow-up)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "skill-seekers"
-version = "2.5.0"
+version = "2.5.1"
 description = "Convert documentation websites, GitHub repositories, and PDFs into Claude AI skills"
 readme = "README.md"
 requires-python = ">=3.10"