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>

src/skill_seekers/mcp/__init__.py

@@ -28,6 +28,6 @@ Usage:
     in ~/.config/claude-code/mcp.json
 """
 
-__version__ = "2.4.0"
+__version__ = "2.5.1"
 
 __all__ = ["agent_detector"]