Nothing arrives unannounced: the horde gets its breather, the boss gets a name

THEY KEEP COMING is a 2.4s 'over' beat again (warnHorde in beats.js) instead of a
flash raised on the same frame the wave lands, and the chapter boss walks on behind
an overlay — his name in red over ENTERED THE COURT — held for 3s by the new
self-dismissing modal clock (m.hold) rather than announced on a routine-set card.

startHorde returns a bool: if the court has been taken when the warning expires the
pendingHorde latch is re-armed rather than the set losing the horde it paid for. The
warning ticks on its own clock, not on the 'over' beat, so a beat that moves the
phase underneath it can't strand it (the mgT lock, again).

Three tests, 15 total.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/state.js

@@ -111,7 +111,8 @@ export const G = {
   clearing: false,    // a game just ended: the surviving wave stays and must be killed by HAND before play advances (no auto-sweep). No new spawns, kills don't score.
   afterClear: null,   // what happens once the court is clear: 'changeover' | 'game' | 'set'
   clearWinner: null,  // 'P'|'O' — who took the game/set being cleared (for the milestone card)
-  pendingHorde: false,// a set was won; the horde starts after the set card's pause
+  pendingHorde: false,// a set was won; the horde is WARNED after the set card's pause
+  hordeWarn: 0,       // s left of the THEY KEEP COMING breather; the wave lands when it expires (beats.warnHorde)
   card: null,         // {title, sub1, sub2, color, t} — centered milestone card (set won, duel); the reusable 'block'
   // the modal: a real interruption. Unlike card/flash it FREEZES the world (update() early-returns)
   // and only a tap or key clears it, so a popup can be read without being eaten while you read it.