feat: IPC additions for reminders/events/routines, ack tracking, tool management

- Extend IPC wire protocol: add ListReminders, ListEvents, ListProposedRoutines,
  DismissProposedRoutine, AcceptProposedRoutine IPC methods with request/response
  types. Update wire.go with new message kinds.
- Add ack_sends table (migration #5): tracks sev4 telegram repeat-til-ack
  delivery state with rule name + timestamp, indexed for dedup.
- Add Store.DeleteTool: permanently removes a tool row (for dismissing proposed
  tools), idempotent on missing tool.
- Update tick.go: wire new IPC handlers into daemon tick.

internal/store/tools.go

@@ -88,6 +88,15 @@ func (s *Store) EnableTool(ctx context.Context, name string, cmd []string, destr
 	return nil
 }
 
+// DeleteTool permanently removes a tool row. Used for "dismiss" on proposed
+// tools — there's no dismissed status, the proposal is simply gone and maven
+// can re-propose it later if the same gap is encountered. Idempotent: deleting
+// a tool that doesn't exist is a no-op.
+func (s *Store) DeleteTool(ctx context.Context, name string) error {
+	_, err := s.db.ExecContext(ctx, `DELETE FROM tools WHERE name = ?`, name)
+	return err
+}
+
 // DisableTool sets a tool's status from 'enabled' back to 'proposed'. This is
 // the "disable" act on the authed surface — the tool stays in the store (its
 // provenance preserved) but won't run until re-enabled. Idempotent: disabling