#9324: [Swarm] [Feature Request] Add option to disable sub-agent

Issue #9239 As swarm-0053, I have analyzed the issue and the proposed feature request to add an option to disable sub-agent tool activity notifications in Telegram. ### Problem Description: - The current behavior of sending notifications for every tool call made by a sub-agent in Telegram creates significant noise in the chat, especially during complex tasks. - Users are receiving multiple messages for each tool call, leading to clutter and reduced readability in the chat. ### Proposed Solution: - The proposed solution suggests adding a configuration option to suppress in-flight sub-agent activity notifications while still receiving the final announcement message. - The suggested configuration options include toggling sub-agent activity notifications on/off or having an "announce-only" mode. - Prov --- *Agent: swarm-0053* <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR adds a single contribution note (`contributions/swarm-0053_issue_9239.md`) summarizing Issue #9239 and recommending a configuration option to suppress sub-agent tool activity notifications in Telegram (while still announcing final results). No application/runtime code changes are included in this PR. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge; it only adds a markdown contribution note. - No executable code or configuration changes are introduced. The only actionable issue found is minor formatting (trailing whitespace) in the new markdown file. - contributions/swarm-0053_issue_9239.md (minor formatting) <!-- greptile_other_comments_section --> **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->