rename: user-facing product name Shotdeck -> Redline; legacy PDFs still recognized

Sources/ShotdeckCore/Model/ShotdeckError.swift

@@ -16,7 +16,7 @@ public enum ShotdeckError: Error, LocalizedError, Sendable {
         case .screenRecordingNotGranted:
             return "Screen Recording is turned off. Grant it in System Settings to capture."
         case .noRegionRemembered:
-            return "No capture region is set. Choose 'Re-select area' from the Shotdeck menu."
+            return "No capture region is set. Choose 'Re-select area' from the Redline menu."
         case .displayNoLongerConnected:
             return "The display used for capture is no longer connected."
         case .captureFailed(let underlying):

Sources/ShotdeckCore/PDF/PDFComposer.swift

@@ -71,7 +71,7 @@ public struct PDFComposer: Sendable {
     }
 
     public static func fileName(for session: CaptureSession) -> String {
-        "Shotdeck-\(DubaiTime.fileStamp(session.createdAt)).pdf"
+        "Redline-\(DubaiTime.fileStamp(session.createdAt)).pdf"
     }
 
     private static func writePDF(
@@ -86,7 +86,7 @@ public struct PDFComposer: Sendable {
         }
 
         let auxiliaryInfo: [String: Any] = [
-            kCGPDFContextCreator as String: "Shotdeck",
+            kCGPDFContextCreator as String: "Redline",
             kCGPDFContextTitle as String: title,
             kCGPDFContextSubject as String: sessionID.uuidString.lowercased(),
         ]

Sources/ShotdeckCore/Returns/AnnotationInspector.swift

@@ -93,16 +93,19 @@ public enum AnnotationInspector {
         )
     }
 
-    /// True when this PDF was produced by Shotdeck. Creator attribute is authoritative;
+    /// True when this PDF was produced by this app. Creator attribute is authoritative;
     /// the filename fallback applies ONLY when the creator attribute is absent.
+    /// Accepts both the current product name ("Redline") and the legacy name ("Shotdeck")
+    /// so PDFs already on the iPad or in Downloads are still detected.
     public static func isShotdeckDocument(_ document: PDFDocument) -> Bool {
         if let creator = document.documentAttributes?[PDFDocumentAttribute.creatorAttribute] as? String {
-            return creator == "Shotdeck"          // present creator is authoritative, full stop
+            // Present creator is authoritative, full stop.
+            return creator == "Redline" || creator == "Shotdeck"
         }
         // Creator ABSENT (some apps rewrite metadata on save) -> filename fallback only here.
         guard let name = document.documentURL?.lastPathComponent else { return false }
         // .lastPathComponent on a file URL is already percent-decoded; do not use .absoluteString.
-        return name.wholeMatch(of: /^Shotdeck-\d{8}-\d{6}( \d+)?\.pdf$/) != nil
+        return name.wholeMatch(of: /^(Redline|Shotdeck)-\d{8}-\d{6}( \d+)?\.pdf$/) != nil
         // Case-sensitive by construction (Swift Regex literals are case-sensitive by default).
         // The optional "( \d+)?" is macOS's duplicate-name suffix AirDrop adds when a file of
         // the same name already exists in the watch folder — the normal case for a return.

Sources/ShotdeckCore/Returns/ReturnWatcher.swift

@@ -60,7 +60,7 @@ public actor ReturnWatcher {
     }
 
     /// Scans the watch folder once, immediately, without waiting for an event. Every
-    /// recognized, stable, openable Shotdeck PDF present is (re-)inspected and (re-)recorded
+    /// recognized, stable, openable Redline/Shotdeck PDF present is (re-)inspected and (re-)recorded
     /// into the ledger; returns exactly the documents processed in this call.
     @discardableResult
     public func scanNow() async throws -> [ReturnedDocument] {