Merge: Add Laravel 13, PHPUnit 12/13 support (PR #49)

Add support for Laravel 13, PHPUnit 12/13, and Testbench 11

fix: update GitHub links in README to point to the correct repository

docs: update CHANGELOG for v2.0.0 release

Add editor-specific AI config (.cursorrules, copilot-instructions.md)

Add AI agent guidance files (AGENTS.md, CLAUDE.md)

Merge pull request #47 from owlstacks/feature/rewrite-with-owlstack-core

Update README header with logo, flat-square badges, and Laravel branding

docs: update project documentation for production\n\n- Rewrite CHANGELOG.md with accurate feature entries\n- Fix CONTRIBUTING.md repo URLs (laravel-social-auto-posting → owlstack-laravel)\n- Add structured bug report template to ISSUE_TEMPLATE.md\n- Add CI/Packagist badges to README.md\n- Add all 11 platform usage examples and env vars to README\n- Update architecture diagram to include LinkedIn

ci: replace Travis CI with GitHub Actions\n\n- Remove .travis.yml (PHP 7.0/7.1, outdated)\n- Add .github/workflows/tests.yml with matrix:\n PHP 8.1–8.4 × Laravel 10–12\n- Exclude incompatible PHP 8.1 + Laravel 11/12 combos

docs: update example Laravel 12 project\n\n- Remove path repository, use Packagist dependency\n- Change minimum-stability from dev to stable\n- Add all 11 platform configs to example owlstack.php\n- Add testLinkedIn() controller method and route

test: add LinkedIn tests and fix env var names\n\n- Add LinkedIn credentials to TestCase and linkedinSuccess() helper\n- Add testLinkedInTextPost() in SendToTest\n- Update testToAllPublishesToAllPlatforms() to expect 4 platforms\n- Update ServiceProviderTest to verify LinkedIn registration\n- Fix .env.testing: correct Twitter and Facebook env var names\n- Add LinkedIn env vars to .env.testing

feat: add LinkedIn and all platform convenience methods\n\n- Add LinkedIn platform registration in ServiceProvider\n- Add LinkedIn config (access_token, person_id, organization_id)\n- Add SendTo convenience methods: linkedin(), reddit(), discord(),\n slack(), instagram(), pinterest(), whatsapp(), tumblr()\n- Update Facade docblocks for all 11 platforms

feat: migrate from path repository to Packagist\n\n- Replace local path repository with Packagist dependency\n- Change owlstack-core constraint from @dev to ^1.0\n- Set minimum-stability from dev to stable\n- Add homepage and support URLs\n- Add composer test script\n- Update description and keywords for all 11 platforms

chore: update contact email to ali@alihesari.com