feedback1 cell: bots let their placement step judge the operator a 突变细胞 transformation gained

With the bench rule the gained operator starts the next prep on the bench while its carrier's deployment
is free. The buy loop's pre-emptive bench shed sells the weakest bench single by piece value while the
bench is crowded, before the placement step runs: in 20 solo 绝境 matches on 昆图斯 it sold 44 of 222
gained operators that way.

- bot.js: botPrepEndSteps remembers the chess owned when the prep ends (rememberOwned); the shed's
  keepFresh now also spares a piece gained since then (a transformation's operator, battle-result /
  round-start grants), so the lineup step decides about it. No memory yet (a first prep, a seat just
  put under AI 托管) changes nothing.
- botbench, decisions only: 昆图斯 (seeds 201-220) 绝境 7 -> 11 / 20 wins with the fix (8 on the WA
  build), 险境 16 -> 17 / 20 (15); the bots' own strategies unchanged within noise (solo 绝境 8 / 12 both,
  solo 险境 19 / 24 both, co-op 绝境 4 AI 9 -> 8 / 36).
- Test: a real solo 绝境 昆图斯 bot match (seed 9 sold its R7 operator in the R8 prep before the fix):
  no gained operator shed in its first prep, none waiting on the bench beside a free deployment.
- DESIGN §21.1 / §21.6 / §6.6, META and the CHANGELOG line say so.

CHANGELOG.md

@@ -41,7 +41,7 @@
 
 - 拉普兰德：获得她之后本回合的首次刷新也会叠叙拉古层数，每名拉普兰德各自计算。
 - 昆图斯的突变细胞不会用完消失：每场战斗后装备者换成高一阶的随机干员，突变细胞和其他装备退回整备区，可以再次配发。
-- 突变细胞换来的新干员和官方一样进入整备区，原来的格子空出来、可放置角色加 1，需要自己重新部署；凑齐同名干员时照常合成精锐（PR #2 指出）。
+- 突变细胞换来的新干员和官方一样进入整备区，原来的格子空出来、可放置角色加 1，需要自己重新部署（人机和 AI 托管会照常部署它）；凑齐同名干员时照常合成精锐（PR #2 指出）。
 - 标准模拟按官方禁用奥术等盟约，卡片和盟约详情标明「本局禁用」。
 - 变形同构体配转职装备时，盟约成员列表和干员卡片算上装备者（标「同构」）。
 - 带奥术法阵时，场上炎佑造成伤害也会使目标失去特殊能力 5 秒；带源石溶剂时炎佑每秒受到 60 点伤害。