feat: post-prestige automation (auto-adventurer) (#76)

## Summary

Closes #61

- Adds the **Autonomous Recruitment** prestige upgrade (50 runestones) to both the API and web data files
- Adds `autoAdventurer?: boolean` to the `GameState` type for backwards-compatible saves
- Adds tick-loop logic in GameContext that automatically purchases the highest-tier unlocked adventurer the player can afford each frame when the toggle is enabled
- Adds `toggleAutoAdventurer` callback and exposes it through the context
- Adds toggle UI in the Prestige Shop (mirrors the existing Auto-Prestige toggle pattern)
- Updates the How to Play guide in the About panel to document the new automation feature

✨ This issue was created with help from Hikari~ 🌸

Reviewed-on: #76
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

apps/api/src/data/prestigeUpgrades.ts

@@ -210,6 +210,15 @@ export const defaultPrestigeUpgrades: Array<PrestigeUpgrade> = [
     runestonesCost: 1200,
   },
   // ── Utility Unlocks ───────────────────────────────────────────────────────
+  {
+    category: "utility",
+    description:
+      "Unlock the Auto-Adventurer toggle. When enabled, the tick engine will automatically purchase the highest-tier adventurer you can currently afford.",
+    id:             "auto_adventurer",
+    multiplier:     1,
+    name:           "Autonomous Recruitment",
+    runestonesCost: 50,
+  },
   {
     category: "utility",
     description:

apps/web/src/components/game/aboutPanel.tsx

@@ -188,14 +188,16 @@ const howToPlay = [
   },
   {
     body:
-      "Toggle automation in the Quests and Boss Encounters panels! Auto-Quest"
-      + " automatically sends your party on the highest-zone available quest"
-      + " as soon as one completes, skipping quests whose combat power"
-      + " requirement isn't met. Auto-Boss automatically challenges the"
-      + " highest available boss as soon as one is ready. Both can be toggled"
-      + " on or off at any time using the 🤖 Auto button in each panel"
-      + " header.",
-    title: "🤖 Auto-Quest & Auto-Boss",
+      "Toggle automation in the Quests, Boss Encounters, and Prestige Shop"
+      + " panels! Auto-Quest automatically sends your party on the"
+      + " highest-zone available quest as soon as one completes, skipping"
+      + " quests whose combat power requirement isn't met. Auto-Boss"
+      + " automatically challenges the highest available boss as soon as one"
+      + " is ready. Auto-Adventurer (unlocked via the Prestige Shop for 50"
+      + " runestones) automatically purchases the highest-tier adventurer you"
+      + " can currently afford each tick, keeping your income growing after a"
+      + " prestige without any manual clicks.",
+    title: "🤖 Auto-Quest, Auto-Boss & Auto-Adventurer",
   },
   {
     body:

apps/web/src/components/game/prestigePanel.tsx

@@ -89,6 +89,7 @@ const PrestigePanel = (): JSX.Element => {
     buyPrestigeUpgrade,
     enableNotifications,
     enableSounds,
+    toggleAutoAdventurer,
     toggleAutoPrestige,
     triggerPrestigeToast,
   } = useGame();
@@ -110,7 +111,7 @@ const PrestigePanel = (): JSX.Element => {
     );
   }
 
-  const { prestige: prestigeData, player } = state;
+  const { autoAdventurer, prestige: prestigeData, player } = state;
   const threshold = calculateThreshold(prestigeData.count);
   const isEligible = player.totalGoldEarned >= threshold;
   const runestonePreview = calculateRunestonePreview(
@@ -173,6 +174,10 @@ const PrestigePanel = (): JSX.Element => {
     void handlePrestige();
   }
 
+  function handleAutoAdventurerToggle(): void {
+    toggleAutoAdventurer();
+  }
+
   function handleAutoPrestigeToggle(): void {
     toggleAutoPrestige();
   }
@@ -347,6 +352,9 @@ const PrestigePanel = (): JSX.Element => {
                       = prestigeData.runestones >= upgrade.runestonesCost;
                     const isLoading = buyingId === upgrade.id;
 
