feat: implement oss-dev doctor command with full diagnostics

[geetanunakani]

Summary

Implemented oss-dev doctor command with full system diagnostics

Related Issue

Fixes #36

Type of Change

• Bug fix
• New feature
• Documentation
• Refactoring
• Test changes
• CI/Chore

Testing

• uv run ruff check passes
• uv run mypy passes
• uv run pytest passes
• Manual testing done

Description

Fixes #36

Changes Made

• Implemented oss-dev doctor command with full system diagnostics
• Checks Python version (3.10+)
• Checks git CLI installation
• Checks gh CLI installation and authentication
• Checks config file existence
• Checks GEMINI_API_KEY and GITHUB_TOKEN environment variables
• Reports results with pass/warn/fail status using Rich library

Skills Used

• Python, Rich library, Click CLI

[Hell1213]

Review: doctor command

Hi @geetanunakani, the doctor command is useful and works well. Tests pass (72/72).

Minor style issue: The function has inline imports (import os, import sys, import shutil) inside the function body. The codebase convention is to put all imports at the top of the file. Please move these to the top of cli/oss_commands.py.

Also, add a blank line before the @oss_dev_group.command decorator for readability.

Other than that, the diagnostics look comprehensive and the Rich output is nice.