Add Agent Computer delegation skills

Co-authored-by: Codex <noreply@openai.com>

skills/computer-acp/references/acp-flow.md

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+# ACP Flow
+
+The `computer acp serve` bridge is intended to feel like a local ACP agent command while proxying work to a remote machine agent.
+
+## Basic shape
+
+1. The local client starts `computer acp serve <machine> --agent <agent> --name <session>`.
+2. The bridge handles ACP initialization on stdin/stdout.
+3. The bridge maps ACP session operations onto Agent Computer session APIs.
+4. Remote session updates are streamed back as ACP `session/update` notifications.
+
+## Good commands
+
+```bash
+computer acp serve yinnar-south --agent claude --name review
+computer acp serve airport --agent claude --name debug
+```
+
+## Recommended client behavior
+
+- Reuse a stable session name when reconnecting.
+- Treat the bridge as the single local command for remote-agent interaction.
+- Use the normal `computer agent ...` commands outside ACP when you need manual inspection or cleanup.