chore: release v0.9.0

[koriym]

Summary

Cut release v0.9.0. Promotes the [Unreleased] section to [0.9.0] - 2026-04-30.

Highlights

• BREAKING: drop PHP 8.1 support (build: upgrade to PHPUnit 11 and drop PHP 8.1 #75) — minimum is now ^8.2, PHPUnit 11
• New: xcompare breakpoint comparison tool, xstep JSON ergonomics (--pretty, --max-value-bytes, --max-depth), composer demo, bin/xrepl and bin/xcompare exposed via composer (feat(xstep): improve JSON ergonomics for real debugging sessions #74, docs: clarify README and demo smoke test scope #76)
• README CLI examples corrected (docs: clarify README and demo smoke test scope #76)

See CHANGELOG.md for the full list.

Test plan

• composer validate
• After merge: tag v0.9.0 and gh release create

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b5883a and 0aa59a9.

📒 Files selected for processing (1)

• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-prep-v0.9.0

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