chore: add project config

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

.planning/config.json

@@ -0,0 +1,13 @@
+{
+  "mode": "yolo",
+  "granularity": "coarse",
+  "parallelization": true,
+  "commit_docs": true,
+  "model_profile": "quality",
+  "workflow": {
+    "research": true,
+    "plan_check": true,
+    "verifier": true,
+    "nyquist_validation": true
+  }
+}