Improved bundle documentation

[stixx]

Summary

Pre-1.0 documentation pass: name the bundle's public API surface in the README, add a single page covering each extension point with a worked example, and clarify the two validation layers up front in the validation guide.

Changes

• README: new "Stability & supported API" section listing all 10 @api items, plus a "Two-Layer Validation" feature bullet that names both the OpenAPI schema layer and the Symfony Validator layer.
• docs/extension-points.md (new): one example each for ValidatorInterface, ResponderInterface, StatusResolverInterface, ExceptionToApiProblemTransformerInterface, plus how to throw ApiProblemException directly. Includes an architectural note that ApiProblemException is HTTP-layer and shouldn't be thrown from handlers.
• docs/validation.md: opening paragraph replaced with a table that disambiguates OpenAPI request validation vs Symfony Validator (what each validates, what drives it, when it runs).

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📥 Commits

Reviewing files that changed from the base of the PR and between bd15297 and 503bba3.

📒 Files selected for processing (3)

• README.md
• docs/extension-points.md
• docs/validation.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs-extension-points

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