docs(wpmc S6): README Testing section + mark S6 done in roadmap

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

README.md

@@ -15,6 +15,25 @@
 1. Скачать архив или склонировать в `wp-content/plugins/wp-multi-city/`.
 2. Активировать в админке WP. Если ACF Pro не активен — увидите admin-notice об ошибке зависимости.
 
+## Testing
+
+### Automated (PHPUnit)
+
+```bash
+composer install
+vendor/bin/phpunit
+```
+
+Expected: 98 tests, 175 assertions green. Unit-level coverage via Brain Monkey + Mockery + Patchwork — no real WordPress required; the full suite runs in under one second.
+
+### Manual QA
+
+For end-to-end verification against a real WordPress installation, see `docs/QA-CHECKLIST.md` — 13 sections covering activation, admin UI, helpers, shortcode, router, page clones, URL filters, REST URL.
+
+### CI
+
+`.gitea/workflows/test.yml` runs PHPUnit on every push to `main` and every pull request. The workflow becomes active once the repo is mirrored to Gitea (S7).
+
 ## Roadmap MVP
 
 | Этап | Содержание | Beads | Статус |
@@ -24,7 +43,7 @@
 | S3 | `[shortcode_dmr id=N]` + хелперы (`current_town`, `_alt_get_field`, `remove_domain_link`) | cp-arq | done |
 | S4 | URL-роутер `/{city}/{path}/` + `page_unic` + `main_page_alt` | cp-83m | done |
 | S5 | Фильтры `the_title`/`the_content`/`the_permalink`/`rest_url` | cp-i17 | done |
-| S6 | PHPUnit-тесты | cp-la7 | open |
+| S6 | PHPUnit-тесты | cp-la7 | done |
 | S7 | Релиз через Gitea + plugin-update-checker | cp-7cf | open |
 
 Эпик: `cp-cw4`.