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/input/remote_capture.go

@@ -9,8 +9,8 @@ import "errors"
 var ErrRemoteCaptureChord = errors.New("remote capture local shortcut is invalid")
 
 // RemoteCaptureKey is one normalized captured transition. Symbol is the
-// group-zero, level-zero keysym the native owner resolved for a press, the
-// same form the command owner matches against bindings; releases and repeats are
+// group-zero, unshifted keysym the native owner resolved for a press, with
+// Num Lock selecting numeric keypad identities; releases and repeats are
 // matched by keycode, so a later layout change cannot alter ownership.
 type RemoteCaptureKey struct {
 	Keycode uint8
@@ -43,8 +43,8 @@ type RemoteCaptureTransition struct {
 // handled by the native owner without waiting for the network or a Tentacle.
 var RemoteCaptureEscape = CommandChord{Symbol: 0xffc8}
 
-// RemoteCaptureKeyName returns the canonical Remote key name for a
-// group-zero, level-zero keysym name, or "" when it has none.
+// RemoteCaptureKeyName returns the canonical Remote key name for an unshifted
+// keysym name (with Num Lock selecting keypad identities), or "" when it has none.
 func RemoteCaptureKeyName(keysym string) string {
 	switch keysym {
 	case "Prior":