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.

docs/META.md

@@ -85,7 +85,7 @@ legal from R14 into R15. The client mirrors it
 | 机变 first / other pickers | `spFirst` 30 / `spTurn` 16 (co-op; solo / single human untimed) |
 | PREP | `modes[m].rounds[r].prepTime` (co-op; solo / single human untimed) |
 | COMBAT / 联防 | `modes[m].rounds[r].combatTimeLimit` (= the level's `maxPlayTime`) real seconds = 2× that in game seconds |
-| 最终攻势 / 隐秘核心 | no hard stop: countdown `rounds[r].levelMaxPlayTime` 120 real s; overtime drain from `bossOvertimeAfter` 150 real s, 1 team LP per real s (§3) |
+| 最终攻势 / 隐秘核心 | no hard stop: countdown `rounds[r].levelMaxPlayTime` 120 real s; overtime drain at 120 real s for all-human teams, configured 150 real s with a non-departed AI teammate; 1 team LP per real s (§3) |
 | ROUND_START / after combat / SETTLE | 2 / 1.5 / 3 (presentation delays, `Match.DELAYS`) |
 | bot action delay | 0.9 s (+0.35 s per seat) |
 
@@ -95,7 +95,7 @@ band draft / 机变 / PREP deadline, and BATTLE_CHECK / ROUND_START / SETTLE run
 (draft order and skip, 6 机变 cards, 联防) stay.
 `m.public.deadline` is the absolute end of the current timer (ms epoch, 0 = untimed; combat: estimated end at 2×;
 最终攻势 / 隐秘核心: the boss level's `levelMaxPlayTime` countdown, 120 real s — the battle goes on past it — with
-`m.public.overtimeAt` = when the overtime drain starts, 150 real s; both on the field clock).
+`m.public.overtimeAt` = when the overtime drain starts: 120 real s for all-human teams, 150 real s with an AI teammate at fight start; both on the field clock).
 
 ### 1.1 Band draft
 Co-op: random order (all seats, bots included), one pick per turn, ONE countdown: `BAND_TURN_SECONDS` 50 s per turn,
@@ -682,8 +682,9 @@ Any `choice:` handler whose EffectRef reuses its own key must guard like this (o
   which replaces the fixed pool of 「保持固定血量」 (config `bossHpScale.perPlayer: false` with `solo: 0.25` restores it;
   its optional × alive / 4, `aliveScaling`, stays off); leaders are never scaled by `enemyScale`, their parts and escorts
   keep their own HP. The merged team LP loses leaks (`lpr`), the overtime drain
-  (`bossTurnHpReduceTime` 150 counts REAL seconds, like the boss level's 120 s maxPlayTime that runs out first — the
-  battle goes on — so 1 LP per real second from 150 real s = 300 game s on the 2× field clock; `gd.bossOvertimeDue`)
+  (the boss level's 120 real-second countdown for all-human teams; `bossTurnHpReduceTime` 150 real seconds only with
+  a non-departed AI teammate at fight start. The first deduction follows one complete real second after that threshold;
+  `gd.bossOvertimeDue` receives the fight's frozen threshold — DESIGN §29.1)
   and leader "扣除目标生命" effects (the sim's `lpLoss` hook: boss_7 Doom, 斥退 …); after every change it is written back
   to the alive players as shares of the LP each brought in (`lpAtFinal`, largest remainder), so `lp` in m.public /
   m.private / m.result is what is left (Σ = team LP).
@@ -915,3 +916,24 @@ requests cannot affect a new opening. See DESIGN §28.21 for cancellation and ti
 `botEmotes.js` is isolated from bot decisions and RNG. It sends the existing `m.emote` only in mixed matches, under
 normal cooldown/whitelist rules; `SP_BOT_EMOTES=0` disables it. The cooperation score in `bot.js` and these cosmetic
 choices are explicitly [ASSUMED]; DESIGN §28.15–16 records the source and validation.
+
+### Community follow-up contracts (DESIGN §29)
+
+- `triggerGarrisons` includes `source.copiedFrom` for copied effects. Only Ptilopsis copying Yu/Gladiia at SERVER_PREP_START skips the three-in-row prerequisite, as confirmed by the original-game recording; Saria and other copies keep existing conditions.
+- Jessica's placeable shield uses `shared/summonPlacement.js` for the four orthogonal neighbors, independent of her selected skill, facing or module. Client preview and server moves/swaps use the same grid.
+- Client result statistics resolve DIY and stand-in names from the authoritative BattleSpec. A client cannot replace those names.
+
+### Shared inventory after 0.2.3 (DESIGN §29.8)
+
+`SharedItemPool` derives equipment availability from current ownership across all players: ordinary 1, upgraded 2.
+Equips, merges and returns cannot lose reservations. Consumptions/destruction release ownership [ASSUMED removal
+interpretation]. Shop/reward displays reserve nothing; rejected exhausted purchases retain funds and offers.
+整备 upgrades the purchased item only when `left` still has the golden's second copy; otherwise the item stays
+normal and the charge remains.
+`m.public.sp.cards[].soldOut` disables duplicates when a preceding choice used the final copy; timer/bot choices
+use the same availability. Non-shop effect-only equipment is unlimited.
+
+Operator capacities use measured single-player exceptions and twice those counts in co-op; DIY remains private.
+`take(..., { overdraw: true })` records full occupation of a granted/promoted elite or a Mimic copy beyond capacity;
+normal takes remain bounded. Negative internal balance is a deficit, never negative available stock. Existing
+item selection probabilities and explicit grant weights remain unchanged.