feat: market-brief + agent-subscription methods (sync+async, v1.9.0)

[karlwaldman]

Adds Python SDK support for the now-live #3245 endpoints on both the sync (OilPriceAPI) and async (AsyncOilPriceAPI) clients.

Methods added

Market brief

• client.market_brief(codes, narrative=False) → MarketBrief
• await client.market_brief(...) (async mirror)

Agent subscriptions (client.subscriptions / await client.subscriptions)

• .list() → List[Subscription]
• .create(codes, interval, name=None, source=None, tool=None) → Subscription
  • friendly interval mapping: "5m"/"1h"/"daily" (and "<n>s/m/h/d" / raw int) → interval_seconds
  • X-OPA-Source / X-OPA-Tool attribution headers (default source sdk-python)
• .delete(id) → bool
• .events(since=None, limit=None, watch_id=None) → SubscriptionEventsPage (iterable; .events, .cursor, .has_more)

Models (exported from package root): MarketBrief, MarketBriefCommodity, MarketBriefForecast, Subscription, SubscriptionEvent, plus SubscriptionEventsPage.

Version bumped 1.8.1 → 1.9.0 (pyproject.toml + version.py). README updated with sync + async usage examples. No release tag cut.

Live-test result

A read-only live integration test was added (tests/integration/test_live_subscriptions.py, marked live): market_brief(["BRENT_CRUDE_USD"]) returns 200 + a positive price, and subscriptions.list() returns 200. It uses OILPRICEAPI_TEST_KEY and skips automatically when absent (no prod writes in CI by default).

Not executed against production in this run — no OILPRICEAPI_TEST_KEY was available in the environment, so the live tests skipped as designed (2 skipped). The mocked unit tests fully exercise the request shapes, interval mapping, attribution headers, and response parsing.

Gates

Gate	Command	Result
mypy	mypy oilpriceapi/ --ignore-missing-imports	✅ Success, no issues (43 files)
ruff	ruff check oilpriceapi/	✅ All checks passed
pytest	pytest tests/ --ignore=tests/integration --ignore=tests/contract -m 'not slow' --cov=oilpriceapi	✅ 311 passed, 9 skipped, cov 59.33% (>50% gate)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3999e652-138b-4ee9-8112-156d3444a7a0

📥 Commits

Reviewing files that changed from the base of the PR and between 785b385 and d24affe.

📒 Files selected for processing (14)

• README.md
• oilpriceapi/__init__.py
• oilpriceapi/_subscriptions_common.py
• oilpriceapi/async_client.py
• oilpriceapi/async_resources.py
• oilpriceapi/client.py
• oilpriceapi/models.py
• oilpriceapi/resources/__init__.py
• oilpriceapi/resources/subscriptions.py
• oilpriceapi/version.py
• pyproject.toml
• tests/integration/test_live_subscriptions.py
• tests/unit/test_async_subscriptions_resource.py
• tests/unit/test_subscriptions_resource.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/3245-subscriptions

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