+                    const isAutoAdventurerToggle
+                      = upgrade.id === "auto_adventurer" && purchased;
+                    const autoAdventurerEnabled = autoAdventurer ?? false;
                     const isAutoPrestigeToggle
                       = upgrade.id === "auto_prestige" && purchased;
                     const autoPrestigeEnabled
@@ -381,6 +389,21 @@ const PrestigePanel = (): JSX.Element => {
                               : `🔮 ${formatNumber(upgrade.runestonesCost)} Runestones`}
                           </p>
                         </div>
+                        {isAutoAdventurerToggle
+                          ? <button
+                            className={`auto-prestige-toggle ${
+                              autoAdventurerEnabled
+                                ? "enabled"
+                                : "disabled"
+                            }`}
+                            onClick={handleAutoAdventurerToggle}
+                            type="button"
+                          >
+                            {autoAdventurerEnabled
+                              ? "⚡ Auto ON"
+                              : "⏸ Auto OFF"}
+                          </button>
+                          : null}
                         {isAutoPrestigeToggle
                           ? <button
                             className={`auto-prestige-toggle ${

apps/web/src/context/gameContext.tsx

@@ -447,6 +447,11 @@ interface GameContextValue {
    */
   toggleAutoBoss: ()=> void;
 
+  /**
+   * Toggle the auto-adventurer setting on/off (requires auto_adventurer prestige upgrade).
+   */
+  toggleAutoAdventurer: ()=> void;
+
   /**
    * Queue of newly unlocked codex entry IDs (for toast notifications).
    */
@@ -1073,6 +1078,42 @@ export const GameProvider = ({
           }
         }
 
+        // Auto-adventurer: buy one of the highest-tier affordable unlocked adventurer per tick
+        if (
+          next.autoAdventurer === true
+          && next.prestige.purchasedUpgradeIds.includes("auto_adventurer")
+        ) {
+          const [ bestAdventurer ] = next.adventurers.
+            filter((adventurer) => {
+              const cost
+                = adventurer.baseCost * Math.pow(1.15, adventurer.count);
+              return adventurer.unlocked && next.resources.gold >= cost;
+            }).
+            sort((adventurerA, adventurerB) => {
+              const costA
+                = adventurerA.baseCost * Math.pow(1.15, adventurerA.count);
+              const costB
+                = adventurerB.baseCost * Math.pow(1.15, adventurerB.count);
+              return costB - costA;
+            });
+          if (bestAdventurer !== undefined) {
+            const purchaseCost
+              = bestAdventurer.baseCost * Math.pow(1.15, bestAdventurer.count);
+            next = {
+              ...next,
+              adventurers: next.adventurers.map((adventurer) => {
+                return adventurer.id === bestAdventurer.id
+                  ? { ...adventurer, count: adventurer.count + 1 }
+                  : adventurer;
+              }),
+              resources: {
+                ...next.resources,
+                gold: next.resources.gold - purchaseCost,
+              },
+            };
+          }
+        }
+
         // Detect newly unlocked achievements
         unlockedAchievementsReference.current = next.achievements.filter(
           (a, index) => {
@@ -1858,6 +1899,18 @@ export const GameProvider = ({
     });
   }, []);
 
+  const toggleAutoAdventurer = useCallback(() => {
+    setState((previous) => {
+      if (previous === null) {
+        return previous;
+      }
+      return {
+        ...previous,
+        autoAdventurer: previous.autoAdventurer !== true,
+      };
+    });
+  }, []);
+
   const setActiveCompanion = useCallback((companionId: string | null) => {
     setState((previous) => {
       if (previous === null) {
@@ -2169,6 +2222,7 @@ export const GameProvider = ({
       startQuest,
       state,
       syncError,
+      toggleAutoAdventurer,
       toggleAutoBoss,
       toggleAutoPrestige,
       toggleAutoQuest,
@@ -2240,6 +2294,7 @@ export const GameProvider = ({
     startQuest,
     state,
     syncError,
+    toggleAutoAdventurer,
     toggleAutoBoss,
     toggleAutoPrestige,
     toggleAutoQuest,

apps/web/src/data/prestigeUpgrades.ts

@@ -212,6 +212,15 @@ export const PRESTIGE_UPGRADES: Array<PrestigeUpgrade> = [
     runestonesCost: 1200,
   },
   // ── Utility Unlocks ───────────────────────────────────────────────────────
+  {
+    category: "utility",
+    description:
+      "Unlock the Auto-Adventurer toggle. When enabled, the tick engine will automatically purchase the highest-tier adventurer you can currently afford.",
+    id:             "auto_adventurer",
+    multiplier:     1,
+    name:           "Autonomous Recruitment",
+    runestonesCost: 50,
+  },
   {
     category: "utility",
     description:

packages/types/src/interfaces/gameState.ts

@@ -79,6 +79,11 @@ interface GameState {
    */
   autoBoss?: boolean;
 
+  /**
+   * When true, the tick engine automatically purchases the highest-tier affordable adventurer.
+   */
+  autoAdventurer?: boolean;
+
   /**
    * Companion unlock and active selection state — optional for backwards compatibility.
    */