feat: Free: Add agentwatch doctor command to self-diagnose setup and API key issues

[SHAURYASANYAL3]

Resolves #420

Overview

This Pull Request implements the highly requested Free: Add agentwatch doctor command to self-diagnose setup and API key issues functionality into the AgentWatch CLI.

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Why do we need this?

For a 5-year-old: Sometimes our robot won't wake up because it forgot its keys or its batteries are in backwards. We want a "doctor" command to tell us exactly what's wrong!

For developers: Initial setup issues (missing .env variables, invalid API keys, incompatible library versions) are the #1 source of support tickets. A diagnostic tool saves everyone time.

What is it?

A new CLI command agentwatch doctor that checks the environment, validates API keys with lightweight pings, and verifies dependencies. This is a FREE feature.

Suggestions for Implementation

• Create a matrix of required environment variables for different frameworks (OpenAI, Anthropic, LangChain).
• Attempt a 1-token dummy request to verify API key validity.
• Output a rich table with green checkmarks or red X's and actionable fix instructions.

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Implementation Notes 🛠️

• Implemented via the typer framework in agentwatch/cli/main.py.
• Includes a beautiful terminal UI response using rich.
• Validated to pass all rigorous test suites, including conditional dependency checks.

[github-actions]

🧪 PR Test Results

Check	Result
Tests (pytest tests/)	✅ success
Lint (ruff check .)	❌ failure
Coverage (agentwatch)	74.06%

_{Python 3.12 · commit e610917}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 2b50aefb-c58e-4d60-a8de-25366927d65d

📥 Commits

Reviewing files that changed from the base of the PR and between 19bbbeb and e610917.

📒 Files selected for processing (2)

• agentwatch/cli/main.py
• tests/test_protocol.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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