fix: bugs #238,#240,#244,#246 + docs #248 update

- #238: Fix spire tab inconsistent state (Max Floor 1 but Floors Cleared 0) by not inflating maxFloorReached on enterSpireMode and preserving it on exitSpireMode
- #240: Fix guardian armor display stray text by extracting stat formatters in SpireSummaryTab
- #244: Improve discipline auto-pause UX with log messages and visual feedback on DisciplineCard
- #246: Fix raw mana exceeding max cap by recomputing maxMana after discipline XP gains
- #248: Update AGENTS.md (remove gitea_get_project_boards, add gitea_start_session, 22 mana types, 8 stores, updated guardian tiers)
- #248: Update README.md (remove Prisma/SQLite refs, update mana types/guardian tiers/discipline counts)
- #248: Update GAME_BRIEFING.md (8 stores, 22 mana types, 64 disciplines, 8-tier guardians, correct code architecture)

src/lib/game/stores/combatStore.ts

@@ -153,7 +153,7 @@ export const useCombatStore = create<CombatStore>()(
       },
 
       exitSpireMode: () => {
-        set({
+        set((s) => ({
           spireMode: false,
           currentAction: 'meditate',
           climbDirection: null,
@@ -164,8 +164,9 @@ export const useCombatStore = create<CombatStore>()(
           currentRoom: generateFloorState(1),
           castProgress: 0,
           clearedFloors: {},
-          maxFloorReached: 0,
-        });
+          // Preserve maxFloorReached — don't reset to 0 on spire exit (fix #238)
+          maxFloorReached: Math.max(s.maxFloorReached, 1),
+        }));
       },
 
       startClimbUp: () => set({ climbDirection: 'up', currentAction: 'climb' }),
@@ -219,7 +220,7 @@ export const useCombatStore = create<CombatStore>()(
           climbDirection: null,
           isDescending: false,
           clearedFloors: {},
-          maxFloorReached: Math.max(s.maxFloorReached, s.currentFloor),
+          // Don't inflate maxFloorReached — it should reflect actual progress (fix #238)
         }));
       },