[observe] Verify Groq provider detection in observe()

[nagasatish007]

Summary

Verify that observe() correctly detects and instruments a Groq client instance via duck-typing. Add test coverage.

What to do

• Check src/observe/provider-detector.ts handles Groq's client shape
• Add a unit test in src/observe/__tests__/provider-detector.test.ts with a mocked Groq-like object
• If detection fails, add the duck-typing rule for Groq

Context

The provider detector uses duck-typing (checking for specific method signatures) rather than instanceof to identify which LLM provider a client belongs to. Each provider has a unique "signature" the detector looks for.

Groq's SDK is OpenAI-compatible but has slightly different internal structure. We need to ensure it's correctly identified as 'groq' rather than falling through to 'openai'.

Acceptance criteria

• Unit test passes with a mocked Groq client object
• detectProvider(groqClient) returns the correct ProviderSignature with provider: 'groq'
• If Groq wasn't detected before, the fix doesn't break existing provider detection
• Test file: src/observe/__tests__/provider-detector.test.ts

Helpful links

• Provider detector: src/observe/provider-detector.ts
• Groq SDK: https://github.com/groq/groq-node
• Existing tests: check the __tests__ folder for the pattern

[CleanDev-Fix]

Hi, I would like to work on this.

I inspected src/observe/provider-detector.ts; the Groq rule already matches the OpenAI-compatible chat.completions.create shape and identifies the api.groq.com base URL. My approach would be:

1. Add a focused regression test in src/observe/__tests__/provider-detector.test.ts using a mocked Groq-like client.
2. Assert that detectProvider returns the groq provider signature and the expected interception path.
3. Run the targeted test and the repository test, lint, and build commands.

I will keep this change limited to provider-detection coverage and will not alter the existing detection behavior unless the regression test exposes a failure. Does this approach fit what you had in mind?

[nagasatish007]

@CleanDev-Fix You can work on it. Thanks.