feat(askcli): add watch subcommand

Implements `ask watch [subcommand...]` which re-runs a read-only
subcommand every 2 seconds and redraws output when it changes,
similar to gnu-watch.

Safety features:
- Restricted to read-only subcommands (list, all, ready, info,
  urgency, help, dep list)
- Recursive watch is blocked
- Captures stderr so error messages are visible in the watched display

Also adds readOnly field to commandEntry registry for maintainability.

1 files changed, 1 insertions, 1 deletions

diff --git a/internal/askcli/dispatch_test.go b/internal/askcli/dispatch_test.go
index 20062b0..986b5e1 100644
--- a/internal/askcli/dispatch_test.go
+++ b/internal/askcli/dispatch_test.go
@@ -203,7 +203,7 @@ func TestDispatcher_LongHelp(t *testing.T) {
 	var stdout bytes.Buffer
 	d.Dispatch(context.Background(), []string{"help"}, nil, &stdout, io.Discard)
 	output := stdout.String()
-	for _, sub := range []string{"add", "list", "all", "ready", "info", "annotate", "start", "stop", "done", "priority", "tag", "dep", "urgency", "modify", "denotate", "delete", "fish"} {
+	for _, sub := range []string{"add", "list", "all", "ready", "info", "annotate", "start", "stop", "done", "priority", "tag", "dep", "urgency", "watch", "modify", "denotate", "delete", "fish"} {
 		if !strings.Contains(output, "ask "+sub) {
 			t.Errorf("help missing subcommand: ask %s", sub)
 		}