feedback7 R22-LOADOUT: the battle takes each operator's potential and 练度 from its spec entry; golden: unchanged

A PlayerBattleInput operator entry may carry `potential` (潜能 1–6) and `cultivate` (练度 0–3, the 自持有 bonus) —
the player's 干员调配 settings (the owner's decision of 2026-10-08). Specs without them field what 0.2.1 fielded, so
no golden scenario moves here; the match states both next.

- shared/loadoutRecord.js: a resolved loadout carries `potential`; loadoutRecord composes the record at it first
  (shared/potential.js atPotential), then the skill / module as before.
- server/sim/simdata.js: getChess(id, { …, potential }), getDiy(slot, pick, potential) (an owned 自选 pick's form at it;
  a prototype has none — `diyProto` on its record, shared/diy.js), getToken / getDiyToken compose the owner variant at
  the owner's potential (talents; a 自选 summon's deploy limit / holding / count); the per-battle loadout view keeps it
  per unit; DataSource.cultivateMul reads the effects.json CHAR_MAP record's char_attribute_mul.
- battle/players.js: `potential` composes the def (never a stand-in's); `cultivate` sets unit.cultMul — ×ATK / ×DEF /
  ×max HP in the unit's Πmul (units.js), a multiplier of its own, never summed with the 直接乘算 percentages (PRTS
  盟约记录 「…与自持有干员的属性加成独立」); a stand-in, a prototype 自选 pick and a summon take none [ASSUMED for summons].
- spec.js keeps both only when well-formed (never on a stand-in or a summon); content/index.js passes the potential to
  the loadout sync; the kits that read a summon variant raw (content/tokens.js ownVariant, summoner.js tokenStat,
  多萝西, 麦克尼斯特) compose it at the owner's potential; UnitInfo carries `potential` (below 6) / `cultivate`;
  unitStatsEntry counts the 练度 in the unit's own numbers (no green delta for it on the card).
- Docs: SIM.md §2 (Πmul), §9 (UnitInfo), §12.
- Tests: test/sim/potential-battle.test.js (new, 6): a unit at each potential (刺玫 413 / 17 / 70 s and 8 % at 潜能1;
  the elite on 不装备), the four 练度 tiers and their product with a +20 % ATK bonus, HP at deployment and the card's
  numbers, stand-in / prototype take neither and an owned 自选 pick both, Mon3tr / 望's 棋子 / “小自在” at the owner's
  potential, the spec round trip (kept, dropped, the JSON spec gives the same result digest), two players with the same
  chess at different settings on one field; test/sim/loadout.test.js expects the resolved loadout's new fields.

test/sim/loadout.test.js

@@ -24,7 +24,7 @@ const WTRMAN = 'token_10030_mlyss_wtrman';
 
 test('resolveLoadout: legal choices resolve, anything else falls back to the default', { skip }, () => {
   const n = C[INSIDE];
-  assert.deepEqual(resolveLoadout(n, null), { skillIndex: 1, moduleId: null, skillIsDefault: true, moduleIsDefault: true, isDefault: true });
+  assert.deepEqual(resolveLoadout(n, null), { skillIndex: 1, moduleId: null, potential: 6, skillIsDefault: true, moduleIsDefault: true, potentialIsDefault: true, isDefault: true });
   assert.equal(resolveLoadout(n, { skillIndex: 0 }).skillIndex, 0);
   assert.equal(resolveLoadout(n, { skill: 0 }).skillIndex, 0, 'client shape { skill, module } accepted');
   assert.equal(resolveLoadout(n, { skillIndex: 2 }).skillIndex, 1, 'S3 is not unlocked at E1 → default');
@@ -80,7 +80,7 @@ test('getChess(id, loadout): selected skill (bb, SP, trigger) and module (stats,
   assert.equal(s1.skill.id, 'skchr_inside_1');
   assert.deepEqual(s1.skill.bb, C[INSIDE].skills[0].bb);
   assert.equal(s1.skill.spCost, C[INSIDE].skills[0].spCost);
-  assert.deepEqual(s1.loadout, { skillIndex: 0, moduleId: null, skillIsDefault: false, moduleIsDefault: true, isDefault: false });
+  assert.deepEqual(s1.loadout, { skillIndex: 0, moduleId: null, potential: 6, skillIsDefault: false, moduleIsDefault: true, potentialIsDefault: true, isDefault: false });
   assert.deepEqual(s1.stats, def0.stats, 'a skill choice never changes stats');
   assert.ok(Object.isFrozen(s1) && Object.isFrozen(s1.skill.bb), 'variant defs are frozen like every def');
   assert.equal(C[INSIDE].skill.skillId, 'skchr_inside_2', 'the raw record is never mutated');