chore: finish package to Blax standard (namespace, README, tests, scaffolding)
- Rename namespace BlaxSoftware\ReactPhpKernel -> Blax\ReactPhpKernel (house
standard; the BlaxSoftware\LaravelWebSockets form is grandfathered only there)
- README rewritten to the Blax OSS package principles: OSS banner, title+badges,
emoji feature list, quick start, what's-in-the-box, testing, star history
- Add PHPUnit suite (13 tests / 19 assertions, green) + phpunit.xml.dist
- Add pint.json (laravel preset, applied), composer scripts (test/lint),
.gitattributes export-ignores, test.sh (nix), CHANGELOG
- composer.json: Blax psr-4, PHP ^8.1-^8.4, dev deps
rel learn-atc #1055
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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