Build MVP: campaigns, characters, combat, dice, compendium

- Rules abstraction (5e + pf2e) behind one interface, fully tested
- Pure combat engine: turn-order safe across add/remove/reorder/init-change
- Dexie storage with real cascade deletes + Zod validation on write
- Seedable dice engine with notation parser
- Lazy SRD compendium (code-split), bestiary -> combat
- Strict TS, 54 unit tests, Playwright e2e smoke (all green)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tsconfig.node.json

@@ -14,5 +14,5 @@
     "noUnusedParameters": true,
     "types": ["node"]
   },
-  "include": ["vite.config.ts", "scripts/**/*.ts"]
+  "include": ["vite.config.ts", "vitest.config.ts", "scripts/**/*.ts"]
 }