Implement the 004-edit-combatant feature that adds the possibility to change a combatants name

specs/004-edit-combatant/quickstart.md

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+# Quickstart: Edit Combatant
+
+**Feature**: 004-edit-combatant
+
+## Setup
+
+```bash
+pnpm install          # Install dependencies (if needed)
+pnpm check            # Verify everything passes before starting
+```
+
+## Development
+
+```bash
+pnpm --filter web dev          # Start dev server at localhost:5173
+pnpm test:watch                # Run tests in watch mode
+```
+
+## Implementation Order
+
+1. **Domain event** — Add `CombatantUpdated` to `events.ts`
+2. **Domain function** — Create `edit-combatant.ts` with pure `editCombatant` function
+3. **Domain tests** — Create `edit-combatant.test.ts` with acceptance scenarios + invariants
+4. **Domain exports** — Re-export from `index.ts`
+5. **Application use case** — Create `edit-combatant-use-case.ts`
+6. **Application exports** — Re-export from `index.ts`
+7. **Hook** — Add `editCombatant` action to `useEncounter` hook
+8. **UI** — Add inline name editing to `App.tsx`
+
+## Verification
+
+```bash
+pnpm check    # Must pass — format + lint + typecheck + test
+```
+
+## Key Files to Reference
+
+- `packages/domain/src/add-combatant.ts` — Pattern to follow for domain function
+- `packages/domain/src/remove-combatant.ts` — Pattern for "not found" error handling
+- `packages/application/src/add-combatant-use-case.ts` — Pattern for use case
+- `apps/web/src/hooks/use-encounter.ts` — Pattern for hook wiring