Switch to JSON store so Electron runs without native sqlite rebuild.

Auto-seeds 10 presets on first launch; visual designer with palette, drag, resize, and bricks CRUD.

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

docs/adr/001-core.md

@@ -2,38 +2,20 @@
 
 ## Decision
 
-Electron + React + TypeScript + Vite; SQLite with JSON documents for systems/characters; portable `app/shared` contract for future TTRPG Player + mobile.
+Electron + React + TypeScript + Vite; JSON file store (`userData/store.json`) for systems/characters; portable `app/shared` contract for future TTRPG Player + mobile.
 
 ## Rationale
 
-Matches TTRPG Player packaging targets; offline-first; no Postgres.
+Offline-first; avoids native module rebuild (better-sqlite3) requiring Visual Studio on Windows.
 
 # ADR-002: Formula DSL
 
-## Decision
-
-Custom minimal expression language (`floor`, `ceil`, `round`, `min`, `max`, `clamp`, arithmetic, `attr.*` / `skill.*` / `resource.*` / `derived.*`).
-
-## Rationale
-
-Same evaluator can be copied into the player; explicit rounding; no heavy CEL/JSONata dependency.
+Custom minimal expression language with explicit rounding; portable to the player.
 
 # ADR-003: Schema freeze via snapshotHash
 
-## Decision
-
-Player binds store `snapshotHash` (content-addressed) rather than inline full schema per character.
-
-## Rationale
-
-Implements freeze-on-bind without bloating `players.json`.
+Player binds store `snapshotHash` rather than inline full schema per character.
 
 # ADR-004: Spells from dnd.su
 
-## Decision
-
-Provide an import pipeline for PHB-labelled spells from dnd.su at product owner request, with README/IP disclaimer. Prefer SRD stubs in default presets.
-
-## Rationale
-
-Owner requested PHB coverage; redistribution risk acknowledged.
+Import pipeline for PHB-labelled spells at product owner request, with IP disclaimer. Default presets ship SRD stubs.