feat(keyboard): improve typing, voice flow, and polish reliability

Reduce extension memory pressure and delivery races while adding richer candidates, tactile feedback, and safer two-level creative polishing.

OSGKeyboardShared/Utilities/OSGDiag.swift

@@ -0,0 +1,44 @@
+// OSGDiag.swift
+// OSGKeyboard · Shared
+//
+// Always-on diagnostic breadcrumbs. Uses NSLog so lines show up in Xcode /
+// Console without needing an os.Logger subsystem filter (keyboard extension
+// OSLog lines are easy to miss when the host process is selected).
+
+import Foundation
+import Darwin
+
+public enum OSGDiag {
+    /// Prefix every line for easy Console search: `OSGDiag`
+    public static func log(_ message: String, category: String = "diag") {
+        let line = "[OSGDiag/\(category)] \(message)"
+        NSLog("%@", line)
+        switch category {
+        case "keyboardExt", "boot":
+            OSGLog.keyboardExt.info("\(line, privacy: .public)")
+        case "flow", "asr":
+            OSGLog.flow.info("\(line, privacy: .public)")
+        default:
+            OSGLog.config.info("\(line, privacy: .public)")
+        }
+    }
+
+    /// Resident set size in MiB, or -1 if unavailable.
+    public static func memoryMB() -> Double {
+        var info = mach_task_basic_info()
+        var count = mach_msg_type_number_t(
+            MemoryLayout<mach_task_basic_info>.size / MemoryLayout<natural_t>.size
+        )
+        let kr = withUnsafeMutablePointer(to: &info) { ptr in
+            ptr.withMemoryRebound(to: integer_t.self, capacity: Int(count)) { rebound in
+                task_info(mach_task_self_, task_flavor_t(MACH_TASK_BASIC_INFO), rebound, &count)
+            }
+        }
+        guard kr == KERN_SUCCESS else { return -1 }
+        return Double(info.resident_size) / 1_048_576.0
+    }
+
+    public static func memoryTag() -> String {
+        String(format: "rss=%.1fMB", memoryMB())
+    }
+}