Add independent Remote input helper with EOF and watchdog cleanup

docs/tentacle-remote-keyboard.md

@@ -109,10 +109,12 @@ contract. None of these tests injects a desktop key.
 An unconnected [destination-key prerequisite](testing/remote-key-target.md) now
 retains native codes through layout changes and uncertain effects, with a
 quarantined Xorg resolver/backend. It is not attached to this mailbox and supplies
-no independent process/watchdog cleanup or physical collision guarantee.
+no physical collision guarantee. A subsequent [source-built helper](testing/remote-input-helper.md)
+now supplies private process-lifetime/EOF/watchdog cleanup, but no production
+reader launch or mailbox owner is attached.
 
-No capture event API, production Xorg input owner, independent native cleanup
-helper, core escape/bypass integration or installed Remote keyboard command is
+No capture event API, production Xorg input owner, supervised helper attachment,
+core escape/bypass integration or installed Remote keyboard command is
 provided. Physical-source approval, physical collision/recovery, audible speech,
 Braille and real NVDA/Orca interoperability remain unverified. Private IPC and
 relay checks close no live release gate.