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/config.js

@@ -278,6 +278,9 @@ export const TUNE = {
                     // 22 logical px is ~30 CSS px on a phone — under half Apple's 44px target, which
                     // is why switching tins felt fiddly. rackHit also pads the touch band (render.js).
   bombRadius: 4.2,  // m blast radius of a bomb ball — 2.5 barely cleared the bodies stood on the crater
+  hordeWarnT: 2.4,  // s of THEY KEEP COMING breather between the set card and the wave landing.
+                    // The horde used to start on the same frame as its own announcement, which reads
+                    // as no announcement at all — Oliver stopped noticing hordes were being called.
   hordeLen: 12,     // s a horde wave lasts
   hordeRate: 3.5,   // zombies spawned per second during a horde. Raised WITH the gun buff below: the
                     // wave is meant to leave a standing crowd on your half when it ends, not to be a
@@ -377,6 +380,9 @@ export const TUNE = {
   bossWinT: 4.4,    // ...and s the EPIC! card holds after a chapter boss. Its OWN number: a boss is
                     // the longest fight in the game and the win was over before it registered, but
                     // stretching setCardT would have made every routine set announcement drag too.
+  bossIntroT: 3.0,  // s the boss walk-on overlay holds the frozen court before it lets go BY ITSELF.
+                    // A boss used to arrive on a band card nobody read ("bosses are just there now") —
+                    // this is the one announcement the player has to be prepared by, not informed of.
   modalIn: 0.34,    // s the modal swooshes in — icon+title from the right, body cascading from the
                     // left, each on easeOutBack. The gesture that dismisses is swallowed until it
                     // lands, so a panic tap can't skip a popup before it has been read.