Initial TTRPG character meta-builder with visual sheet editor.

Offline Electron app seeds 10 system presets, supports create-from-scratch designer with palette/drag/resize/bricks, and exports .ttrpg-system.json for the player.

Co-authored-by: Cursor <cursoragent@cursor.com>

.planning/PROJECT.md

@@ -0,0 +1,17 @@
+# TTRPG Character Builder — Project
+
+## Vision
+
+Offline Electron meta-builder for TTRPG system schemas and character sheets, with export into TTRPG Player (`meta_builder` branch only).
+
+## Constraints
+
+- Electron offline; same pack targets as TTRPG Player
+- Player changes only on git branch `meta_builder` (never merge to main in this workstream)
+- Portable `app/shared` contract for player + future mobile
+- Functional tests + e2e (not smoke-only)
+- Depth B sheets; 10 presets; spell compendium UI; React Flow progression; no ICE combat / hit-location roller
+
+## Current status
+
+Scaffold live: shared engine + SQLite builder + UI shell + 10 preset files + player GameSystemsStore/IPC/modal.