Phase 1: player character depth

- Inventory + currency + encumbrance vs carrying capacity
- Class resources with correct short/long/daily rest recovery (applyRest)
- Spellcasting: slots (+pact), known/prepared spells, derived DC + attack
- Defenses: 5e death saves/inspiration/exhaustion, pf2e dying/wounded/hero points
- Derived weapon attacks + passive perception via extended RulesSystem
- Dexie v2 migration backfills new fields; debounced save flushes on pagehide
- 9 new unit tests, new character-depth e2e; all green

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

src/lib/rules/index.ts

@@ -17,4 +17,5 @@ export const SYSTEM_OPTIONS: { id: SystemId; label: string }[] = [
 ];
 
 export * from './types';
-export { abilityModifier, ABILITY_ABBR, ABILITY_LABELS } from './abilities';
+export { abilityModifier, ABILITY_ABBR, ABILITY_LABELS, formatDamage } from './abilities';
+export { applyRest } from './rest';