docs: add REQ-CS-007 PHP-FIG PSR evaluation

Document Adopted vs N/A PSR decisions in docs/PSR.md and link it from the README Documentation section.

Author: HecFranco

README.md

@@ -101,6 +101,7 @@ cd demo/symfony8 && cp .env.example .env && make up   # Symfony 8, port 8022
 
 - [Installation](docs/INSTALLATION.md)
 - [Configuration](docs/CONFIGURATION.md)
+- [PSR evaluation (REQ-CS-007)](docs/PSR.md)
 - [Usage](docs/USAGE.md)
 - [Contributing](docs/CONTRIBUTING.md)
 - [Code of Conduct](CODE_OF_CONDUCT.md)

docs/PSR.md

@@ -0,0 +1,37 @@
+# PHP-FIG PSR evaluation (REQ-CS-007)
+
+Package: `nowo-tech/word-to-pdf-bundle` (`symfony-bundle`)
+
+This document records which [PHP-FIG PSRs](https://www.php-fig.org/psr/) apply to this package.
+Only contracts that add clear interoperability or maintainability value are **Adopted**.
+Others are **N/A** (or already covered by Symfony) so the decision stays auditable.
+
+## Baseline (always)
+
+| PSR | Decision | How |
+| --- | -------- | --- |
+| PSR-12 (coding style) | **Adopted** | `@PSR12` in `.php-cs-fixer.dist.php` (Nowo REQ-CS-001). |
+| PSR-4 (autoloading) | **Adopted** | `composer.json` `autoload` / `autoload-dev` PSR-4 map for package sources and tests. |
+
+## Interface / contract PSRs
+
+| PSR | Decision | Notes |
+| --- | -------- | ----- |
+| PSR-3 Logger | **Adopted** | Type-hint `Psr\Log\LoggerInterface` on services that log; injectable via Symfony DI. |
+| PSR-6 / PSR-16 Cache | **N/A** | No package-owned cache layer. |
+| PSR-7 / PSR-17 HTTP messages | **N/A** | Symfony HttpFoundation (or no HTTP messages API) is the correct surface; a PSR-7 bridge would not help consumers. |
+| PSR-18 HTTP client | **N/A** | No outbound HTTP client. |
+| PSR-11 Container | **N/A** | No container locator in the public API; constructor injection only. |
+| PSR-14 Event dispatcher | **Already satisfied via Symfony** | Uses Symfony `EventDispatcherInterface` / subscribers (PSR-14 compatible). No separate FIG dependency required. |
+| PSR-15 HTTP middleware | **N/A** | Uses Symfony kernel listeners/subscribers (or has no HTTP middleware pipeline). |
+| PSR-20 Clock | **N/A** | No time-sensitive domain logic requiring a clock SPI. |
+
+## Summary
+
+- **Adopted beyond baseline:** PSR-3 Logger
+- **Rule:** do not add `psr/*` Composer dependencies without matching type-hints and DI wiring.
+- **Re-evaluate** when the package gains logging, HTTP, cache, clock, or event SPIs.
+
+---
+
+_REQ-CS-007 evaluation date: 2026-08-21._