0.2.5-dev: community round 30 and follow-ups

- Stock: fixed trait gifts (缪尔赛思 / 变形者集群 变形同构体, 耶拉 不融冰, 蜜蜡 / 卡涅利安 迅捷作战粮, 诗怀雅 盟约之币) still occupy stock but are granted past the cap; an operator card already shown in the shop or a reward can be taken after the pool runs out and overdraws (GitHub #498, the owner's decision); item buys and item rewards keep the stock check. 洛洛 / 焰尾 sub-pools use the measured weights (PR #497 by @2321Robin; the occupancy idea of PR #496 by @2321Robin re-implemented differently).
- Boss pairs are drawn at random once per match and fixed to battle start; the Hidden Core reuses them; a leaver does not split a full pair (the owner's decision).
- 阿戈尔 in 联防 no longer re-applies the opening devour HP loss or a false revive; Touch's team medic stays for the match after its holder leaves (owner-approved, official lifetime unverified).
- Auto-skill ranges: 司霆惊蛰 S2, 斩业星熊 S3 against air, 予愿安洁莉娜 S3; 自在's post-rebirth invulnerability is also untargetable (#510); Horn / Clementia / catapult / 忍冬 first hit (PR #502 by @Xinglan233); 不融冰 / tear gas trigger on real damage.
- Bond layer-up sound in round start / draft / prep / battle (#482): one channel, a new cue replaces the old, no extra cooldown; a prep update that adds layers and activates a bond plays one cue.
- Client: multi-swing fix (#506), refresh single-flight (PR #507 by @robll-v1), LP tower keeps the settled value with a −N tick (PR #504 by @robll-v1), export with only 潜能 / 练度 changes (PR #503 by @Xinglan233), spectator rosters list DIY members (PR #505 by @Xinglan233), banned members beside bond tooltips (PR #494 by @YuriRestia), recovery action above the away overlay (PR #511 by @RainoutOvO), the /dev/sim-check.html consistency page (PR #492 by @Cloudnyco), Korean (PR #490 by @D-Roote) and English Victoria wording (PR #499 by @YuriRestia).
- golden: 45 of 287 scenarios move against 0.2.4 (roster 17, bonds 3, fields 6, matches 17, standins 2), each attributed in docs/history/0.2.5.md §30.9 / §30.16.

server/match/audit.js

@@ -30,7 +30,7 @@
 //                 units > seat, research 08 §5); leakers = players with counted leaks
 //   settle        no unite ⇒ loss = min(cap, counted leaks); after 联防 a leaker loses ≤ cap (its leaked enemies'
 //                 offspring count too), everybody else ≤ min(cap, own counted leaks); LP ≤ 0 ⇔ eliminated
-//   final assault fields pair alive players by seat, team LP = Σ alive LP, boss pool = bossPoolHp(); hidden core only
+//   final assault fields follow the saved per-match pairs, team LP = Σ alive LP, boss pool = bossPoolHp(); hidden core only
 //                 after a win when hiddenEligible() holds
 //   result        each title ≤ once, ≤ 1 title per player, onlyOnWin titles only on a win, roundsPassed per player,
 //                 Σ alive players' LP = the merged team LP after the Final Assault
@@ -44,7 +44,7 @@
 import { PHASE } from '../../shared/constants.js';
 import { collectViolations } from './invariants.js';
 import { mergeTile, pieceDir, canPlace, placeClass } from './board.js';
-import { pairPlayers, bossPoolHp, hiddenEligible } from './finalAssault.js';
+import { bossPoolHp, hiddenEligible } from './finalAssault.js';
 import { helperOrder } from './unite.js';
 import { BAND_TURN_SECONDS } from './Match.js';
 
@@ -449,15 +449,23 @@ export function attachAudit(m, { invariants = true, limit = 200 } = {}) {
   });
   wrap(m, 'startFinalAssault', function (orig, hidden) {
     const alive = m.alivePlayers();
+    const before = m.bossPairs?.map(g => g.slice()) ?? null;
     const lpSum = alive.reduce((s, p) => s + Math.max(0, p.lp), 0);
     const teamLp0 = m.teamLp;
     const res = orig(hidden);
     runInvariants();
     check('final assault', () => {
       if (!alive.length) return;
-      const groups = pairPlayers(alive).map((g) => g.map((p) => p.playerId).join(','));
+      const pairs = m.bossPairs || [];
+      const memberIds = pairs.flat();
+      if (pairs.length !== Math.ceil(alive.length / 2) || pairs.some(g => g.length < 1 || g.length > 2)
+        || new Set(memberIds).size !== memberIds.length
+        || JSON.stringify([...memberIds].sort()) !== JSON.stringify(alive.map(p => p.playerId).sort())) fail('boss pairing does not cover every alive player once');
+      if (before && before.flat().every(id => alive.some(p => p.playerId === id)) && before.flat().length === alive.length
+        && JSON.stringify(before) !== JSON.stringify(pairs)) fail('boss pairing changed after preparation');
+      const groups = pairs.map(g => g.join(','));
       const fields = m.fields.map((f) => f.players.join(','));
-      if (JSON.stringify(groups) !== JSON.stringify(fields)) fail(`boss fields ${fields.join(' | ')} != seat pairs ${groups.join(' | ')}`);
+      if (JSON.stringify(groups) !== JSON.stringify(fields)) fail(`boss fields ${fields.join(' | ')} != saved pairs ${groups.join(' | ')}`);
       m.fields.forEach((f, i) => { if (f.fieldId !== `b${i + 1}`) fail(`boss field id ${f.fieldId}`); });
       if (!hidden && m.teamLp !== lpSum) fail(`team LP ${m.teamLp} != Σ alive LP ${lpSum}`);
       if (hidden && m.teamLp !== teamLp0) fail(`hidden core changed team LP ${teamLp0} → ${m.teamLp}`);