feedback5 WE1: 链愈师 heal jumps within the 3×3 around the last one healed (x-4), a full-HP ally included (follow-up 27)

PRTS 分支特性信息 链愈师: "跳跃范围为x-4…不会对已跳跃过的单位重复跳跃", "优先跳跃至范围内生命比例最低＞部署时间点最晚的我方单位。
可选择满生命我方单位为跳跃目标，但仍受禁疗制约" (range_table x-4 = the 3×3 around the unit).

- ai.js chainHealNext: an ally on the 3×3 of tiles around the last one healed, not yet in the chain, no device / hidden /
  孤立 / 禁疗 unit (the healer's healThrough summon excepted), the lowest HP ratio first — a full-HP ally too, the chain
  goes on from it — then the latest deployed. doHeal (莎草) and Mon3tr's chainFrom both use it (her fullProsts case is
  now general and gone). It used to be the most injured ally within 2.5 tiles. [ASSUMED] 禁疗 = not selected.

Golden: roster-004, roster-005, roster-023, roster-024, bond-sargonShip-low (莎草's chains: other jump targets, full-HP
links); diy-133, diy-134 (Mon3tr). Others unchanged (no match fields a chain healer).

Tests: test/sim/feedback5-chain-heal.test.js (new, 3); op_monstr, kits_t1t2, feedback2-surtr-stealth pass.
Docs: SIM.md §Professions (chainhealer row).

docs/SIM.md

@@ -1213,7 +1213,7 @@ header of professions.js).
 | phalanx | no attack & DEF +200 %, RES +20 (bb) while the skill is off; while on, `rangeAoe`: each attack strikes every selectable enemy on its range at once (blocked enemies included; a stealthed one only when revealed or blocked), the same damage near and far, instant (`'beam'`) — "群体法术伤害" (secondary: Terra Wiki, Phalanx Caster: "attacks hit all enemies within their range"; supporting: PRTS 林 S3 备注 "单次普攻最多触发1次效果" — one normal attack can kill several — the same 锁定攻击范围 shape as the 轰击术师, and PRTS 溅射半径一览 documents no splash radius for it (it omits the 撼地者 too, so this is not proof); no primary source states a target cap; community report E3: it used to be one bolt + a 1.1 splash). 卡涅利安's charged S1 keeps the skill-off trait, 不攻击 included (kit `canAttack`, PRTS 备注) |
 | physician | heal the lowest HP% injured ally in range (a skill `targeting.maxTargets` widens any heal profile) |
 | ringhealer | heal 3 allies |
-| chainhealer | heal bounces 3× (−25 %, bb chain.*) within 2.5 tiles |
+| chainhealer | the heal jumps on to 3 units in all (−25 % per jump, bb chain.*), each jump inside the 3×3 of tiles around the last one healed (range x-4), never twice to one unit, the lowest HP ratio first — a full-HP ally too (healed for nothing, the chain goes on from it) — then the latest deployed; no 禁疗 / 孤立 unit (a healer's `healThrough` summon excepted) — PRTS 分支特性信息 链愈师 (`ai.js chainHealNext`, shared with Mon3tr's kit; until 0.2.0: the most injured ally within 2.5 tiles) |
 | healer (流明) | heal ×0.8 (bb heal_scale) beyond 2 tiles |
 | wandermedic | heal + reduce element gauges by 50 % ATK (bb ep_heal_ratio); also targets uninjured allies with gauge |
 | incantationmedic | arts attack; EVERY damage the unit deals heals the lowest ally in range for 50 % (bb scale) of it — the official trait buff (`vendla_tr` / `reed2_tr` / `titi_tr`) is ON_AFTER_OUTPUT_DAMAGE, so skill and DoT damage heals too (缇缇's 凝固的时光 ticks, 焰影苇草's S2 fireballs while she is disarmed); a skill that triggers it for one named ally says so ("仅对该角色触发…特性") and the damage instance carries that ally (`DamageInfo.traitAlly`) |