fix: Windows daemon survives session jobs; quieter wrap note; correct mute error

Verified on a Windows 11 VM over WinRM: doctor, SAPI synthesis, Edge,
oto/WASAPI playback, autostart, mute file, wrap exit codes, doctor --probe
and toast mode all work. Three findings fixed:

- The autostarted daemon died with the WinRM shell: Windows session hosts
  (WinRM, SSH, CI runners) put children into a job object that is
  terminated with the session. Spawn now starts the daemon with
  CREATE_BREAKAWAY_FROM_JOB first and falls back to a start without it when
  the job forbids breakaway. Confirmed: the daemon now outlives the WinRM
  shell and `talk daemon stop` still ends it.
- `talk mute` without a daemon printed "daemon call failed (<nil>)": the
  outer err was reported instead of the call's. Now "no daemon (<reason>);
  writing the mute file directly".
- `talk wrap` printed "command did not exit cleanly" for every non-zero
  exit code. The note is now reserved for commands that produced no exit
  code of their own (not found, signal); a plain failure is carried by the
  announcement and the exit code alone.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/daemon/spawn_windows.go

@@ -11,10 +11,18 @@ import (
 // binding to the caller's console.
 const detachedProcess = 0x00000008
 
+// createBreakawayFromJob is the Win32 flag CREATE_BREAKAWAY_FROM_JOB: the
+// child leaves the parent's job object, so a session-bound job (WinRM, SSH,
+// CI) does not take the daemon down with it. Only works when the job allows
+// it; Spawn falls back to a start without the flag otherwise.
+const createBreakawayFromJob = 0x01000000
+
 // detach detaches the child from the console: own process group (no Ctrl-C
 // from the shell) and no console (no flashing window).
-func detach(cmd *exec.Cmd) {
-	cmd.SysProcAttr = &syscall.SysProcAttr{
-		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP | detachedProcess,
+func detach(cmd *exec.Cmd, breakaway bool) {
+	flags := uint32(syscall.CREATE_NEW_PROCESS_GROUP | detachedProcess)
+	if breakaway {
+		flags |= createBreakawayFromJob
 	}
+	cmd.SysProcAttr = &syscall.SysProcAttr{CreationFlags: flags}
 }