feat(providers): Add Groq provider adapter

[sunilp]

Summary

Add a Groq provider adapter for fast inference with open models.

Details

Groq's API is OpenAI-compatible, so this could either extend a shared OpenAI-compatible base class or be a standalone adapter.

Requirements

• Create src/providers/groq.ts implementing the ProviderAdapter interface
• Support streaming via SSE
• Register in src/providers/factory.ts
• Add unit tests in src/providers/groq.test.ts

Reference

• Groq API Docs
• Existing Ollama adapter: src/providers/ollama.ts

Getting Started

See Adding a New Provider in the README.

[sunilp]

✅ Implemented and verified — closing

Merged in #11 (commit 1c908d9).

Delivered:

• src/providers/groq.ts — GroqAdapter extends OpenAIAdapter (Groq's API is OpenAI-compatible)
• Default base URL: https://api.groq.com/openai, default model: llama3-8b-8192
• API key from GROQ_API_KEY env var or profile apiKey
• Registered in factory.ts

Test results — 4/4 tests pass (npm test, 160 total):

✓ src/providers/groq.test.ts (4)
  has correct provider name
  streams completions via Groq API
  resolves validateCredentials when API key is valid
  reads API key from GROQ_API_KEY env var

Usage:

GROQ_API_KEY=gsk_... jam ask "Hello" --provider groq --model llama3-8b-8192