Add Agent Computer delegation skills

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

skills/computer-fleet/references/cli-cheatsheet.md

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+# CLI Cheatsheet
+
+## Authentication
+
+```bash
+computer whoami
+computer login
+```
+
+## Machine discovery
+
+```bash
+computer ls --json
+computer fleet status --json
+```
+
+## Agent discovery
+
+```bash
+computer agent agents <machine> --json
+```
+
+## Sessions
+
+```bash
+computer agent sessions list <machine> --json
+computer agent sessions new <machine> --agent claude --name review --json
+computer agent status <machine> --session <session_id> --json
+```
+
+## Prompting
+
+```bash
+computer agent prompt <machine> "inspect the repo and summarize the failing tests" --agent claude --name review
+computer agent prompt <machine> "continue from the previous task" --session <session_id>
+```
+
+## Streaming and control
+
+```bash
+computer agent watch <machine> --session <session_id>
+computer agent cancel <machine> --session <session_id> --json
+computer agent interrupt <machine> --session <session_id> --json
+computer agent close <machine> --session <session_id>
+```
+
+## Good defaults
+
+- Prefer machine handles over machine ids when both are available.
+- Prefer `--name` for human-meaningful persistent sessions.
+- Prefer `--json` when another program or agent needs to read the result.