Add post-game completion rule option

Add postGameCompletion toggle to nuzlocke rules so players can indicate
whether a run ends after the Champion or continues into post-game. Adds
a new "Completion" category section in rules configuration with a green
badge color.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-tyvc--add-end-of-run-condition-rule.md

@@ -1,10 +1,11 @@
 ---
 # nuzlocke-tracker-tyvc
 title: Add end-of-run condition rule
-status: todo
+status: completed
 type: feature
+priority: normal
 created_at: 2026-02-09T08:35:39Z
-updated_at: 2026-02-09T08:35:39Z
+updated_at: 2026-02-09T11:23:11Z
 ---
 
 Add a new nuzlocke rule: **End of Run Condition**. This is a toggle/switch that lets the player decide when a run is considered complete:
@@ -15,7 +16,7 @@ Add a new nuzlocke rule: **End of Run Condition**. This is a toggle/switch that
 This affects when the player is expected to mark a run as "completed" and could influence level caps and boss tracking in the future.
 
 ## Checklist
-- [ ] Add `postGameCompletion` (boolean, default false) to the `NuzlockeRules` TypeScript interface and `DEFAULT_RULES`
-- [ ] Add a rule definition to `RULE_DEFINITIONS` in `frontend/src/types/rules.ts`
-- [ ] Verify the rule appears in the `RulesConfiguration` component (should work automatically via RULE_DEFINITIONS)
-- [ ] Verify the rule is stored correctly via the existing run/genlocke creation flows (JSONB, no backend schema change needed)
+- [x] Add `postGameCompletion` (boolean, default false) to the `NuzlockeRules` TypeScript interface and `DEFAULT_RULES`
+- [x] Add a rule definition to `RULE_DEFINITIONS` in `frontend/src/types/rules.ts`
+- [x] Verify the rule appears in the `RulesConfiguration` component (added new "Completion" section)
+- [x] Verify the rule is stored correctly via the existing run/genlocke creation flows (JSONB, no backend schema change needed)