fix(opencode): wait for bootstrap compose stack on update

[patil2001]

Summary

cmd_update recreated the compose stack without the readiness wait that cmd_start and cmd_restart already perform, so an update could race the bootstrap compose stack coming up. This adds macos_wait_for_bootstrap_compose_safe "update" || return 1 ahead of the force-recreate, mirroring the existing guard pattern.

AI Assistance

AI-assisted repository exploration and regression triage. The author reviewed the implementation, selected the validation scope, and is responsible for the final diff.

Release Lane

• Stable hotfix targeting release/2.6.x
• Mainline change targeting main
• Next-minor work targeting the next feature/minor release
• Not sure; reviewer should help classify

Stable hotfix reason:

Not targeting the stable release branch directly.

Changed Surface

• macOS update flow
• bootstrap compose wait
• Windows
• Linux
• renderer
• config

Validation

• bash -n on modified script
• focused single-file diff