docs: add scheduled_prompts to file map + manager schedule tools (follow-up to #454)

CLAUDE.md

@@ -45,6 +45,13 @@ hive-c0re/         host daemon + CLI (one binary, subcommand-dispatched)
   src/reminder_scheduler.rs  5s poll loop: drains due reminders,
                          resolves file_path container→host, persists
                          payload + delivers pointer string
+  src/scheduled_prompts.rs  sqlite layer for scheduled prompts —
+                         schema, CRUD helpers, cancel-auth chain
+                         (`cancel_authorized` walks topology), catch-up
+                         clamp on resume (#444)
+  src/scheduled_prompts_worker.rs  5s poll loop: fires due rows,
+                         fans out one Message per active target,
+                         re-arms recurring rows, deletes fired one-shots
   src/events_vacuum.rs  host-side hourly sweep of every agent's
                          /state/hyperhive-events.sqlite
   src/crash_watch.rs    poll every 10s; fire HelperEvent::ContainerCrash