j146 TFIL: the bullet's own heat becomes tunable (TR_TFIL_BULLET_CORE/AURA, default 10/5 = today) and the field-shape A/B is pre-registered

common_libs/movements/the_floor_is_lava.nim

@@ -18,8 +18,19 @@ const BulletCoreRadiusMax = 54.0  ## core radius at power 3.0
 const BulletAuraExtMin    = 36.0  ## aura extension at power 3.0 (slow)
 const BulletAuraExtMax    = 54.0  ## aura extension at power 0.1 (fast)
 
-const BulletCore = 10.0  ## lava accumulation per bullet-overlapping tile
-const BulletAura = 5.0   ## lava accumulation for aura ring tiles
+## j146: the bullet's OWN heat was a Nim `const`, so no env arm could move it
+## and 10.0 is exactly `PathDangerThreshold` — a bullet is never dangerous on
+## its own and the corridor carries the whole field. Same env-overridable-var
+## pattern as `CorridorHeat` below; the DEFAULTS are today's `const`s, so the
+## default field is bit-identical.
+##   TR_TFIL_BULLET_CORE  default 10.0  lava per bullet-overlapping tile
+##   TR_TFIL_BULLET_AURA  default 5.0   lava for aura ring tiles
+const
+  DefaultBulletCore = 10.0
+  DefaultBulletAura = 5.0
+var
+  BulletCore* = DefaultBulletCore
+  BulletAura* = DefaultBulletAura
 
 const EnemyCoreRadius = 18.0  ## half of 36px body
 const EnemyAuraRadius = 54.0  ## 18 + 36
@@ -201,6 +212,8 @@ proc loadTfilHeatShapeEnv*() =
   CorridorHeat = max(0.0, getEnvFloat("TR_TFIL_CORRIDOR_HEAT", DefaultCorridorHeat))
   WallHotness  = max(0.0, getEnvFloat("TR_TFIL_WALL_HOTNESS",  DefaultWallHotness))
   WallRadiance = max(0.0, getEnvFloat("TR_TFIL_WALL_RADIANCE", DefaultWallRadiance))
+  BulletCore   = max(0.0, getEnvFloat("TR_TFIL_BULLET_CORE",  DefaultBulletCore))
+  BulletAura   = max(0.0, getEnvFloat("TR_TFIL_BULLET_AURA",  DefaultBulletAura))
 
 loadTfilHeatShapeEnv()
 
@@ -307,6 +320,10 @@ type
                                            ## candidate set of the last pick (j145:
                                            ## lets a caller measure the REGRET of the
                                            ## draw instead of only the drawn value)
+    lastPickSafe:      int                  ## how many SAFE tiles (pathMaxHeat
+                                           ## <= PathDangerThreshold) the last pick
+                                           ## drew from (j146: the size of the set
+                                           ## the heat SHAPE leaves available)
 
 proc initTFIL*(): TFILModule = TFILModule(debugGraphics: false, fire: initFireTracker())
 
@@ -352,6 +369,7 @@ proc resetRound*(m: var TFILModule) =
   m.picks             = 0
   m.lastPickPromoted  = false
   m.lastPickMinTurn   = 0.0
+  m.lastPickSafe      = 0
 
 # ── Commit diagnostics (TR_TFIL_COMMIT_LOG, off by default) ──────────────────
 # One JSONL line per computeMove call, used by the A/B to prove the treatment
@@ -1119,6 +1137,7 @@ proc computeMove*(m: var TFILModule, ws: WorldState): MoveCommand =
     var minTurn = Inf
     for t in candidates: minTurn = min(minTurn, t.turnDeg)
     m.lastPickMinTurn = if minTurn == Inf: ct.turnDeg else: minTurn
+    m.lastPickSafe = candidates.len
     m.commitTarget = (x: m.marginX + (ct.col.float + 0.5) * GridSize,
                       y: m.marginY + (ct.row.float + 0.5) * GridSize)
     m.commitTicks  = TfilCommitTicks