Prune redundant reserve drill assignments

scripts/verify-campaign-save-normalization.mjs

@@ -36,6 +36,7 @@ try {
     normalizeCampaignSortieItemAssignments,
     resetCampaignState,
     setCampaignState,
+    setCampaignReserveTrainingFocus,
     setCampaignReserveTrainingAssignment,
     setFirstBattleReport
   } = await server.ssrLoadModule('/src/game/state/campaignState.ts');
@@ -155,6 +156,32 @@ try {
       clearedReserveDrill.reserveTrainingAssignments['liu-bei'] === undefined,
     `Expected reserve drill assignment API to trim, filter, and clear per-officer focus ids: ${JSON.stringify({ assignedReserveDrill, ignoredReserveDrill, clearedReserveDrill })}`
   );
+  storage.clear();
+  storage.set(
+    campaignStorageKey,
+    JSON.stringify({
+      version: 1,
+      updatedAt: '2026-07-03T11:35:00.000Z',
+      step: 'third-camp',
+      roster: [
+        { id: 'liu-bei', name: 'Liu Bei', faction: 'ally' },
+        { id: 'guan-yu', name: 'Guan Yu', faction: 'ally' }
+      ],
+      reserveTrainingFocus: 'balanced',
+      reserveTrainingAssignments: {
+        'liu-bei': 'bond-practice',
+        'guan-yu': 'class-practice'
+      }
+    })
+  );
+  loadCampaignState();
+  const dedupedReserveDrill = setCampaignReserveTrainingFocus('bond-practice');
+  assert(
+    dedupedReserveDrill.reserveTrainingFocus === 'bond-practice' &&
+      dedupedReserveDrill.reserveTrainingAssignments['liu-bei'] === undefined &&
+      dedupedReserveDrill.reserveTrainingAssignments['guan-yu'] === 'class-practice',
+    `Expected global reserve drill focus changes to remove redundant individual assignments: ${JSON.stringify(dedupedReserveDrill.reserveTrainingAssignments)}`
+  );
 
   resetCampaignState();
   const firstScenario = battleScenarios['first-battle-zhuo-commandery'];

src/game/state/campaignState.ts

@@ -622,7 +622,14 @@ export function markCampaignStep(step: CampaignStep) {
 
 export function setCampaignReserveTrainingFocus(focusId: CampaignReserveTrainingFocusId) {
   const state = ensureCampaignState();
-  state.reserveTrainingFocus = normalizeReserveTrainingFocusId(focusId);
+  const normalizedFocusId = normalizeReserveTrainingFocusId(focusId);
+  const rosterUnitIds = normalizedRosterUnitIds(state.roster);
+  const allowedUnitIds = rosterUnitIds.size > 0 ? rosterUnitIds : undefined;
+  const assignments = normalizeCampaignReserveTrainingAssignments(state.reserveTrainingAssignments, allowedUnitIds);
+  state.reserveTrainingFocus = normalizedFocusId;
+  state.reserveTrainingAssignments = Object.fromEntries(
+    Object.entries(assignments).filter(([, assignedFocusId]) => assignedFocusId !== normalizedFocusId)
+  ) as CampaignReserveTrainingAssignments;
   state.updatedAt = new Date().toISOString();
   persistCampaignState(state);
   return cloneCampaignState(state);