ci: keyless demo smoke tier + fix weekly-health skips/failures (#48)

[karlwaldman]

Summary

Implements the two-tier live-smoke pattern from #48 and fixes the failures/silent skips that were keeping Weekly SDK Health Check red (last run 2026-07-06: 2 failures + live futures/subscriptions silently skipped).

Tier the live jobs (#48)

• live-tests.yml: new always-run keyless demo smoke step (tests/integration/test_demo_contract.py, hits public /v1/demo/*, needs no secret, has no gate — it structurally cannot silently skip), followed by the keyed live suite which now emits a ::warning:: instead of silently exiting 0 when the secret is unavailable (forks).
• weekly-health.yml: same keyless tier added, and the secret is now exported as both OILPRICEAPI_KEY and OILPRICEAPI_TEST_KEY. The conftests read the former but test_live_futures.py / test_live_subscriptions.py read the latter — the mismatch meant those live tests skipped on every weekly run even though the secret is populated.

Fix the tests that kept weekly-health red

• test_historical_endpoints.py: two tests asserted >300 / >1000 datapoints for 1-year/5-year queries, but the API paginates time-window responses at 100 points/page — they could never pass. Now assert non-empty data and keep the timing baselines (<120s / <180s), which are the actual v1.4.1-regression guards.
• test_api_contract.py: the API now returns HTTP 400 invalid_code (with suggestions) for unknown commodity codes instead of 404 — exactly the kind of drift these contract tests exist to catch, but the failures were masked because the weekly job died at the earlier step. Both tests updated to the current contract (verified live).

Test evidence (local, against production API)

• Keyless demo smoke with no key in env — 4 passed
• pytest tests/ -m integration --timeout=90 (both env names set, as the workflow now does) — 16 passed, 2 skipped (previously 2 failed + 5 silently skipped)
• pytest tests/ -m contract --timeout=90 — 21 passed, 1 skipped (previously 2 failed)
• Unit gate pytest tests/ --ignore=tests/integration --ignore=tests/contract -m 'not slow' — 328 passed, 10 skipped

Closes #48

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d6ea7446-9566-43a3-9c38-719a0765fcf0

📥 Commits

Reviewing files that changed from the base of the PR and between 6cfa2d8 and 479ade4.

📒 Files selected for processing (4)

• .github/workflows/live-tests.yml
• .github/workflows/weekly-health.yml
• tests/contract/test_api_contract.py
• tests/integration/test_historical_endpoints.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/live-smoke-tiering

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