Add community files and fix LICENSE

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug in the Page Graph extension
+title: "[BUG] "
+labels: bug
+---
+
+## Environment
+
+- **TYPO3 version**: (e.g. 13.4.5)
+- **PHP version**: (e.g. 8.3)
+- **Extension version**: (e.g. 1.0.0)
+- **Browser**: (e.g. Chrome 120)
+
+## Description
+
+A clear description of the bug.
+
+## Steps to Reproduce
+
+1. Go to ...
+2. Click on ...
+3. Observe ...
+
+## Expected Behavior
+
+What you expected to happen.
+
+## Actual Behavior
+
+What actually happened.
+
+## Screenshots
+
+If applicable, add screenshots to help explain the problem.
+
+## Additional Context
+
+Any other information that might be relevant (error logs, related configuration, etc.).

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or improvement
+title: "[FEATURE] "
+labels: enhancement
+---
+
+## Description
+
+A clear description of the feature you would like.
+
+## Use Case
+
+Why is this feature needed? What problem does it solve?
+
+## Proposed Solution
+
+If you have an idea for how this could be implemented, describe it here.
+
+## Alternatives Considered
+
+Any alternative approaches you have considered.
+
+## Additional Context
+
+Any other information, mockups, or references that might be helpful.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+What does this PR do? Briefly describe the changes.
+
+## Related Issue
+
+Closes #<!-- issue number -->
+
+## Checklist
+
+- [ ] PR targets the `develop` branch
+- [ ] Code follows PSR-12 and uses `declare(strict_types=1)`
+- [ ] PHPStan level 8 passes
+- [ ] PHP-CS-Fixer passes
+- [ ] Unit tests pass
+- [ ] New/changed functionality includes tests
+- [ ] Commit messages are clear and descriptive

CONTRIBUTING.md

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+# Contributing to Page Graph
+
+Thank you for considering a contribution to the `page_graph` TYPO3 extension!
+
+## Branching Model
+
+1. **Fork** this repository on GitHub.
+2. Create a **feature branch** from `develop` (e.g. `feature/my-change`).
+3. Open a **Pull Request** targeting `develop`.
+
+The `main` branch is reserved for releases and has branch protection enabled.
+
+## Development Setup
+
+### With DDEV (recommended)
+
+```bash
+git clone git@github.com:<your-fork>/page-graph.git packages/page_graph
+ddev start
+ddev composer install
+ddev typo3 extension:setup
+ddev typo3 cache:flush
+```
+
+### Standalone (without DDEV)
+
+```bash
+git clone git@github.com:<your-fork>/page-graph.git
+cd page-graph
+composer install
+```
+
+## Coding Standards
+
+- **PSR-12** coding style
+- `declare(strict_types=1);` in every PHP file
+- Type hints on all parameters and return types
+- **PHPStan level 8** must pass without errors
+
+## Running Quality Tools
+
+```bash
+# Static analysis
+vendor/bin/phpstan analyse
+
+# Code style check
+vendor/bin/php-cs-fixer fix --dry-run --diff
+
+# Code style fix
+vendor/bin/php-cs-fixer fix
+
+# Unit tests
+vendor/bin/phpunit
+```
+
+If you use DDEV, prefix commands with `ddev exec`.
+
+## Pull Request Checklist
+
+Before submitting your PR, please ensure:
+
+- [ ] Code follows PSR-12 and uses strict types
+- [ ] PHPStan level 8 passes (`vendor/bin/phpstan analyse`)
+- [ ] PHP-CS-Fixer passes (`vendor/bin/php-cs-fixer fix --dry-run`)
+- [ ] Unit tests pass (`vendor/bin/phpunit`)
+- [ ] New features include tests where applicable
+- [ ] Commit messages are clear and descriptive
+- [ ] PR targets the `develop` branch
+
+## Reporting Issues
+
+Please use the [GitHub issue tracker](https://github.com/rtfirst/page-graph/issues) for bug reports and feature requests. Security vulnerabilities should be reported privately -- see [SECURITY.md](SECURITY.md).