fix: resolve critical bugs - disciplines, debug reset, floating point, spire loop

Fixes:
- Issue 193: Remove unnecessary useEffect that set activeTab when spireMode is true, and redundant setAction('climb') in SpireCombatPage
- Issue 194: Fix signed_pact prerequisite check in checkDisciplinePrerequisites by accepting signedPacts param; add 'At Limit' feedback on discipline button when concurrent limit reached
- Issue 195: Add resetDisciplines(), resetAttunements(), resetCrafting() calls to createResetGame; add resetCrafting action to crafting store
- Issue 196: Fix floating point display in ElementStatsSection (mana pools) and GameStateDebug (time); fix duplicate 'Base Regen' label in ManaStatsSection

All 917 tests pass. Files stay under 400-line limit.

src/lib/game/utils/discipline-math.ts

@@ -117,6 +117,7 @@ export function checkDisciplinePrerequisites(
   allDisciplines: Record<string, DisciplineState>,
   allDefinitions: DisciplineDefinition[],
   elements?: Record<string, { unlocked: boolean }>,
+  signedPacts?: number[],
 ): { canProceed: boolean; missingPrereqs: string[] } {
   if (!discipline.requires || discipline.requires.length === 0) {
     return { canProceed: true, missingPrereqs: [] };
@@ -127,7 +128,9 @@ export function checkDisciplinePrerequisites(
   for (const reqId of discipline.requires) {
     // Special case: 'signed_pact' requires at least one guardian pact
     if (reqId === 'signed_pact') {
-      missingPrereqs.push('Signed guardian pact');
+      if (!signedPacts || signedPacts.length === 0) {
+        missingPrereqs.push('Signed guardian pact');
+      }
       continue;
     }