Link to /automation/tasks from all pages that mention subagent runs,
ACP runs, or detached background work:
- tools/subagents.md: note that each sub-agent run is tracked as a background task
- tools/acp-agents.md: note that ACP session spawns are tracked as background tasks
- cli/index.md: link tasks section to doc page, add tasks audit subcommand
- concepts/queue.md: note that detached lane runs are tracked as background tasks
- gateway/configuration-reference.md: cron section cross-ref to tasks
- help/faq.md: add tasks link to sub-agent offloading FAQ answer
