TFIL: remove the virtual centre pillar from the shipped default; register j102 env reads

The default mover painted a 30/10 radiance blob on the arena centre even
though the arena has NO physical pillar there, creating a 4x4 tile
(144x144 px) exclusion zone over open centre floor. Set
PillarHotness/PillarRadiance to 0/0 in the shipped default (matching the
ring variant) and add TR_TFIL_PILLAR_ON=1 to restore the old 30/10 field
for A/B without a rebuild; registered in env_report.

Because the shipped default legitimately changed, the default-path parity
golden (fixtures/tfil_commit_default.golden) was regenerated from the NEW
default, with an explicit 'deliberate default change' note in the test so
a future failure is treated as a real regression.

Also register the three env reads job j102 added in common_libs/bitbrain
(TR_BITBRAIN_MODE / _DECAY_EVERY / _DECAY_SHIFT), which the env-report
guard was failing on.

Verification: test_env_report all green; test_tfil_commit_env 30/30.

ModularBot_garage/src/env_report.nim

@@ -256,6 +256,8 @@ proc printEffectiveValues(ctx: EnvReportContext) =
   emit("TR_TFIL_HEAT_TAU", $TfilHeatTau, sourceOf("TR_TFIL_HEAT_TAU"))
   emit("TR_TFIL_HEAT_POWER_GAIN", $TfilHeatPowerGain,
        sourceOf("TR_TFIL_HEAT_POWER_GAIN"))
+  emit("TR_TFIL_PILLAR_ON", onOff(PillarHotness > 0.0),
+       sourceOf("TR_TFIL_PILLAR_ON"))
 
   # ── ramming ───────────────────────────────────────────────────────────────
   emit("TR_RAM_OPPORTUNITY", onOff(RamOppEnabled), sourceOf("TR_RAM_OPPORTUNITY"))
@@ -381,6 +383,8 @@ proc knownEnvNames*(): seq[string] =
     BB_MEM_ENV, BB_GAINS_ENV, BB_N_ENV, BB_NADE_ENV, BB_RANGE_ENV, BB_LOG_ENV,
     BB_MIN_OBS_ENV, BB_WARMUP_ENV, BB_ADAPT_ENV, BB_CALIB_ENV, BB_DECAY_ENV,
     BB_DECAY_FRAC_ENV, BB_SEED_ENV, BB_RESET_ON_TARGET_ENV,
+    # common_libs/bitbrain (counted-SBC library) reads these inline; job j102
+    "TR_BITBRAIN_MODE", "TR_BITBRAIN_DECAY_EVERY", "TR_BITBRAIN_DECAY_SHIFT",
   ]
   # rack names are constructed from the prefix + gun table, not spelled out
   for g in RackGunNames:
@@ -404,6 +408,7 @@ proc knownEnvNames*(): seq[string] =
     "TR_TFIL_TILE_REPLAN", "TR_TFIL_COMMIT_TICKS", "TR_TFIL_NO_REV",
     "TR_TFIL_COMMIT_LOG",
     "TR_TFIL_HEAT_TIME", "TR_TFIL_HEAT_TAU", "TR_TFIL_HEAT_POWER_GAIN",
+    "TR_TFIL_PILLAR_ON",
     # harness vars (read by the test framework, inherited by the bot, so they
     # must NOT be reported as typos)
     "TR_SERVER_JAR", "TR_BATTLE_RUNNER", "TR_BATTLE_RUNNER_DIR",

common_libs/movements/the_floor_is_lava.nim

@@ -31,8 +31,17 @@ const CorridorHeat = 20.0
 const WallHotness  = 30.0
 const WallRadiance = 10.0
 
