Refresh tooling: target WordPress 7.0, update dependencies, remove devcontainer

- Point wp-env and Playground blueprint at WordPress 7.0
- Update Composer and npm dependencies (ncu -u) and rebuild assets
- Remove Codespaces .devcontainer configuration
- Ignore .reviews/ output

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jeremyfelt

.devcontainer/devcontainer.json

@@ -1,3 +1,4 @@
 node_modules
 .claude
 .phpunit.result.cache
+.reviews/

.gitignore

@@ -1,5 +1,5 @@
 {
-	"core": "WordPress/WordPress#6.9",
+	"core": "WordPress/WordPress#7.0",
 	"phpVersion": "8.2",
 	"plugins": [
 		"."

.wp-env.json

@@ -2,7 +2,7 @@
 	"landingPage": "/wp-admin/post-new.php",
 	"preferredVersions": {
 		"php": "8.2",
-		"wp": "latest"
+		"wp": "7.0"
 	},
 	"steps": [
 		{