Add Remote Braille IPC to the host and both SDKs

remote.braille requests and events carry a typed op under a
braille-stream lease: the controller's width and gestures for a
controlled reader, rendered cells back to its child, and cells, local
geometry and display gestures for a controller. Direction is validated
per role; a full mailbox revokes the lease. No display owner is
attached yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sdk/go/tentacle/remote_braille.go

@@ -0,0 +1,16 @@
+// Copyright (c) 2026 Storm Dragon
+// Authors: Storm Dragon, Angus Kola
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package tentacle
+
+import "git.stormux.org/storm/cthulhu/internal/tentaclewire"
+
+type RemoteBraille = tentaclewire.RemoteBraille
+type RemoteBrailleRequest = tentaclewire.RemoteBrailleRequest
+
+func ValidRemoteBraille(value RemoteBraille) bool { return tentaclewire.ValidRemoteBraille(value) }
+
+func ValidRemoteBrailleRequest(request RemoteBrailleRequest) bool {
+	return tentaclewire.ValidRemoteBrailleRequest(request)
+}