fix(cli): make clide draw reachable as an umbrella command (T-318)

draw is single-token (no verb), so `clide draw --file x` mis-parsed as cmd
"draw.--file" — the dispatcher registered draw but the argv parser never
learned it was umbrella (unlike icon/image which use subsystem.verb). Found
driving the live install; the handler unit tests bypassed the argv path so
they missed it. Added draw to _umbrellaCommands + a parse regression test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/src/cli/argv_to_request.dart

@@ -27,7 +27,7 @@ import 'package:clide/src/ipc/schema_v1.dart';
 /// split. Match the IDs the dispatcher exposes directly. `tail` and
 /// `events` are handled by the IPC server itself (streaming / cursor-pull
 /// event reads, T-129 / T-223) rather than the dispatcher.
-const Set<String> _umbrellaCommands = {'status', 'tail', 'events', 'version', 'ping', 'capabilities', 'instance'};
+const Set<String> _umbrellaCommands = {'status', 'tail', 'events', 'version', 'ping', 'capabilities', 'instance', 'draw'};
 
 /// Sealed result of translating argv. Caller (the IPC server, or the
 /// C client wrapper in T-126) handles either branch.