chore: dependabot + PHP 8.4/8.5 CI matrix + PHPUnit 13 allowance

[karlwaldman]

What

• dependabot.yml — composer + github-actions ecosystems, monthly cadence, PR-limit 3 (repo had none)
• CI matrix — adds PHP 8.4 and 8.5 (current stable) alongside 8.1–8.3
• PHPUnit — widen dev constraint to ^10.5 || ^11.0 || ^12.0 || ^13.0 so newer PHP runners get the current major

Verification (local)

• PHP 8.5.8 + PHPUnit 13.2.4: vendor/bin/phpunit → OK (16 tests, 80 assertions)
• Also green on PHPUnit 12.5.31 (pre-change baseline)
• composer validate --strict passes

No runtime code touched — the SDK has zero runtime dependencies (ext-curl/ext-json only).

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: defaults

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Run ID: 628912bf-e95d-405b-ac70-4a18eb00f965

📥 Commits

Reviewing files that changed from the base of the PR and between 62ca766 and 28e86c9.

📒 Files selected for processing (4)

• .github/dependabot.yml
• .github/workflows/test.yml
• composer.json
• examples/smoke.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/ci-matrix-dependabot

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[karlwaldman]

CI note: the initial run failed on all 5 matrix jobs at the live-smoke step, not the unit tests — the OILPRICEAPI_TEST_KEY secret now gets HTTP 402 on /v1/prices/past_week (historical became a paid entitlement), so main would fail the same way today. Pushed 28e86c9: the smoke script treats 402/403 on the historical leg as a documented skip (latest() already proves auth/transport/parsing); any other error still fails. Verified locally with the same test key (exit 0, skip notice) and with a full-access key (exit 0, latest + past_week). Alternative if you prefer full coverage: swap the repo secret to a key with historical access.