Add the plugin's Stop hook so a written-down wait is never left unwatched (issue 1743)

A session could end its turn while a wait it wrote down with
claude_code_wait had nothing following it. The plugin's Stop hook
(claude-code stop <waits-dir>) refuses the stop while a wait is within
its bound and unwatched, or past its bound and not said, reading the
waits file directly with no network and a 5s bound; it fails open on a
missing or malformed file or a panic, and lets a wait through after
three refusals in a row rather than holding the session forever.
Renames TestThePluginsOnlyHookIsTheGuard to cover the session-start and
Stop hooks too.

modules/claude-code/cmd/claude-code/main.go

@@ -421,6 +421,11 @@ func main() {
 	if len(os.Args) == 3 && os.Args[1] == "session-start" {
 		os.Exit(runSessionStart(os.Args[2], os.Stdin, os.Stdout))
 	}
+	// The plugin's Stop hook (novox/hq ADR 0489 §3-§6, issue 1743): keeps the turn open while a wait is unwatched
+	// or untold.
+	if len(os.Args) == 3 && os.Args[1] == "stop" {
+		os.Exit(runStop(os.Args[2], os.Stdin, os.Stderr))
+	}
 	// The helper that touches the agent's home as the agent's account (novox/hq ADR 0266), started by this
 	// module through sudo: one answer per request on stdin, until it ends.
 	if len(os.Args) == 2 && os.Args[1] == HelperArg {