feedback7: merge fb7-render — #382 赤刃明霄陈 S3 sword-qi drawn (sim chen3Wave fx), #381 enemy attack recovery held in interpolation, #380 push / pull slide (corpse stays where pushed; same-step kills finish the slide), #384 eye masks, 香槟炸弹 HP bar hidden, #246 an unwound attack plays its whole clip

- Conflicts with the merged fb7-hud (both added display-only snapshot lists): server/sim/battle/events.js, types/core.js,
  public/js/render/interp.js, docs/SIM.md, docs/design/network.md — union of ammo / wolves / neg and stand / standCut.
- Grok review: MERGE AFTER FIXES — the HIGH finding (same-step push kill) fixed on the branch (7a33bc7e).
- Golden: diy-073 / diy-074 (fx counts only; union OK); broad node --test 5442 (5441 pass, 0 fail, 1 skipped); lint 0
  errors; typecheck.

docs/design/network.md

@@ -23,7 +23,14 @@ 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, down?, elem?, ammo?, wolves?, neg? }` 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, 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
+  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
+  extrapolates nothing while the newest snapshot still holds a stand; `standCut: [[id, at]]` — the latest time each
+  listed enemy's recovery was cut or ignored (失衡, fear, stun, hiding, leaving): an interval with a cut inside it stays
+  linear. A newest snapshot showing a death, a stun or a block is not extrapolated. Old snapshots without them
+  interpolate linearly; nothing is inferred from the attack animation.
 - `b.ev` — `{ fieldId, ev: [ ... ] }` event tuples: `['spawn', UnitInfo]`, `['atk', srcId, tgtId, projKind]`, `['dmg', tgtId, amount, type]`, `['heal', tgtId, amount]`, `['skill', id, on:0|1]`, `['die', id, reason]` (reason `'killed'`, `'retreat'`, `'expired'` …; only `'killed'` plays an operator's knock-down sound), `['status', id, key, on]`, `['fx', kind, x, y, extra]` (`'hitCap' {id, n}` = a cancelled 限伤 hit, drawn as nothing, §20.12; `extra.form` = the unit's model form from then on (an enemy's mode, a 傀儡师's 替身 §22.11) — `shared/protocol.js fxForm`, state like a spawn: never dropped by the client, §21.4), `['layer', playerId, bondId, n]`, `['bounty', playerId, coins]`, `['deploy', id]`
 - `m.toast {kind, text}` · `m.ticker {text, id, type, priority, playerId}` (the strip plays the highest priority first, §21.10) · `m.emote {playerId, id}` · `m.result {...}`
 - `m.unitStats {seq, round, units: [unitStatsEntry]}` — the answer to `g.unitStats` (`seq` echoed): every own board operator / summon by uid with `{id, uid, defId, hp, alive, maxHp, atk, def, res, interval, blockCnt, moveSpeed, range?, base: {…same}}` (shared/protocol.js `unitStatsEntry`; `range` = an ally's live range grid, facing RIGHT, never a target-selection grid, §21.16) as its next battle starts (§18.5)