-const PillarHotness  = 30.0
+## The "virtual centre pillar": heat OUR code paints on the arena centre even
-const PillarRadiance = 10.0
+## though the arena has NO physical pillar there. The shipped default is now
+## OFF (0/0) — the bot must not avoid open centre floor for no reason. Set
+## `TR_TFIL_PILLAR_ON=1` to restore the old 30/10 field for A/B (see
+## `loadTfilPillarEnv`). The ring variant already ships 0/0.
+const
+  PillarHotnessOn  = 30.0
+  PillarRadianceOn = 10.0
+var
+  PillarHotness*  = 0.0
+  PillarRadiance* = 0.0
 
 const CommitTicks           = 15    ## ticks to commit to a dodge point
 const MinCommitTicks        = 5     ## must commit for this many ticks before danger replan allowed
@@ -113,6 +122,19 @@ proc loadTfilCommitEnv*() =
 
 loadTfilCommitEnv()
 
+proc loadTfilPillarEnv*() =
+  ## Read the virtual-centre-pillar knob. OFF by default: the shipped field is
+  ## the arena with no invented centre hazard. `TR_TFIL_PILLAR_ON=1` restores
+  ## the pre-change 30/10 field so the two defaults can be A/B-ed offline.
+  if getEnvBool("TR_TFIL_PILLAR_ON", false):
+    PillarHotness  = PillarHotnessOn
+    PillarRadiance = PillarRadianceOn
+  else:
+    PillarHotness  = 0.0
+    PillarRadiance = 0.0
+
+loadTfilPillarEnv()
+
 # ── Time-indexed bullet heat (TR_TFIL_HEAT_TIME=1, default OFF = shipped) ─────
 #
 # WHY: the flat model gives every bullet-overlapping tile the same heat and

common_libs/tests/test_tfil_commit_env.nim

@@ -15,6 +15,14 @@
 ## Regenerating it from the new code would defeat the check — only do that after
 ## a DELIBERATE change to the shipped defaults.
 ##
+## *** DELIBERATE DEFAULT CHANGE (this commit): the virtual centre pillar was
+## removed from the shipped default (PillarHotness/PillarRadiance 30/10 -> 0/0;
+## TR_TFIL_PILLAR_ON=1 restores it). That legitimately changes the DEFAULT move
+## path, so the golden was regenerated from the NEW default. This is NOT a
+## regression being blessed: the fixture replay below is byte-for-byte stable
+## for a fixed build, it simply runs against a different (pillar-free) field.
+## If a future change makes this check fail, it is a REAL default-path diff
+##
 ## The knob-dependent half of this file is wrapped in
 ## `when declared(loadTfilCommitEnv)` so the SAME file still compiles against
 ## the pre-change module and can regenerate the golden there. That is the whole
@@ -103,8 +111,11 @@ when defined(tfilGenGolden):
   block:
     let recs = replay(loadStates(), loadRoundStarts())
     var g = "# TFIL default-path parity golden.\n"
-    g.add "# Generated from commit f842ac0 (shipped mover, BEFORE the commit knobs)\n"
+    g.add "# Originally generated from commit f842ac0 (shipped mover, BEFORE the commit knobs).\n"
-    g.add "# by `nim c -r -d:tfilGenGolden` on this file against `git archive f842ac0`.\n"
+    g.add "# REGENERATED from the NEW default after the DELIBERATE removal of the virtual\n"
+    g.add "# centre pillar (PillarHotness/PillarRadiance 30/10 -> 0/0). Set\n"
+    g.add "# TR_TFIL_PILLAR_ON=1 to restore the old field. Not a regression: the shipped\n"
+    g.add "# default change is intentional, so the default path legitimately differs.\n"
     g.add "# Format: call speed turnRate targetX targetY commitTicks\n"
     for r in recs: g.add recLine(r) & "\n"
     createDir(goldenPath.parentDir)
@@ -115,6 +126,10 @@ when defined(tfilGenGolden):
 # ── 1. default-path parity against the pre-change build ──────────────────────
 
 proc testDefaultParity() =
+  # NOTE: the golden below was regenerated when the virtual centre pillar was
+  # removed from the shipped DEFAULT (DELIBERATE change, not an accidental
+  # regression — see the file header). With the pillar restored via
+  # TR_TFIL_PILLAR_ON=1 the old golden would no longer match, by design.
   doAssert fileExists(goldenPath), "missing golden: " & goldenPath
   let recs = replay(loadStates(), loadRoundStarts())
   var golden: seq[string]