feat(agent): redesign project_cli with module/method/input protocol

- Replace command/subcommand/args with module/method/input envelope
- Calendar handler uses discriminated union (mode) for read operations
- Strict Pydantic models with extra='forbid' for all calendar methods
- Worker max_iters=7, router prompt simplified (removed project_cli_defaults)
- Skill index cards + per-action files for progressive disclosure
- Frontend/AG-UI aligned to module/method dispatch
- Protocol docs updated to module/method/input contract

WIP: action cards need envelope fix, 2 tests need update, memory
handler needs Pydantic models.

apps/lib/features/chat/presentation/bloc/chat_bloc.dart

@@ -263,10 +263,10 @@ class ChatBloc extends Cubit<ChatState> implements ChatOrchestrator {
     if (args == null) {
       return false;
     }
-    final command = (args['command'] as String?)?.trim().toLowerCase();
-    final subcommand = (args['subcommand'] as String?)?.trim().toLowerCase();
-    const mutationSubcommands = {'create', 'update', 'delete'};
-    if (command != 'calendar' || !mutationSubcommands.contains(subcommand)) {
+    final skill = (args['skill'] as String?)?.trim().toLowerCase();
+    final action = (args['action'] as String?)?.trim().toLowerCase();
+    const mutationActions = {'create_event', 'update_event', 'delete_event'};
+    if (skill != 'calendar' || !mutationActions.contains(action)) {
       return false;
     }
     return status == 'success' || status == 'partial';