P1: correct PyPI source and freshness claims

[karlwaldman]

Closes #65.\n\n## Changes\n- replaces mutable real-time/catalog/traffic/entitlement claims with the reviewed product-facts contract\n- makes the canonical first request fail closed without currency, unit, source, and an exact API timestamp field\n- corrects the historical snippet endpoint and adds a storefront claim gate\n- releases the existing additive well-production work with these storefront corrections as 1.11.0\n\n## Verification\n- Ruff and mypy pass\n- 355 tests pass, 10 skip; 59.36% coverage\n- wheel and sdist build; Twine checks both\n- package METADATA reports 1.11.0 and the source-timestamped summary

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📥 Commits

Reviewing files that changed from the base of the PR and between c872371 and a20b012.

📒 Files selected for processing (11)

• .github/workflows/test.yml
• CHANGELOG.md
• README.md
• examples/snippets/latest_price.py
• examples/snippets/manifest-source.json
• oilpriceapi/__init__.py
• oilpriceapi/version.py
• pyproject.toml
• scripts/validate_storefront_claims.py
• tests/test_snippet_manifest.py
• tests/test_storefront_claims.py

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