Add Beancount driver plugin

Author: salmonumbrella

.gitignore

@@ -150,7 +150,14 @@ Libs/*.a
 Libs/.downloaded
 Libs/dylibs/
 Libs/ios/
+Libs/rustledger/
 fix-1322-plugin-abi-and-registry-overhaul.diff
 
 # Issue analysis blueprints (local only)
 .analysis/
+
+# Local planning and assistant history
+.specstory/
+.planning/
+.plans/
+planning/