fix(tmux): defer subagent attach until pane focus

src/shared/tmux/tmux-utils/pane-command.ts

@@ -0,0 +1,15 @@
+import { shellEscapeForDoubleQuotedCommand } from "../../shell-env"
+
+const TMUX_COMMAND_SHELL = "/bin/sh"
+
+export function buildTmuxAttachCommand(serverUrl: string, sessionId: string, directory: string): string {
+  const escapedUrl = shellEscapeForDoubleQuotedCommand(serverUrl)
+  const escapedSessionId = shellEscapeForDoubleQuotedCommand(sessionId)
+  const escapedDirectory = shellEscapeForDoubleQuotedCommand(directory || process.cwd())
+  return `${TMUX_COMMAND_SHELL} -c "opencode attach ${escapedUrl} --session ${escapedSessionId} --dir ${escapedDirectory}"`
+}
+
+export function buildTmuxPlaceholderCommand(description: string): string {
+  const escapedDescription = shellEscapeForDoubleQuotedCommand(description)
+  return `${TMUX_COMMAND_SHELL} -c "printf '%s\\n%s\\n' \"OMO subagent pane ready: ${escapedDescription}\" \"Focus this pane to attach.\"; exec tail -f /dev/null"`
+}