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/database/seeds/vertical-slice.seed.spec.ts

@@ -129,7 +129,10 @@ describe('seedVisibleVerticalSlice', () => {
     Object.assign(characterRepository.rows[0], {
       currentLocationId: BURNED_ROAD_ID,
       currentHp: 57,
-      renown: 1,
+      // Deliberately NOT the seed default of 1: if a re-seed clobbered player
+      // state back to defaults, an assertion on the default value could not
+      // tell the difference.
+      renown: 5,
     });
     await seedVisibleVerticalSlice(dataSource);
 
@@ -168,7 +171,7 @@ describe('seedVisibleVerticalSlice', () => {
       expect.objectContaining({
         currentLocationId: BURNED_ROAD_ID,
         currentHp: 57,
-        renown: 1,
+        renown: 5,
       }),
     );