feat(keyboard): add clipboard voice command mode

Long-press mic runs ASR as an instruction over eligible clipboard text,
with host-confirm recording UI, min-record gate, and light ASR prewarm.
Bump CURRENT_PROJECT_VERSION to 53.

OSGKeyboardExt/Services/ClipboardPasteboardReader.swift

@@ -0,0 +1,17 @@
+// ClipboardPasteboardReader.swift
+// OSGKeyboard · Keyboard Extension
+//
+// Opportunity-read of UIPasteboard for clipboard-command eligibility.
+
+import UIKit
+import OSGKeyboardShared
+
+enum ClipboardPasteboardReader {
+    static func sample() -> (changeCount: Int, text: String?) {
+        let board = UIPasteboard.general
+        let changeCount = board.changeCount
+        // Prefer plain strings; avoid forcing non-text pasteboard items.
+        let text = board.hasStrings ? board.string : nil
+        return (changeCount, text)
+    }
+}