fix: harden canonical PHP quickstart

[karlwaldman]

Closes #7

What changed

• reject malformed or empty successful latest-price responses instead of creating a zero-valued Price
• preserve the production source field and correct no-code singleton documentation
• publish the canonical OILPRICEAPI_KEY Brent first request with missing-config, 401, 403, and 429 recovery
• replace mutable product claims with canonical product-facts, pricing, catalog, and data-rights links
• build a Composer ZIP, install it into a clean project, and execute the packaged example against fixtures
• add a single strict production smoke, a public-claim drift test, and v2.1.0 metadata

Verification

• vendor/bin/phpunit (20 tests, 196 assertions)
• composer validate --strict
• composer audit --no-interaction
• PHP syntax lint across src, tests, and examples
• SDK_VERSION=v2.1.0 ./scripts/clean-install-smoke.sh
• strict production examples/smoke.php with the rotated synthetic smoke identity
• git diff --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 185937f0-9636-4475-9052-cd74730dd781

📥 Commits

Reviewing files that changed from the base of the PR and between 62ca766 and bec778b.

📒 Files selected for processing (14)

• .github/workflows/test.yml
• CHANGELOG.md
• README.md
• composer.json
• examples/quickstart.php
• examples/smoke.php
• scripts/clean-install-smoke.sh
• src/Client.php
• src/Exception/AuthenticationException.php
• src/Exception/RateLimitException.php
• src/Price.php
• tests/ClientTest.php
• tests/PublicClaimsTest.php
• tests/fixtures/router.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/php-sdk-canonical-quickstart

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