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/design/network.md

@@ -30,7 +30,7 @@ S→C:
 - NOTE: game time in `b.snap`/`b.ev` is carried as **`gt`** (the frame's `t` is the message type).
 - Active finite zero-SP timed skills display `sp=timeLeft`, `spMax=duration` and `UF.SKILL`; after end they display
   `0/0`. Snapshot display capacity does not change runtime SP/cost.
-- `b.snap` — `{ fieldId, gt, units: [[id, x, y, hp, maxHp, sp, spMax, flags, anim]] , dp, killed, total, resolved, down?, elem?, ammo?, wolves?, neg?, stand?, standCut? }` 20 Hz (a countdown summon's `hp` is maxHp × the share of its life left, §25.16.5). Optional, only when non-empty (§18.3): `down: [[id, respawnAt (game s), respawnTime (s), state, row, col]]` — knocked-out operators waiting to redeploy, `state` 0 counting | 1 timer done, waiting for DP | 2 timer done, its tile taken — a safeguard, no ally deploys there (sim/constants.js `DOWN_STATE`); `row, col` = the tile it lies on and comes back on (§21.24); `elem: [[id, element, fill, cooldownEnd (game s), cooldown (s)]]` — the one gauge a unit shows: the fullest (ties by the official element id 神经 < 侵蚀 < 灼燃 < 凋亡), fill with 2 decimals rounded DOWN and kept at 0.01–0.99 outside a burst (§20.8); during a 爆发冷却 the bursting element with fill 1 and the cooldown numbers (else 0, 0); the three HP-bar readouts (0.2.2, GitHub PR #303 / #378 / #383, display only — no sim state reads them, the nine-field tuples and the SP fraction an ammo skill still puts in them are unchanged; `render/interp.js` keeps them per snapshot and `sample()` hands them out from the older snapshot like `flags`, so they step with the skill flag; a malformed entry or an id the snapshot does not list is dropped, a snapshot without the list clears the readout): `ammo: [[id, rounds left, rounds in the magazine]]` — an ally's running ammo skill, whole rounds, the magazine being the activation's real total (extra bullets and refills included; 隐现's S2 holds 14, skill_table `attack@trigger_time`) — the client draws yellow cells in place of the SP bar (the count, not a pixel copy of the official magazine widget — its art is in no game data we have), and UnitInfo `ammoSkill: true` (an ally whose skill is an ammo magazine, known from its first appearance) tells it to draw no standing skill aura; `wolves: [[id, 狼影 left, the talent's maximum]]` — 伺夜's 狼群 (`mem.shadows` / `mem.wolfCapacity`, both the placed and the automatic pack), one diamond per slot under the HP bar (plain diamonds: no official counter art is known, the portrait of PR #378 was not taken), nothing in the 战术点形态; `neg: [[id, fill]]` — the share (0.01–1) of its cap a negative-HP pool holds (斩业星熊's 我执, `unit.negFill`), drawn as the red bar over her drained HP bar. These show only for a living, deployed, visible unit and only when it has one
+- `b.snap` — `{ fieldId, gt, units: [[id, x, y, hp, maxHp, sp, spMax, flags, anim]] , dp, killed, total, resolved, down?, elem?, ammo?, coins?, wolves?, neg?, stand?, standCut? }` 20 Hz (a countdown summon's `hp` is maxHp × the share of its life left, §25.16.5). Optional, only when non-empty (§18.3): `down: [[id, respawnAt (game s), respawnTime (s), state, row, col]]` — knocked-out operators waiting to redeploy, `state` 0 counting | 1 timer done, waiting for DP | 2 timer done, its tile taken — a safeguard, no ally deploys there (sim/constants.js `DOWN_STATE`); `row, col` = the tile it lies on and comes back on (§21.24); `elem: [[id, element, fill, cooldownEnd (game s), cooldown (s)]]` — the one gauge a unit shows: the fullest (ties by the official element id 神经 < 侵蚀 < 灼燃 < 凋亡), fill with 2 decimals rounded DOWN and kept at 0.01–0.99 outside a burst (§20.8); during a 爆发冷却 the bursting element with fill 1 and the cooldown numbers (else 0, 0); the three HP-bar readouts (0.2.2, GitHub PR #303 / #378 / #383, display only — no sim state reads them, the nine-field tuples and the SP fraction an ammo skill still puts in them are unchanged; `render/interp.js` keeps them per snapshot and `sample()` hands them out from the older snapshot like `flags`, so they step with the skill flag; a malformed entry or an id the snapshot does not list is dropped, a snapshot without the list clears the readout): `ammo: [[id, rounds left, rounds in the magazine]]` — an ally's running ammo skill, whole rounds, the magazine being the activation's real total (extra bullets and refills included; 隐现's S2 holds 14, skill_table `attack@trigger_time`) — the client draws yellow cells in place of the SP bar (the count, not a pixel copy of the official magazine widget — its art is in no game data we have), and UnitInfo `ammoSkill: true` (an ally whose skill is an ammo magazine, known from its first appearance) tells it to draw no standing skill aura; `wolves: [[id, 狼影 left, the talent's maximum]]` — 伺夜's 狼群 (`mem.shadows` / `mem.wolfCapacity`, both the placed and the automatic pack), one diamond per slot under the HP bar (plain diamonds: no official counter art is known, the portrait of PR #378 was not taken), nothing in the 战术点形态; `neg: [[id, fill]]` — the share (0.01–1) of its cap a negative-HP pool holds (斩业星熊's 我执, `unit.negFill`), drawn as the red bar over her drained HP bar. These show only for a living, deployed, visible unit and only when it has one
   Optional, only when non-empty (PR #381; display metadata, SIM §9): `stand: [[id, until]]` — the game time an enemy's
   attack recovery ends (`atkStandUntil`; enemies alive, deployed, visible, neither feared nor stunned): when it falls
   between two snapshots the renderer holds the position until then and interpolates the rest (HP / SP unchanged), and
@@ -134,3 +134,9 @@ voting, refuses stale ids and cancels on disconnect/leave; DESIGN §28.21 / META
 
 Explicit local recovery (§28.20) reuses saved hello tokens after a fresh live-tab claim check. Display names and room
 codes are UI metadata only, never authentication. No new network message or nickname/IP matching is introduced.
+
+Optional `coins: [[id, balance, cap]]` is an integer skill-currency readout (§29.6), separate from ammo. It includes zero, is stepped between snapshots and clears when omitted. Result-validation names for board operators are resolved from the server's DIY/stand-in selections, never a supplied display name.
+
+Preparation state carries read-only `prepMapChars` for 外勤医疗. Boss-mate and scouting metadata include them in
+displayed field coordinates. Draft cards expose optional `soldOut` when equipment stock is unavailable; the client
+disables picking and the server checks again before consumption.