fix(monsters): finish deleting experienceReward, column included

Design ruling R7 abolishes XP as a concept and says the column goes with
it, but no task in the plan actually dropped it -- the plan only dropped
characters.experience and combat_rewards.experience_granted. Task 9
removed experienceReward from the seed literals, leaving
monster_definitions.experience_reward as a NOT NULL column with no
default that nothing supplies. The first monster insert against a real
database would have failed on a constraint violation.

No suite here could have caught it: none of them connect to Postgres.

Drops the column in the slice migration (which has never been run, so
amending it in place is correct rather than stacking a second one),
removes the entity field, and clears the three test fixtures that still
set it. silver_min/silver_max deliberately stay -- spec 15 keeps a
direct currency drop available as a lore-valid exception, and XP has no
such carve-out.

Also retargets the seed idempotency test off renown: 1, which is the
seed's own default and so could not distinguish "preserved" from
"reset to default".

NOTE ON SCOPE: this commit also absorbs a Prettier reformatting pass
that was already sitting uncommitted in the working tree, which is why
it touches ~59 files. That churn is purely cosmetic line-rewrapping --
verified by inspection, and the suite is green at 267/267 with the build
at exactly the 3 expected errors owned by Tasks 10 and 11. The repo is
not Prettier-clean at baseline (119 files still flagged), so this was a
partial run by an earlier step, not a deliberate repo-wide format.

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

apps/api/src/world/local-location-interaction.spec.ts

@@ -115,9 +115,7 @@ describe('WorldService.runLocalInteraction', () => {
   });
 
   it('settles travel before resolving which location the character stands at', async () => {
-    const completeTravelIfDue = jest
-      .fn()
-      .mockResolvedValue({ status: 'IDLE' });
+    const completeTravelIfDue = jest.fn().mockResolvedValue({ status: 'IDLE' });
     const service = createService(
       location(BURNED_ROAD_ID, BURNED_ROAD_POIS),
       completeTravelIfDue,
@@ -155,6 +153,8 @@ describe('WorldService.runLocalInteraction', () => {
   it('rejects a navigation hotspot that has no result to reveal', async () => {
     const service = createService(location(BURNED_ROAD_ID, BURNED_ROAD_POIS));
 
-    await expectRejected(service.runLocalInteraction(CHARACTER_ID, 'hunt-area'));
+    await expectRejected(
+      service.runLocalInteraction(CHARACTER_ID, 'hunt-area'),
+    );
   });
 });