ci: adopt estate reusable CI + split 300-line violations (v0.22.0)

- ci.yml → thin caller of peptide-e2e reusable CI (tests: brain-monkey)
  + keep check-constants as parallel job; workflow_call trigger enabled
- deploy.yml: retire standalone validate job; gate on ci.yml via workflow_call
- composer.json: add 'test' script (vendor/bin/phpunit --testdox)
- Version bumped to 0.22.0

300-line splits (9 files over limit → all under 300):
- class-keyword-extractor.php: shared tokeniser from Idea_Scorer + Semantic_Dedup
- class-image-aspect-ratio.php: aspect-ratio snap from OR provider + OR batch
- class-settings-sanitizer.php: option sanitization from Admin_Page
- class-settings-fields-images.php: image fields from Settings_Fields_Extended
- class-runware-image-validator.php: credential check from Runware_Image_Provider
- Runware batch: 15 phpcs:disable lines → 1 grouped suppression

Agent-Session: claude/adopt-ci-20260616

composer.json

@@ -1,23 +1,26 @@
 {
-"name": "peptiderepo/prautoblogger",
-"description": "WordPress plugin that auto-researches and publishes blog content using AI.",
-"type": "wordpress-plugin",
-"license": "GPL-2.0-or-later",
-"require": {
-"php": ">=7.4"
-},
-"require-dev": {
-"phpunit/phpunit": "^9.5",
-"brain/monkey": "^2.6"
-},
-"autoload": {
-"classmap": [
-"includes/"
-]
-},
-"autoload-dev": {
-"psr-4": {
-"PRAutoBlogger\\Tests\\": "tests/unit/"
+    "name": "peptiderepo/prautoblogger",
+    "description": "WordPress plugin that auto-researches and publishes blog content using AI.",
+    "type": "wordpress-plugin",
+    "license": "GPL-2.0-or-later",
+    "require": {
+        "php": ">=7.4"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.5",
+        "brain/monkey": "^2.6"
+    },
+    "autoload": {
+        "classmap": [
+            "includes/"
+        ]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "PRAutoBlogger\\Tests\\": "tests/unit/"
+        }
+    },
+    "scripts": {
+        "test": "vendor/bin/phpunit --testdox"
+    }
 }
-}
-}