feedback7 R22-GHSIM: #298 rework — the one-interval gap of an instant skill with no attack of its own sits on the skill (nextCastAt), not on the operator's attack cooldown: its casts no longer replace the attacks / heals that were due; golden: back to 2 moves against the code before #298 (roster-033, roster-034)

Review of fb7-gh-sim (MERGE AFTER FIXES, high): 4128965a wrote u.atkCd after such a cast and gated the tick casts on it,
so each cast took the attack that was due — 度算浪波 with 迅捷: 15 casts, 0 attacks in 20 s (silenced: 15 attacks);
冲锋号令·γ型 and 医疗无人机 lost one attack / heal per cast; after an idle cast the next attack waited the armed cooldown.
PRTS 度算浪波 is an automatic instant throw, not an attack.

Now (skills.js): such a cast (instant / charges, no spec.attack, not the DEFAULT cast right before an attack) sets
skill.nextCastAt = now + the unit's attack interval, and the casts checked in skill.tick wait for it; the attack cooldown
is not touched (reset on deployment, like opReadyAt). Measured (20 s, 引星棘刺 S1, 迅捷 229 layers): 12 casts — the first at
4 s as SP fills (#124), then one per 1.36 s — and 14 attacks, as many as silenced; without 迅捷 3 casts and 14 attacks; an
idle cast does not delay the next attack (1 tick). [ASSUMED] one attack interval stays.

Tests: bonds_addon «迅捷 refills 引星棘刺 S1 at once …» now asserts the casts take no attack (attacks = the silenced run's;
fails on 4128965a: 0 vs 4, and before it: 180 casts in 6 s); op_wang waits skill.nextCastAt; playtest6-skills (锏) back to
its original timing. test/content + test/sim: 2835 pass. Docs: SIM.md §7, PLAYING.md 技能自动释放 (no attack is taken).

Golden: against 4128965a's files roster (21) bonds (9) fields (9) matches (16) standins (6) diy (22) scenarios move back; against the
same code with the gap disabled only roster-033 and roster-034 differ (引星棘刺 S1 recast within one interval) — the
84-scenario move of 4128965a came from the attack cooldown, now gone.

test/content/op_wang.test.js

@@ -269,8 +269,8 @@ test('her stock (the owner\'s decision of 2026-10-06): the placed 棋子 occupy
     assert.deepEqual([u.skill.activations, w.stock], [1, 7], `${S}: 立即获得两枚棋子`);
     h.step();
     assert.ok(!u.s.flags.noSp, `${S}: below the cap, no 阻回`);
-    assert.ok(u.atkCd > 0, `${S}: the cast took her attack cycle (GitHub #298)`);
-    h.run(u.atkCd);                                  // the next cast waits it out
+    assert.ok(u.skill.nextCastAt > h.b.time, `${S}: the next cast waits one attack interval (GitHub #298)`);
+    h.run(u.skill.nextCastAt - h.b.time);           // wait it out
     u.skill.gainSp(999);
     h.step();
     assert.deepEqual([u.skill.activations, w.stock], [2, 8], `${S}: 最多拥有8枚`);