0.2.3: prepare follow-up fixes and client features (#407, #408, #410, #413, #431, #435, #436, #440, #444)

Add special-target activation without bypassing attack cadence, cooperative
card preferences and emotes, skill sound banks, per-operator voice choices,
text sizing, install prompts, closed-tab recovery and unanimous setup rerolls.
Retain late deployment elapsed time and resolve echo/counter pulses without
recursive hook overflow. Independent final review remains pending.

Golden: roster-016, roster-035, roster-036, roster-045;
boss-boss_1-pair, boss-boss_3-pair, boss-boss_5-pair, boss-boss_7-pair,
hidden-boss_9-pair; solo-HARD-9-boosted: Lemuen attack cadence.
diy-132: Necras extra activation targets.
coop2-NORMAL-14-standins: cooperative purchase preference and simulation fixes.
hidden-boss_10-solo: echo pulse FIFO resolution.
See DESIGN 28.13-28.24 for assumptions, sources and contributor credit.

docs/design/engine.md

@@ -189,3 +189,16 @@ and marks. Leaving clears that source's state without clearing another still-dep
 
 凯尔希·思衡托 S2 uses its mixed attack/heal target condition for automatic activation: either an injured, healable ally
 or a selectable enemy in its expanded running range; operation cooldown and other controls still apply (§28.10).
+
+### Additional DEFAULT trigger targets (§28.13)
+
+`addTriggerRange(fn, { attackOnly: true })` extends the DEFAULT target check at the owner's next attack opportunity.
+It does not create a per-tick trigger. 蕾缪安 S1–S3 use only their own wanted targets; 死芒 S1/S2 use targets blocked by
+living summons owned by that operator. Sleeping or otherwise unselectable enemies do not count. This only changes
+the condition for activation: 死芒 S2 still links inside its own effect range. Other registered summon areas retain
+the existing per-tick behavior. The optional flag defaults to false for compatibility.
+
+
+0.2.3 echo/counter interaction (DESIGN §28.24): recursively earned “余音” pulses are drained FIFO by that echo in the
+same call, retaining the earned attack value and the lethal-hit pulse. [ASSUMED] This local order avoids exhausting
+the hook-depth guard on scaled hit-count HP; the guard remains unchanged for other recursive handlers.