fix(telemetry): send X-SDK-Language and X-Client-Type headers

[karlwaldman]

Closes #4

What

The sync (OilPriceAPI) and async (AsyncOilPriceAPI) clients already sent X-SDK-Name and X-SDK-Version, but omitted the two telemetry headers the API uses to distinguish SDK traffic from raw python-httpx/python-requests calls. As reported in #4, 0/166 recent Python requests carried X-SDK-Language and X-Client-Type.

This adds the two missing headers to both clients (additive, 4 lines):

X-SDK-Language: python
X-Client-Type: sdk

X-SDK-Version was already present and is retained.

How (strict TDD: red → green → refactor)

1. RED — Added tests/test_telemetry_headers.py encoding the issue's acceptance criteria for both sync and async clients: headers are configured AND actually transmitted on the wire (via httpx.MockTransport capturing the outbound request). 6 of 8 assertions failed against the unpatched clients.
2. GREEN — Added X-SDK-Language: python and X-Client-Type: sdk to the header dict in client.py and async_client.py. All 8 new tests pass.
3. REFACTOR — None needed; change is minimal and already clean.

Test evidence

tests/test_telemetry_headers.py ........  [100%]
8 passed

# Full CI gate
ruff check oilpriceapi/        -> All checks passed!
pytest tests/ (not slow)       -> 328 passed (was 320 + 8 new)
mypy oilpriceapi/client.py oilpriceapi/async_client.py --ignore-missing-imports -> Success: no issues found

Note: a full-tree mypy oilpriceapi/ run in this local env errors only inside the third-party numpy/__init__.pyi stub under Python 3.14 (type statement support); this failure is identical on the unmodified baseline and is unrelated to this change. The changed files type-check cleanly, and CI runs on the supported Python 3.8–3.12 targets.

Scope

Additive only. No migrations, Stripe, auth, routes, or customer-facing copy touched.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6cdc1269-fb62-4e55-905b-cf738c328f8b

📥 Commits

Reviewing files that changed from the base of the PR and between 7c7b777 and 8efeeab.

📒 Files selected for processing (3)

• oilpriceapi/async_client.py
• oilpriceapi/client.py
• tests/test_telemetry_headers.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sprint-loop/issue-4

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