refactor(mode-prompts): migrate team prompt

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/keyword-detector/team/default.ts

@@ -1,3 +1,5 @@
+import { TEAM_MODE_PROMPT } from "@oh-my-opencode/prompts-core"
+
 /**
  * Team mode keyword detector.
  *
@@ -7,5 +9,4 @@
 
 export const TEAM_PATTERN = /\bteam[\s_-]?mode\b/i
 
-export const TEAM_MESSAGE = `[team-mode]
-Team-mode reference detected. Orchestrate via team_* tools (team_create -> team_task_create + team_send_message); NEVER substitute with delegate_task — it is not equivalent. After every team_task_update that completes or fails a task, re-check team_task_list: if every task is terminal, run the closure sequence (team_shutdown_request + team_approve_shutdown per active member, then team_delete) in the same turn. Closing the team is the lead's responsibility, not the user's. If the team_* tools are absent, team_mode is disabled — tell the user to set team_mode.enabled=true and restart opencode.`
+export const TEAM_MESSAGE = TEAM_MODE_PROMPT