STRAFE: draw the heat field, real bullet danger, corrected ring comment

Three defects the owner hit as "no heat tiles anymore" under TR_MOVEMENT=strafe.

1. The strafe overlay drew ONLY the tiles on its strafe line, so the computed
   heat field was essentially invisible. It now draws the WHOLE field exactly as
   TFIL does (every non-zero tile, yellow->orange->red ramp by field max, integer
   value label) behind the same debugGraphics flag, with TR_STRAFE_HEAT_GRID=0 to
   hide it. The strafe overlays draw on top, unchanged.

2. STRAFE carried the SHIPPED bullet constants (core 10 / aura 5), so a bullet's
   own heat sat exactly ON PathDangerThreshold (10.0) and a bullet was never
   dangerous on its own in this mover; it only ever bit through its corridor.
   Defaults are now the retune's 20/10, exposed as TR_STRAFE_BULLET_CORE /
   TR_STRAFE_BULLET_AURA.

3. The ring mover's header documented CorridorHeat 5.0 / WallHotness 10.0 while
   the code has always been 10.0 / 15.0. A job read the comment and handed out
   sub-threshold heat values, which emptied the field. The comment now states the
   real values and their actual behaviour; no code values changed.

Also sets strafe's heat defaults to the retune shape (bullet 20/10, corridor 10,
wall 15/5, pillar 0), documented with the reason.

Gate A re-run (j110, offline DrussGT fixture, measure_strafe_gates.nim):
  corrected DEFAULT : 24.6% of picks with ZERO safe tile, mean 11.17 safe
  j108 shipped field: 63.4% / 3.70   (reproduced exactly)
  j108 ring retune  :  8.1% / 18.41  (reproduced exactly)
  bullet isolated   : 11.4% / 17.07
The corrected default beats the shipped field but is WORSE than j108's retune
row: the bullet retune alone costs 8.1 -> 11.4, the corridor/wall retune accounts
for the rest. That is the deliberate price of making a bullet dangerous.

Guards green: test_env_report 24 PASS, test_tfil_commit_env 30 PASS (shipped TFIL
default untouched, byte-for-byte), test_tfil_ring_weights 24 PASS. The three new
knobs are registered in the boot env report so the tree-scan guard stays clean.

ModularBot_garage/src/env_report.nim

@@ -272,8 +272,12 @@ proc printEffectiveValues(ctx: EnvReportContext) =
   emit("TR_STRAFE_DWELL_MIN", $StrafeDwellMin, sourceOf("TR_STRAFE_DWELL_MIN"))
   emit("TR_STRAFE_DWELL_MAX", $StrafeDwellMax, sourceOf("TR_STRAFE_DWELL_MAX"))
   emit("TR_STRAFE_LOG", onOff(StrafeLog), sourceOfPresence("TR_STRAFE_LOG"))
-  # STRAFE's heat shape is override-able (default = the shipped TFIL field) so
-  # the shipped field and the ring retune can be A/B'd on one binary at boot.
+  emit("TR_STRAFE_HEAT_GRID", onOff(StrafeHeatGrid), sourceOf("TR_STRAFE_HEAT_GRID"))
+  # STRAFE's heat shape is its own RETUNE (bullet 20/10, corridor 10, wall
+  # 15/5), override-able per run so the shipped field can be A/B'd on one
+  # binary at boot.
+  emit("TR_STRAFE_BULLET_CORE", $StrafeBulletCore, sourceOf("TR_STRAFE_BULLET_CORE"))
+  emit("TR_STRAFE_BULLET_AURA", $StrafeBulletAura, sourceOf("TR_STRAFE_BULLET_AURA"))
   emit("TR_STRAFE_CORRIDOR_HEAT", $StrafeCorridorHeat, sourceOf("TR_STRAFE_CORRIDOR_HEAT"))
   emit("TR_STRAFE_WALL_HOTNESS", $StrafeWallHotness, sourceOf("TR_STRAFE_WALL_HOTNESS"))
   emit("TR_STRAFE_WALL_RADIANCE", $StrafeWallRadiance, sourceOf("TR_STRAFE_WALL_RADIANCE"))
@@ -431,6 +435,7 @@ proc knownEnvNames*(): seq[string] =
     "TR_TFIL_PILLAR_ON",
     "TR_STRAFE_BAND", "TR_STRAFE_SPREAD", "TR_STRAFE_REACH",
     "TR_STRAFE_DWELL_MIN", "TR_STRAFE_DWELL_MAX", "TR_STRAFE_LOG",
+    "TR_STRAFE_HEAT_GRID", "TR_STRAFE_BULLET_CORE", "TR_STRAFE_BULLET_AURA",
     "TR_STRAFE_CORRIDOR_HEAT", "TR_STRAFE_WALL_HOTNESS",
     "TR_STRAFE_WALL_RADIANCE",
     # harness vars (read by the test framework, inherited by the bot, so they