fix(mcp): pass --mcp-config to coordinator agent on spawn

The mcpConfigPath was stored on the task but never forwarded as a
CLI argument, so the coordinator agent had no MCP tools available
and fell back to bash-based orchestration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brooksc

electron/preload.cjs

@@ -126,6 +126,7 @@ const ALLOWED_CHANNELS = new Set([
   'mcp_task_created',
   'mcp_task_closed',
   'mcp_task_state_sync',
+  'mcp_control_changed',
 ]);
 
 function isAllowedChannel(channel) {

src/components/TaskAITerminal.tsx

@@ -221,6 +221,9 @@ export function TaskAITerminal(props: TaskAITerminalProps) {
                       ...(props.task.skipPermissions && a().def.skip_permissions_args?.length
                         ? (a().def.skip_permissions_args ?? [])
                         : []),
+                      ...(props.task.mcpConfigPath
+                        ? ['--mcp-config', props.task.mcpConfigPath]
+                        : []),
                     ]}
                     cwd={props.task.worktreePath}
                     stepsEnabled={props.task.stepsEnabled}