chore: add project config, update gitignore for .planning/

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -3,6 +3,8 @@
 *.json
 !lang/
 !lang/*.json
+!.planning/
+!.planning/**
 !wiki/
 !wiki/*.html
 !wiki/*.md

.planning/config.json

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