Put a steward on the court

A new ordinary body between the shambler and the brute: a stadium security
steward in a hi-vis vest, 2.15 m, three hp, a touch slower. Deliberately the
mildest thing in the advanced pool — no wound skins, no special rule to learn —
so he can unlock early (game 4) and thicken the ordinary crowd, which a mix of
two shamblers never did. A fifth of horde spawns come out as stewards too, so a
grown wave is not one body dying at one range.

Sheet generated against the existing shambler walk (assets/_sheet_dwalk.png),
sliced to a 4-frame cycle, so he shambles as smoothly as the crowd he walks in.

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

config.js

@@ -205,6 +205,9 @@ export const TUNE = {
   runnerSpeed: 3.2, // runner ('f') speed multiplier over the shamble
   runnerVMax: 4.2,  // hard runner speed cap — the late-game ramp must stay humanly reactable
   shamblerHp: 2,    // splat-quality hits a classic shambler ('a'/'b') soaks before it dies — only the runner ('f') is still one-shot glass
+  stewardHp: 3,     // the steward ('d'): one hit tougher than the crowd he walks in. Deliberately NOT
+                    // a brute — no wound skins, no special rule, just a bigger body that takes one more
+  hordeSteward: 0.2, // share of horde spawns that come out as stewards (from game 4)
   // fire: the flame ball no longer just kills what it touches, it starts an epidemic.
   burnTime: 3.0,    // s a body burns before the fire goes out
   burnDps: 2.0,     // hp lost per second while burning — burnTime*burnDps must exceed bruteHp or tanks walk out of the fire