feedback5 O21: 自选 kits for 麦哲伦, 令 and 电弧 (with their summons) and the 召唤师 summon deck

- kits/ops/op-mgllan.js, op-ling.js, op-radian.js: every skill, both talents, the trait and every module at every form,
  and the kits of their summons (龙腾.F / .L / .A, “清平” / “逍遥” / “弦惊”, 戴乌 / 赛柯 / 桑特拉).
- kits/shared/summoner.js (new): the summon deck the three share — the holding (charge_token[born], SUM-Y's +3), the
  return of a placed piece that left the field (owner on the field, redeploy time, one held, DP), recalls, the summons
  leaving with their owner (die_to_kill_token).
- kits/index.js: OPERATOR_KIT_FILES += op-mgllan.js, op-ling.js, op-radian.js; kits/README.md: the layout row and a
  pointer for summoner kits.
- tests: test/content/op_mgllan.test.js, op_ling.test.js, op_radian.test.js.
- golden: only diy moved — diy-106 … diy-109 now field the new kits' configurations (operator configurations are appended
  in OPERATOR_KIT_FILES order, so the prototype chunks shift back) and diy-110 … diy-115 are new; every other family is
  byte-identical.

server/sim/content/kits/index.js

@@ -133,6 +133,9 @@ export const OPERATOR_KIT_FILES = Object.freeze([
   'op-haak.js',
   'op-phatom.js',
   'op-crosly.js',
+  'op-mgllan.js',
+  'op-ling.js',
+  'op-radian.js',
 ]);
 
 /**