chore: add project config

Mode: yolo
Depth: quick
Parallelization: enabled
Workflow agents: research=on, plan_check=on, verifier=on

.planning/config.json

@@ -0,0 +1,12 @@
+{
+  "mode": "yolo",
+  "depth": "quick",
+  "parallelization": true,
+  "commit_docs": true,
+  "model_profile": "balanced",
+  "workflow": {
+    "research": true,
+    "plan_check": true,
+    "verifier": true
+  }
+}