One file owns the court: beats.js, PROJECT.md (né HANDOFF), and tests gate the build

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

config.js

@@ -46,7 +46,7 @@ export const TUNE = {
   // ---- THE DIFFICULTY DIRECTOR. Every dial below used to bottom out by about game 12, which is why
   // a 50-game run stopped changing (games 12..50 were arithmetically identical). They are all keyed
   // on G.runGames now and all keep moving; the ceilings that remain exist for perf or fairness, not
-  // because the curve ran out. See HANDOFF "The difficulty director".
+  // because the curve ran out. See PROJECT.md "The difficulty director".
   // Calibrated to TRACK the old curve through roughly game 12 and then keep going, rather than to
   // replace it: the first pass at this made games 1-30 easier, which is the opposite of the ask.
   zSpawnEvery: 3.0,  // s between spawns in game 1
@@ -70,7 +70,7 @@ export const TUNE = {
                        // for ~120 spawns where the old fixed 12 s x 2.5/s could only ever ask for 30,
                        // and a 40-body court on a 270px-wide portrait screen is mush, not menace.
   // ---- PLAYER HEALTH. A SECOND, SEPARATE damage channel: only ranged attacks touch it. A shambler
-  // reaching you is still instant permadeath (G.mode='eaten') — that decision is settled, see HANDOFF.
+  // reaching you is still instant permadeath (G.mode='eaten') — that decision is settled, see PROJECT.md.
   // There is no HP bar and there never will be: the state shows as blood on the man.
   playerHp: 4,      // hits from ranged attacks you can absorb before you go down
   hurtGrace: 1.1,   // s of invulnerability after a hit — a burst must not delete you in one volley