Gl/improve code add schema

[GuanyiLi-Craig]

1. improve function docs and test
2. add skills to the category
3. expose category in openapi
4. add output schema for getting tools.

[Copilot]

Pull request overview

This PR enhances the HuMCP server with improved documentation, structured skill metadata, OpenAPI schema integration, and comprehensive testing coverage.

Key Changes:

• Added skill discovery system with SKILL.md files containing frontmatter metadata for each tool category
• Implemented Pydantic response schemas for all API endpoints with typed responses
• Integrated skill metadata and OpenAPI tags into category-based documentation
• Added extensive test coverage with pytest-cov and new test suites for skills, server, routes, and decorator modules
• Enhanced security in filesystem and data processing tools with allowlists and validation

Reviewed changes

Copilot reviewed 44 out of 45 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
uv.lock	Added coverage 7.13.1 and pytest-cov dependencies; updated grafi version
tests/humcp/*	New comprehensive test suites for skills, server, routes, and decorator
tests/conftest.py	Shared fixtures for test isolation and sample tools
tests/tools/*	Formatting improvements for better readability
src/tools/*/SKILL.md	New skill documentation with YAML frontmatter for each category
src/tools/local/local_file_system.py	Added path validation security with HUMCP_ALLOW_ABSOLUTE_PATHS env var
src/tools/data/pandas.py	Added allowlists for safe pandas operations
src/tools/data/csv.py	Added SQL query validation to prevent injection
src/tools/google/*	Migrated from FastMCP to @tool decorator, improved docstrings
src/humcp/skills.py	New module for discovering and parsing SKILL.md files
src/humcp/schemas.py	New Pydantic models for typed API responses
src/humcp/routes.py	Updated to use response models and integrate skill metadata
src/humcp/server.py	Added OpenAPI tags generation from discovered categories
pyproject.toml	Added pytest-cov, coverage configuration, updated grafi
.pre-commit-config.yaml	Added pytest pre-push hook, Python 3.13 version, additional checks
.github/workflows/ci.yaml	Restructured CI with separate lint, type-check, test jobs

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