fix: terminal hangs, right arrow blocking, and runaway iris processes (#142)

closes #137

- right arrow consumed the escape sequence without forwarding it, so the
cursor couldn't move back right after moving left (60149a2)
- p10k's instant prompt redirects stdout to a temp file that exec iris
inherits, sending the overlay there instead of the terminal and looking
like a dead keyboard. Reopens /dev/tty when stdout isn't a terminal
(7ebbb0c)
- zsh/bash autostart lacked the interactivity check fish already had, so
agentic tools sourcing your rc file spawned a rogue iris that seized
/dev/tty (5fe58be)

root/wrapper.go

@@ -107,6 +107,17 @@ func writeStdout(data []byte) {
 	_, _ = os.Stdout.Write(data)
 }
 
+func restoreStdoutTTY() {
+	if term.IsTerminal(int(os.Stdout.Fd())) {
+		return
+	}
+	tty, err := os.OpenFile("/dev/tty", os.O_WRONLY, 0)
+	if err != nil {
+		return
+	}
+	os.Stdout = tty
+}
+
 // restoreTerminal restores the terminal state if needed
 func restoreTerminal() {
 	oldStateMu.Lock()
@@ -129,6 +140,8 @@ func syncProcessCWD(cwd string) {
 // it handles raw terminal mode to intercept keystrokes and
 // coordinates between the shell process and the suggestion overlay
 func runWrapper() {
+	restoreStdoutTTY()
+
 	var naiveBuffer string
 	var lastSubmittedCommand string
 	cursorOffset := 0
@@ -1057,6 +1070,7 @@ func runWrapper() {
 								}
 								continue
 							}
+							rawSeq := append([]byte(nil), inputSlice[i:i+navConsumed]...)
 							i += navConsumed - 1
 							intercepted = true
 							bufferMu.Lock()
@@ -1095,6 +1109,7 @@ func runWrapper() {
 								userNavigated.Store(false)
 							}
 							bufferMu.Unlock()
+							_, _ = ptmx.Write(rawSeq)
 							isLeftRightArrow = true
 						}
 					}