Remove unused nuzlocke rules, reorganize into core and playstyle

Remove firstEncounterOnly, permadeath, nicknameRequired, and
postGameCompletion from the rules system — they are either implicit
(it's a nuzlocke tracker) or not enforced. Move levelCaps to core
(it's displayed in the sticky bar). Create a new "playstyle" category
for hardcoreMode and setModeOnly — informational rules useful for
stats but not enforced by the tracker. Remove the completion category
entirely. Add sub-task beans for the rules overhaul epic.

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

.beans/nuzlocke-tracker-o7r8--remove-unused-nuzlocke-rules.md

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+---
+# nuzlocke-tracker-o7r8
+title: Remove unused nuzlocke rules
+status: completed
+type: feature
+priority: normal
+created_at: 2026-02-20T19:55:59Z
+updated_at: 2026-02-20T20:04:33Z
+parent: nuzlocke-tracker-49xj
+---
+
+Remove 5 rules that either define what a nuzlocke is (always true) or don't affect tracker behavior:
+- `firstEncounterOnly` — implicit; it's a nuzlocke tracker
+- `permadeath` — implicit; it's a nuzlocke tracker
+- `nicknameRequired` — not enforced or tracked
+- `setModeOnly` — not enforced or tracked
+- `postGameCompletion` — not enforced or tracked
+
+## Checklist
+
+- [x] Remove from `NuzlockeRules` interface and `DEFAULT_RULES`
+- [x] Remove their entries from `RULE_DEFINITIONS`
+- [x] Update `RulesConfiguration`, `RuleToggle`, and `RuleBadges` components as needed
+- [x] Update `NewRun.tsx` and `NewGenlocke.tsx` if they reference removed rules
+- [x] Verify backend encounter logic still works (uses `.get()` with defaults)
+- [x] Update backend test seed data if it references removed rules