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>

README.md

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+# TTRPG Manager
+
+A local-first campaign manager for **D&D 5e** and **Pathfinder 2e**, built for both
+Game Masters and players. Runs entirely in the browser (installable as a PWA) — your
+data lives in IndexedDB on your device; no account, no server.
+
+## Features (MVP)
+
+- **Campaigns** — create per-system campaigns; deleting one cascades to all its data.
+- **Characters** — 5e/PF2e sheets with live derived stats: ability modifiers,
+  proficiency, skills, saves, AC, initiative, HP (with damage/heal/temp). Autosaves.
+- **Combat tracker** — initiative order, round/turn tracking, conditions, HP, and
+  add/remove/reorder mid-fight without ever corrupting whose turn it is.
+- **Dice** — full notation (`2d6+3`, `4d6kh3`), advantage/disadvantage, seedable RNG,
+  per-campaign roll history.
+- **Compendium** — searchable SRD bestiary, spells, and magic items. Add any monster
+  straight into the open encounter.
+
+## Tech
+
+- React 19 + TypeScript (strict) + Vite
+- TanStack Router · Zustand · Zod · Dexie (IndexedDB) · Tailwind v4 · Fuse.js
+- Vitest (unit) + Playwright (e2e), PWA via vite-plugin-pwa
+
+## Architecture
+
+```
+src/
+  lib/
+    rules/        # game-system abstraction — 5e & pf2e behind one RulesSystem interface
+    combat/       # pure, tested turn-order + HP engine
+    dice/         # notation parser + roller
+    db/           # Dexie schema + repositories (cascade deletes, validation on write)
+    schemas/      # Zod entity schemas — every number rejects NaN/Infinity
+    compendium/   # lazy SRD data loaders (code-split out of the main bundle)
+  features/       # campaigns, characters, combat, dice, compendium (UI)
+  components/ui/  # design-system primitives
+  data/srd/       # SRD JSON (Open5e + MPMB); regenerate with scripts/fetch_data.py
+```
+
+The rules layer means features never branch on `if (system === '5e')`; they call the
+`RulesSystem` interface, so adding a system is a self-contained module.
+
+## Development
+
+```bash
+bun install
+bun run dev          # dev server at http://localhost:5173
+bun run test         # unit tests (vitest)
+bun run test:e2e     # end-to-end (playwright)
+bun run build        # typecheck + production build
+bun run lint
+```
+
+## Roadmap
+
+Notes/journal, maps with fog of war, encounter/loot builders, a shared player view,
+PF2e compendium data, and an optional sync backend for real-time tables.
+
+## History
+
+This is a from-scratch rebuild. The previous implementation (deleted) had ~135
+documented bugs and no version control; its bug report is kept at
+`docs/OLD_BUG_HUNT_REPORT.md` as a record of failure modes designed against here
+(silent data loss, turn-order corruption, no cascade deletes, NaN inputs, dead
+Tauri integration). The SRD data and Python scrapers were preserved.