feedback5 R4: one file per operator kit — kits/tier1..6.js split into kits/ops/<chessId>-<codename>.js (129 kits), kits/shared/tier1..6.js (the helpers two or more kits of a tier use, and each tier's header notes) and kits/index.js (the registry, same keys in the same order); the tier files become re-export shims

Pure move: every line of a kit, of a helper and of the tier headers is copied verbatim (only the headers' first
line names the new file); a helper used by one kit moved into that kit's file. Glue only: the generated imports,
`export default { … }` around each registry entry, `export { … }` lists in shared/tier2..6.js, and tier4's
`(bb, chess, def)` default-argument wrapper as shared/tier4.js `withDefaults` (applied in each tier-4 kit file).
kits/index.js loads every kit file with a guarded dynamic import (browser-safe, no directory listing); tierN.js
re-export the tier registry (TIER_KITS) and their old named exports (tier1 helpers + tinmanKit, tier6
PITHST_ELEMENTS). The merged registry, every tier default and named export have the same keys, order, frozenness
and function sources as before. test/docs-consistency.test.js reads the moved code at its new paths.
Golden: GOLDEN_FULL=1 node --test test/golden.test.js unchanged.

server/sim/content/kits/ops/chess_char_4_07-bpipe.js

@@ -0,0 +1,59 @@
+// server/sim/content/kits/ops/chess_char_4_07-bpipe.js — 风笛 (char_222_bpipe) kit, tier 4.
+// Conventions of the tier-4 kits: ../shared/tier4.js; kit contract and rules: ../README.md.
+
+import { sortEnemyTargets } from '../../../targeting.js';
+import { num, tbb, batFlat, alt, withDefaults } from '../shared/tier4.js';
+
+export default withDefaults({
+  // ===== 风笛 (charger) S2 高效冲击 — next attack 145 % ×2 (charges); talents 精密填弹 / 军事传统
+  //       S1 迅捷打击·γ型; S3 闭膛连发 (BAT +0.7 s, block +1, ATK/DEF up, triple hits); module CHG-Y (“棍棒与口袋”):
+  //       attacks on enemies below 40 % HP use 115 % ATK
+  chess_char_4_07_a: (bb, chess, def) => {
+    const t0 = tbb(def, 0), t1 = tbb(def, 1);
+    const tb = def.traitBb || {};
+    return {
+      skills: alt(def, {
+        'skcom_quickattack[3]': () => ({ kind: 'duration', mods: { atkPct: num(bb.atk), aspd: num(bb.attack_speed) } }),
+        skchr_bpipe_3: () => ({
+          kind: 'duration',
+          mods: { atkPct: num(bb.atk), defPct: num(bb.def), blockCnt: num(bb.block_cnt, 1), batPct: batFlat(def, bb.base_attack_time) },
+          attack: { hits: 3 },
+          onStart({ battle, unit }) { battle.fx('buff', { x: unit.x, y: unit.y, id: unit.id }); },
+        }),
+      }),
+      install(battle, unit) {
+        const hr = num(tb.hp_ratio, 0), sc = num(tb.atk_scale, 0);
+        if (!(hr > 0) || !(sc > 0)) return;
+        battle.on('hit', (c) => { // 攻击力提升至115% (before mitigation)
+          if (c.source === unit && c.dmg.isAttack && c.target.side === 'enemy' && c.target.hpRatio < hr) c.dmg.amount *= sc;
+        }, { owner: unit });
+      },
+      skill: {
+        kind: (def.skill?.maxCharges ?? 1) > 1 ? 'charges' : 'instant',
+        attack: { atkScale: num(bb.atk_scale, 1.45), hits: 2 },
+        onStart({ battle, unit }) { battle.fx('charge', { x: unit.x, y: unit.y, id: unit.id }); },
+      },
+      talents: [
+        { install(battle, unit) { // 精密填弹: 25 % → ×1.3 and one extra target
+          battle.on('beforeAttack', (c) => {
+            if (c.attacker !== unit) return;
+            unit.mem.bpBoost = battle.rng.chance(num(t0.prob, 0.25));
+            if (!unit.mem.bpBoost) return;
+            const extra = battle.enemiesInKeys(unit.rangeKeys, unit, c.profile).filter((e) => !c.targets.includes(e));
+            sortEnemyTargets(battle, unit, extra, c.profile?.priority ?? null);
+            if (extra[0]) c.targets = [...c.targets, extra[0]];
+          }, { owner: unit });
+          battle.on('hit', (c) => { if (c.source === unit && c.dmg.isAttack && unit.mem.bpBoost) c.dmg.mul *= num(t0.atk_scale, 1.3); }, { owner: unit });
+          battle.on('attack', (c) => { if (c.attacker === unit) unit.mem.bpBoost = false; }, { owner: unit });
+        } },
+        { install(battle, unit) { // 军事传统: every 先锋 of the team starts with +6 SP
+          battle.on('deploy', (c) => {
+            const u = c.unit;
+            if (u.side !== 'ally' || u.kind !== 'op' || u.ownerId !== unit.ownerId || u.def?.profession !== 'PIONEER' || !u.skill || (u.skill.active && u.skill.isTimed)) return;
+            u.skill.gainSp(num(t1.sp, 6), 'init');
+          }, { owner: unit });
+        } },
+      ],
+    };
+  },
+});