The burning ball and the gore grade (v389)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

PROJECT.md

@@ -636,6 +636,21 @@ Each phase ships to staging and gets a phone verdict, and tests ride along with
 5. **LATER.** The metal bed (when Oliver has a track: start at the transformation, gore only) and Members'
    Night (option C).
 
+## Session log: the burning ball and the gore grade (2026-10-16, v389)
+
+Oliver picked two of the polish ideas (1 and 5; weather only after he has seen a preview):
+- **The burning ball** (idea 1, reshaped by the old verdict): the spark ring around a perfect contact was
+  "too much" once (see the comment where it lived in render), so nothing is drawn AROUND the contact.
+  A perfect strike (rally or serve, yours only) stamps `ball.hotT = G.idleT`; render draws the ball
+  white and 1.5x through the 50 ms hitstop (the impact frame), a warm additive halo cooling over
+  `TUNE.hotGlowT` 0.45 s, and the ghost streak in gold, at least six long, for the whole flight. Any other
+  hit and every toss clear it. Test: every perfect strike burns, the reply is cold.
+- **The gore grade** (idea 5): when the slaughter owns the court (splatter/eaten, no match, no bench or
+  drill) the world pass gets a `saturation` grey fill and a `multiply` blood cast, weight eased in over
+  ~1.5 s; `TUNE.goreGrade` 0.5 (1.0 tried — the zombies lose their green). The HUD is drawn after it
+  and stays clean. In the story it starts at the TURN (`morph.boss` set), so the boss growing is the
+  moment the picture drains — the metal follows at `run`.
+
 ## Session log: the cup's tableau returns, the act card shows its court (2026-10-16, v388)
 
 Oliver after a full replay: "das im Storyboard benannte 03 Turnier-Tableau sehe ich nie" — right, phases