fix(ipad): ship iPad P0 layout/globe fixes, edit-last-input, drop clipboard commands

Adapt typing/voice surfaces for iPad width and height, add the system globe
key and last-input editing flow, harden host-only Rime deployment, and remove
clipboard voice commands. Bump build to 61.

OSGKeyboardShared/Services/FlowStartTransactionPolicy.swift

@@ -0,0 +1,39 @@
+// FlowStartTransactionPolicy.swift
+// OSGKeyboard · Shared
+//
+// Pure gate for exactly-once side effects over at-least-once Flow commands.
+
+import Foundation
+
+public enum FlowHostUtteranceState: Equatable, Sendable {
+    case idle
+    case starting(UUID)
+    case recording(UUID)
+    case processing(UUID)
+}
+
+public enum FlowStartDecision: Equatable, Sendable {
+    case accept
+    case idempotent
+    case rejectBusy
+    case rejectExpired
+}
+
+public enum FlowStartTransactionPolicy {
+    public static func decide(
+        incomingUtteranceID: UUID,
+        deadlineAt: TimeInterval?,
+        now: TimeInterval = Date().timeIntervalSince1970,
+        hostState: FlowHostUtteranceState
+    ) -> FlowStartDecision {
+        if let deadlineAt, now >= deadlineAt {
+            return .rejectExpired
+        }
+        switch hostState {
+        case .idle:
+            return .accept
+        case .starting(let id), .recording(let id), .processing(let id):
+            return id == incomingUtteranceID ? .idempotent : .rejectBusy
+        }
+    }
+}