feedback5 WY: 拟态物质 with 2 copies owned and none left in the pool gives nothing instead of a random same-bond operator (GitHub #207)

The item text 「若已拥有至少2名该初始干员，则再获得1名该初始干员；否则随机获得1名同盟约初始干员」: the 否则 is the
case of fewer than 2 owned. builtinMeta's use_equip_reward_char_chess returned only when grantChess(base) gave a piece,
so an elite 溯光星源 plus 2 normal copies (all 5 Ⅵ阶 copies) fell through to the same-bond roll (白面鸮 in the report's
seed). Now with 2 owned it asks for the 3rd and stops; the item is still consumed. The bots' carrier choice
(itemTarget) skips 2 copies whose pool is out.

Tests: test/content/items.test.js (the report with the normal and golden item; 2 copies with the pool drained; 2 copies
with copies left still merge), test/match/bot-smarter.test.js (no carrier on a pair whose pool is out); both fail
without the fix. Docs: META built-ins and bot items, research 04 / 06, DESIGN §25.13.1.
Golden unchanged.

docs/research/04-items.md

@@ -244,7 +244,7 @@ Param names below are the keys of `items[].normal.params` / `items[].golden.para
   params: `refresh_cnt=3.0, choice_cnt=1.0`; buff keys: `use_equip_reward_special_goods_char_chess`
 - **信标** (`chess_item_5_04_e_a`, TV, 3) - On equip: destroy BOTH the item and the target operator; special refresh of refresh_cnt(2) operators of the SAME tier as the target, take choice_cnt(1) free. Multiplayer: at next prep phase send 1 copy of the original operator to the teammate who has the most operators of that operator's bond(s) (tie -> random). Cannot target DIY(自编) operators. Never merges.  
   params: `refresh_cnt=2.0, choice_cnt=1.0`; buff keys: `use_equip_recruit_new_char_and_give_char_to_player_most_bond`
-- **拟态物质** (`chess_item_5_05_e_a`, TV, 4) - On equip: destroy item; if player owns >= 2 NORMAL copies of the target operator (field+hand), give 1 more normal copy (usually triggers 3->elite merge); else give 1 random normal operator sharing a bond with the target. Never merges.  
+- **拟态物质** (`chess_item_5_05_e_a`, TV, 4) - On equip: destroy item; if player owns >= 2 NORMAL copies of the target operator (field+hand), give 1 more normal copy (usually triggers 3->elite merge); else give 1 random normal operator sharing a bond with the target. Never merges. With >= 2 owned and no copy left in the pool (an elite holds 3 of a tier-6's 5) the remake gives nothing: the else is only for < 2 owned (GitHub #207, 0.2.0).  
   params: `-`; buff keys: `use_equip_reward_char_chess`
 - **博士投影** (`chess_item_5_06_e_a`, TV, 5) - Normal: equip onto any normal operator (occupies a slot until next round start), at the start of the next round destroy item and promote the operator to elite(精锐/golden). Golden: on equip, destroy item and promote immediately. On promotion, equipped items return to hand.  
   params: `-`; buff keys: `equip_round_start_upgrade_char`

docs/research/06-multiplayer-ux.md

@@ -358,7 +358,7 @@ Visual [SHOT]: the banner is a dark strip with orange chevrons and orange-skull
 - A **normal** unit uses 1 copy and an **elite** uses 3.
 - **Counted:** units on every player's battlefield, bench and temp bench, from any source (buy, reward, strategy effect, 拟态/copy effects).
 - **Not counted:** cards currently displayed in any shop.
-- When owned copies ≥ the cap, a refresh can't roll that name. Some effects fail when the cap is hit (杜遥夜's search; possibly 拟态物质 or 煌's sell effect).
+- When owned copies ≥ the cap, a refresh can't roll that name. Some effects fail when the cap is hit (杜遥夜's search; possibly 拟态物质 or 煌's sell effect). [0.2.0: the remake's 拟态物质 gives nothing when 2 copies are owned and none is left — GitHub #207; its 否则 same-bond operator is only for fewer than 2 owned.]
 - Selling (1 fund per bench unit) returns copies. A player's **defeat or quit returns all their copies immediately**.
 - The server must own the pool (authoritative) and update it in real time for everyone.