feat: add focus mode to reduce human interruption

[aalvii]

feat: add focus mode to reduce human interruption

Summary

• Add a new focusMode config option (default false, opt-in) to dsh-agent-teams.
• When enabled, the captain system prompt includes a Focus Protocol:
  • Ask the captain to notify the user only on completion, failure, or a decision that genuinely needs the user.
  • Ask the captain to keep the human-visible task list short and push background work to autonomous agents.
  • Ask the captain not to start extra deep tasks while agents are running, and to batch the final summary.
  • Ask the captain to mark blocked/needs-decision tasks once and wait.
• When focusMode: false, the previous always-report prompt behavior is preserved.

Motivation

Running multiple agents in parallel increases context-switching cost. This feature lets users keep AgentTeams running in the background without being interrupted by progress chatter, matching the “only notify on completion/failure/needs-decision” pattern from AI multitasking/focus guidance.

Scope / Limitation

• This is a prompt-level guideline, not a hard notification filter.
• It changes what the captain is instructed to do; a model may still surface important updates.
• A future follow-up could add a real delivery filter at the scheduler/mailbox layer.

Test Plan

• pnpm typecheck
• pnpm build
• pnpm verify (offline + lifecycle + stress)
• Manual config check: focusMode: true adds Focus Protocol to the system prompt section; focusMode: false keeps original text

Notes

• Default is false (opt-in) to preserve existing behavior.