0.2.4-dev: round-29 community fixes and the official shared card pool

- Shared card pool and item stock as in the official mode (the owner's request, from the 路标档案馆 video and public notes): solo low-tier exceptions, co-op operators x2, shared item stock with special-item exceptions, normal / advanced occupancy 1 / 2, re-check on buy, 机变 exhaustion, release on consume / destroy / elimination; 整备 never exceeds stock; invariant held <= cap.
- 突袭: one taunt-first reselect right after a revive (the owner's rule); ordinary polls and redeploys keep the 0.2.3 rule; a revive on an enemy's tile stays. #475: online boss / hidden-boss Raid may land on the empty half (owner-limited scope).
- 浊心斯卡蒂 S1 x 坚守 no longer bounce redirected damage, and the two shares conserve the hit (idea of PR #464 by @HappyTanuki).
- Operator fixes adapted from PRs by @Xinglan233 (#459 哈洛德 S2 elemental trigger, #460 涤火杰西卡 shield on the four adjacent tiles, #461 家族徽章 first hit after stealth, #462 松果 S2 regrow per deploy); 克莱门莎 S2 splash 1.1 / 100% ATK and air auto-trigger (#467); 白面 copying 歌蕾蒂娅 / 余 skips the three-member condition (#473, the owner's video).
- 香槟炸弹 is not chosen by friendly auras / heals (PR #468 / #476 by @Siornya); 琳琅诗怀雅 coin balance (PR #450 by @IceCodeNew); Touch prep display (PR #451 by @YinqiMargatroid); lobby header (PR #471 by @YuriRestia); Japanese UI terms (PR #448 by @scutkane).
- AI-only boss countdown grace, render-failure cache / recovery without restarting a battle, device units kept on a same-field re-entry, DIY detail / skill previews, large-text result buttons.
- golden: battle families equal 0.2.3 except diy-135 / diy-136 (克莱门莎); all 18 release matches move through the shared pool, every flip named in docs/history/0.2.4.md §29.12; two coverage scenarios added.

server/match/player/diy.js

@@ -53,13 +53,13 @@ export class DiyStock {
 
   has(baseId) { return this.entries.has(baseId); }
   cap(baseId) { return this.entries.get(baseId)?.cap ?? 0; }
-  left(baseId) { return this.entries.get(baseId)?.left ?? 0; }
+  left(baseId) { return Math.max(0, this.entries.get(baseId)?.left ?? 0); }
 
   /** Take up to n copies; returns the number taken (0 for a base id without stock). */
-  take(baseId, n = 1) {
+  take(baseId, n = 1, { overdraw = false } = {}) {
     const e = this.entries.get(baseId);
     if (!e || !(n > 0)) return 0;
-    const k = Math.min(e.left, Math.floor(n));
+    const k = overdraw ? Math.floor(n) : Math.min(Math.max(0, e.left), Math.floor(n));
     e.left -= k;
     return k;
   }
@@ -76,7 +76,7 @@ export class DiyStock {
   /** { baseId: left } (tests / diagnostics). */
   snapshot() {
     const o = {};
-    for (const [id, e] of this.entries) o[id] = e.left;
+    for (const [id, e] of this.entries) o[id] = Math.max(0, e.left);
     return o;
   }
 }