docs: clarify LiveDictationController and DictationBridge status

Both classes are kept in v0.1.2 (they serve the in-app keyboard
preview and the one-shot host-app dictation handoff path), but
their primary role was taken over by FlowSessionManager +
FlowContinuousCapture in v0.1.1. Add a STATUS section to each
file header explaining the current role and listing the call
sites, so future readers do not assume they are dead code and
try to delete them (which would break PreviewASRController and
KeyboardPreviewSheet).

Refs: AUDIT_APPSTORE.md P0-3

OSGKeyboardShared/Services/DictationBridge.swift

@@ -5,6 +5,12 @@
 //   keyboard extension -> open host app for recording
 //   host app           -> writes final transcript
 //   keyboard extension -> consumes pending transcript and inserts text
+//
+// STATUS (v0.1.2): Retained. Consumed by `KeyboardViewController` for
+// the "one-shot" host-app dictation path (where the keyboard extension
+// launches the host app, the user records there, and the resulting
+// text is consumed back by the extension). The *continuous* path goes
+// through `FlowSessionBridge` + `FlowSessionManager` instead.
 
 import Foundation