chore: scaffold reddit-post Playwright sidecar project

sidecars/reddit-post/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "reddit-post-sidecar",
+  "private": true,
+  "version": "1.0.0",
+  "description": "Playwright acceptance test that logs into Reddit and creates a text post, invoked via run.sh",
+  "scripts": {
+    "test": "playwright test"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.61.1"
+  }
+}