Let the coordinator and workspace admins hand over tasks and routines

delegate_task takes a task_id to hand over a task already on a list: it
moves to the worker (a workspace's task stays on its list), goes to
doing, and the job is linked back so its end is noted on the task.
hand_over_schedule moves a bot's own routine to another bot, keeping its
workspace. Users get Hand over in the Tasks UI and both routine lists.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/types/index.ts

@@ -89,6 +89,14 @@ export type BotWithLastMessage = BotWithFace & {
  * A bot's schedule with what the routines page shows beside it: the bot
  * and the workspace it runs in.
  */
+/**
+ * A bot a task or routine can be handed over to, for the picker.
+ */
+export type HandOverTarget = {
+    id: number;
+    name: string;
+};
+
 export type CronJobWithNames = BUN_SQLITE_COBBLE_CRON_JOBS & {
     bot_name?: string | null;
     bot_kind?: string | null;