feature: sent-PDF history (10) + image retention (30) with pruning per Ben's 2026-09-02 ruling

Sources/Shotdeck/AppModel.swift

@@ -52,6 +52,7 @@ public final class AppModel {
     let picker: RegionPickerController
     let ledger: ReturnLedger
     let watcher: ReturnWatcher
+    let historyStore: HistoryStore
     let updateChecker: UpdateChecker
 
     public init(
@@ -63,7 +64,7 @@ public final class AppModel {
         picker: RegionPickerController,
         ledger: ReturnLedger,
         watcher: ReturnWatcher
-    ) {
+    ) throws {
         self.paths = paths
         self.spool = spool
         self.composer = composer
@@ -72,6 +73,7 @@ public final class AppModel {
         self.picker = picker
         self.ledger = ledger
         self.watcher = watcher
+        self.historyStore = try HistoryStore(paths: paths)
         self.session = CaptureSession(
             id: UUID(),
             createdAt: Date(),
@@ -208,6 +210,7 @@ public final class AppModel {
             ProcessInfo.processInfo.environment["SHOTDECK_PICKER_SELFTEST"] != nil
             || ProcessInfo.processInfo.environment["SHOTDECK_SNAPSHOT_DIR"] != nil
             || ProcessInfo.processInfo.environment["SHOTDECK_UPDATE_SELFTEST"] != nil
+            || ProcessInfo.processInfo.environment["SHOTDECK_HISTORY_SELFTEST"] != nil
         if !skipSchedule {
             updateChecker.startSchedule()
         }