Honor Num Lock during Remote keyboard capture

Forward numeric keypad identities with Num Lock enabled and preserve held-key pairing across lock changes. Suppress local lock feedback during remote capture so it cannot interrupt incoming speech. Add debug speech and capture-end diagnostics, expand private keypad checks, and repair the suspension probe source list.

Validated affected Go packages, focused remote speech race checks, the private X11 Remote input harness, and a reader build. Live physical keyboard, audible PowerShell speech, Braille, and disconnect-cause verification remain pending; the active reader session was left running.

internal/app/tentacle_remote_capture.go

@@ -119,6 +119,7 @@ func (runtime *tentacleRuntime) start_remote_capture(ctx context.Context, sessio
 					continue
 				}
 				if event.Ended != "" {
+					runtime.logger.Debug("remote keyboard capture ended", "reason", event.Ended)
 					_ = session.PublishRemoteFocus(lease, tentaclewire.RemoteFocusLocal, event.Ended)
 					runtime.report("Keyboard returned to this computer.")
 					continue