Add CLAUDE.md with project documentation

Comprehensive guide covering project goal, repository structure,
PHP version requirements, development commands, coding standard,
testing, CI pipeline, and how the extension works.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

CLAUDE.md

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+# CLAUDE.md
+
+This is the `phpstan/phpstan-dibi` repository — a PHPStan extension for the [Dibi](https://dibi.nette.org/) database library.
+
+## Project Goal
+
+This extension teaches PHPStan about dynamic methods on `Dibi\Fluent`. Dibi's fluent query builder uses `__call()` to handle SQL clause methods (like `->select()`, `->where()`, `->orderBy()`, etc.) dynamically. Without this extension, PHPStan would report errors for every such method call. The extension tells PHPStan that any method called on `Dibi\Fluent` is valid, accepts variadic arguments, and returns `Dibi\Fluent` (for chaining).
+
+The extension also registers `Dibi\Row` as a universal object crate (dynamic property access without errors).
+
+## Repository Structure
+
+```
+src/
+  Reflection/Dibi/
+    DibiFluentClassReflectionExtension.php   # MethodsClassReflectionExtension implementation
+    DibiFluentMethodReflection.php           # MethodReflection for dynamic Dibi\Fluent methods
+tests/
+  Reflection/Dibi/
+    DibiFluentClassReflectionExtensionTest.php  # Unit tests
+  bootstrap.php
+extension.neon      # PHPStan extension config (registered service + parameters)
+phpstan.neon        # PHPStan config for analysing this project itself
+phpunit.xml         # PHPUnit configuration
+composer.json       # Composer package definition
+Makefile            # Build commands
+```
+
+## PHP Version Requirement
+
+This project supports **PHP 7.4+**. The composer.json platform is set to `7.4.6`. Do not use PHP 8.0+ syntax (named arguments, union types in declarations, match expressions, constructor promotion, etc.) in the source code.
+
+## Dependencies
+
+- **phpstan/phpstan**: `^2.0` (required)
+- **dibi/dibi**: conflicts with `<3.0`, dev dependency on `~4.0`
+
+## Development Commands
+
+All commands are defined in the `Makefile`:
+
+- `make check` — runs all checks (lint, cs, tests, phpstan)
+- `make tests` — runs PHPUnit tests
+- `make lint` — runs php-parallel-lint on `src/` and `tests/`
+- `make cs` — runs PHP_CodeSniffer with phpstan/build-cs coding standard
+- `make cs-fix` — auto-fixes coding standard violations
+- `make cs-install` — clones and installs the phpstan/build-cs coding standard (2.x branch)
+- `make phpstan` — runs PHPStan at level 8 on `src/` and `tests/`
+
+## Coding Standard
+
+This project uses [phpstan/build-cs](https://github.com/phpstan/build-cs) (2.x branch) for coding standards enforcement via PHP_CodeSniffer. To set it up locally, run `make cs-install` before `make cs`.
+
+## Testing
+
+Tests use PHPUnit 9.6 with the `PHPStan\Testing\PHPStanTestCase` base class. Test files are in `tests/` and follow the same namespace structure as `src/`. Test classes must end with `Test.php`.
+
+## CI Pipeline
+
+The GitHub Actions workflow (`.github/workflows/build.yml`) runs on the `2.0.x` branch and pull requests:
+
+- **Lint**: PHP 7.4, 8.0, 8.1, 8.2, 8.3, 8.4
+- **Coding Standard**: PHP 8.2
+- **Tests**: PHP 7.4–8.4, both lowest and highest dependency versions
+- **PHPStan**: PHP 7.4–8.4, both lowest and highest dependency versions
+
+## How the Extension Works
+
+1. `extension.neon` registers `DibiFluentClassReflectionExtension` as a `phpstan.broker.methodsClassReflectionExtension` service.
+2. `DibiFluentClassReflectionExtension::hasMethod()` returns `true` for any method on `Dibi\Fluent`.
+3. `DibiFluentClassReflectionExtension::getMethod()` returns a `DibiFluentMethodReflection` that describes the method as public, non-static, variadic, and returning `Dibi\Fluent`.
+4. `Dibi\Row` is registered as a universal object crate in `extension.neon` parameters.
+
+## Branch
+
+The main development branch is `2.0.x`.