Playtest #6 fixes: summons placed by hand, boss pool stall, bounties, 联防 leak counter, distinct offers, 机变 card text, phone buy tap, skill triggers, blocking, push force, 孤立, enemies, element bar

- #1 #2 skill / device summons (赫默's drone, 巫恋's doll, 凯瑟琳's devices) are hand cards placed by the player;
  placed summons deploy once at battle start, then a skill summon re-appears at its tile on each cast (the user's call)
- #3 叙拉古 隐匿 ends on time (32 + 0.4 × layers s); 忍冬 S3 迷彩 lasts until her next cast (official), kept apart from 隐匿
- #4 multi-round bounty cards last two battles (the user's call; MULTI_ROUND_BOUNTY_BATTLES), blue / red card text
- #5 the shared boss pool's float dust (≈3.6e-12 HP) stalled Final Assault leaders at 0 %; < 1 HP now clears the pool,
  and the team LP reaching 0 first is a defeat (PRTS)
- #6 #10 机变 cards show their official effect text; an invisible 详情 button no longer swallows the confirming tap on phones
- #7 live ×N counter of a leaker's enemies still on the 联防 field (LP loss stays capped at 10)
- #8 #15 #16 skill triggers per 技能策略: skill-range triggers, injured-ally heals (古米, 塞雷娅), tank take-damage
  triggers with a 3 s cooldown; 新约能天使 S2 shields the highest-aggro operator in range
- #9 official per-enemy model scales (威龙)
- #11 element bar under the unit's HP bar (white = 元素值 left, element-coloured refill after a burst), floor rounding
- #12 枯朽战车 kit per PRTS; every ranged enemy reaches its target's 0.25 collider
- #13 恐惧 wander (萨科塔之翼 at half HP, operator fears make enemies flee) with re-planning after pushes
- #14 push / pull distance by 力度 − 重量 (PRTS table); #17 every blocker attacks what it blocks; ASPD floor 20
- #18 炎佑 is 孤立: no heals or ally buffs
- #19 every free pick-one chess offer (promotion reward, 信标, 寻呼模块) shows different operators
- DESIGN §20 and the normative lines, SIM / META / DATA / PLAYING updated; 2747 unit tests and all 27 browser suites
  green; dev recordings regenerated

server/match/finalAssault.js

@@ -15,13 +15,19 @@
 //   * Overtime: bossTurnHpReduceTime counts REAL seconds like the level's 120 s maxPlayTime (which runs out first; the
 //     battle goes on): from 150 real s (300 game s on the 2× field clock) the team loses bossOvertimeDrainPerSec (1) LP
 //     per real second (gamedata.js bossOvertimeDue); m.public.deadline = the 120 s countdown, m.public.overtimeAt = the
-//     drain start. Minion / boss leaks cost their `lpr`; team LP 0 ⇒ defeat (all fields force-ended); pool 0 ⇒ victory.
+//     drain start. Minion / boss leaks cost their `lpr`; team LP 0 ⇒ defeat (all fields force-ended; PRTS 卫戍协议：盟约 下半
+//     "…使目标生命值扣除至0，则无视倒计时直接失败"); pool 0 ⇒ victory. The first of the two the server registers decides
+//     (Match._finalEnding): a report that arrives after the team LP ran out credits nothing (user playtest #6 item 5).
+//   * Pool HP is a float that never keeps float dust: the hit that would leave less than BOSS_POOL_MIN_HP (1) takes the
+//     rest, so the pool is 0 or ≥ 1 and a leader shown at 0 HP is down (sim/constants.js; the browser's LocalBossPool
+//     follows the same rule, server/sim/spec.js). Before, the per-player crediting of a report could leave 3.6e-12 that
+//     the browser could never deal (user playtest #6 item 5).
 //   * No IN_BATTLE layer gains (flags.layerGainsEnabled = false).
 //   * Hidden Core eligibility (after an R14 win): difficulty in hiddenCore.difficulties, the mode has a hidden round,
 //     Σ activated layers of the alive players measured at the end of the boss round's prep > threshold (solo 350 /
 //     co-op 1200) and team LP > minTeamLpExclusive (1).
 
-import { BOSS_ROW_OFFSET, COLS } from '../sim/constants.js';
+import { BOSS_ROW_OFFSET, COLS, BOSS_POOL_MIN_HP } from '../sim/constants.js';
 import { mirrorDir, normDir } from '../sim/dir.js';
 
 export const BOSS_HIT_STEPS = [0.2, 0.5, 0.8];
@@ -63,7 +69,10 @@ export function bossPoolHp(gd, bossId, aliveCount) {
   return Math.max(1, Math.round(base * tune));
 }
 
-/** The one HP pool every boss field damages. `damage(playerId, amount)` is called by the sim. */
+/**
+ * The one HP pool every boss field damages. `damage(playerId, amount)` is called by the sim (server-run fields) and by
+ * Match._creditBoss (client reports, per player); the hit that would leave less than BOSS_POOL_MIN_HP takes the rest.
+ */
 export class SharedBossPool {
   constructor(hp, { onHit = null } = {}) {
     this.maxHp = Math.max(1, hp);
@@ -76,8 +85,8 @@ export class SharedBossPool {
   damage(playerId, amount) {
     const a = Number(amount);
     if (!Number.isFinite(a) || a <= 0 || this.hp <= 0) return 0;
-    const dealt = Math.min(this.hp, a);
-    this.hp -= dealt;
+    const dealt = this.hp - a < BOSS_POOL_MIN_HP ? this.hp : a;
+    this.hp -= dealt; // exactly 0 when the rest is taken (x − x): no float dust
     if (playerId != null) this.byPlayer.set(playerId, (this.byPlayer.get(playerId) || 0) + dealt);
     if (this.onHit) {
       try { this.onHit(playerId, dealt); } catch { /* reported by the caller */ }