Remove the Docker-based local test setup

CHANGELOG.md

@@ -27,6 +27,7 @@ Ground-up port from the latest Readability.js (v0.6.0) using Claude's Fable mode
 - HTML5-PHP dependency; `ext-xml` requirement
 - Options that existed as libxml workarounds: `parser`, `substituteEntities`, `normalizeEntities`, `summonCthulhu`
 - The custom DOM subclass layer (`src/Nodes/`) and its workarounds (attribute-based state, shifting-aware iteration)
+- The Docker-based local test setup (`docker-compose.yml`, `Makefile`, `docker/`); tests and static analysis run directly on PHP 8.4/8.5, locally and in CI
 
 ## [v3.3.3](https://github.com/fivefilters/readability.php/releases/tag/v3.3.3)
 - Fix type error - extends type support to add DOMProcessingInstruction in more method signatures (reported by @reinierkors)

CONTRIBUTING.md

@@ -37,8 +37,9 @@ Things that intentionally differ from the JS (don't "fix" these): scoring state
 ``` bash
 $ ./vendor/bin/phpunit      # requires PHP 8.4+
 $ ./vendor/bin/psalm        # static analysis; CI runs this too
-$ make test-all             # multiple PHP versions; requires docker and docker-compose
 ```
 
+CI runs both on PHP 8.4 and 8.5.
+
 
 **Happy coding**!

README.md

@@ -219,11 +219,7 @@ composer install --prefer-source
 ./vendor/bin/phpunit
 ```
 
-To test against multiple PHP versions with Docker:
-
-```bash
-make test-all   # or make test-8.4 / make test-8.5
-```
+CI runs the suite (plus [Psalm](https://psalm.dev/) static analysis) on PHP 8.4 and 8.5.
 
 ### Updating the expected test output