test(combat): stop asserting the deleted experience reward contract

combat.service.spec.ts mocked CombatRewardService, so it never noticed
that design R8 removed CombatRewardDto.experience. Its mocks returned
{ experience, silver, items } and one assertion required experience: 8
back out -- encoding a contract the production DTO no longer has. A mock
lying about the real shape is worse than no test: it would keep passing
if the real DTO drifted further.

The rollback test deliberately wrote two independent fields so its
assertions could not pass vacuously ("rolled back" vs "never written").
Swapped the abolished experience for renown rather than dropping to a
single field, preserving that intent.

Monster level is untouched -- it is a monster stat this slice keeps, not
the abolished character level.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/api/src/combat/combat.service.spec.ts

@@ -173,8 +173,7 @@ function character(overrides: Partial<Character> = {}): Character {
   return {
     id: CHARACTER_ID,
     name: 'Aric Duskwalker',
-    level: 1,
-    experience: 0,
+    renown: 1,
     silver: 0,
     baseHp: 100,
     baseAttack: 6,
@@ -271,7 +270,7 @@ function fakeRewardService(
   return {
     grantVictoryRewards:
       overrides.grantVictoryRewards ??
-      jest.fn().mockResolvedValue({ experience: 8, silver: 6, items: [] }),
+      jest.fn().mockResolvedValue({ silver: 6, items: [] }),
     loadRewards: overrides.loadRewards ?? jest.fn().mockResolvedValue(null),
   } as unknown as CombatRewardService;
 }
@@ -836,7 +835,6 @@ describe('CombatService', () => {
       );
       const rewards = fakeRewardService({
         grantVictoryRewards: jest.fn().mockResolvedValue({
-          experience: 8,
           silver: 6,
           items: [],
         }),
@@ -856,7 +854,7 @@ describe('CombatService', () => {
       );
 
       expect(result.status).toBe(CombatStatus.WON);
-      expect(result.rewards).toEqual({ experience: 8, silver: 6, items: [] });
+      expect(result.rewards).toEqual({ silver: 6, items: [] });
       expect(rewards.grantVictoryRewards).toHaveBeenCalledTimes(1);
       // The reward service must receive the transaction manager, not the data
       // source: `expect.anything()` would pass even if the code handed over
@@ -914,7 +912,6 @@ describe('CombatService', () => {
 
     it('replays the persisted reward when a finished combat is read again', async () => {
       const persisted = {
-        experience: 16,
         silver: 12,
         items: [
           {
@@ -997,10 +994,12 @@ describe('CombatService', () => {
         new CombatEngineService(),
         fakeCharacterStats(),
         fakeRewardService({
-          // Genuinely write XP/silver through the transaction's manager
+          // Genuinely write renown/silver through the transaction's manager
           // before failing, so the assertions below prove the rollback
           // discards those writes rather than passing vacuously because
-          // nothing was ever written.
+          // nothing was ever written. Two independent fields, deliberately:
+          // one field alone could not distinguish "rolled back" from
+          // "never written".
           grantVictoryRewards: jest
             .fn()
             .mockImplementation(async (manager: EntityManager) => {
@@ -1009,7 +1008,7 @@ describe('CombatService', () => {
                 id: CHARACTER_ID,
               });
               if (combatCharacter) {
-                combatCharacter.experience += 8;
+                combatCharacter.renown += 1;
                 combatCharacter.silver += 6;
                 await characters.save(combatCharacter);
               }
@@ -1027,7 +1026,7 @@ describe('CombatService', () => {
       expect(dataSource.state.combats[0].status).toBe(CombatStatus.ACTIVE);
       expect(dataSource.state.combats[0].monsterCurrentHp).toBe(1);
       expect(dataSource.state.combatEvents).toHaveLength(0);
-      expect(dataSource.state.characters[0].experience).toBe(0);
+      expect(dataSource.state.characters[0].renown).toBe(1);
       expect(dataSource.state.characters[0].silver).toBe(0);
     });
   });