merge j160-ramfloor: the energy-reserve FIRING FLOOR + ENEMY-EXHAUSTION ram trigger (default off)

TR_RAM_FLOOR_ENERGY and TR_RAM_ENEMY_ENERGY, both default 0.0, plus
common_libs/movements/ram_decision.nim, the fire gate in ModularBot.nim, two
offline measure_* tools and the A/B record.

The j163 A/B (450 runs/arm, 0 env mis-set) is a clean negative: round-win
40.30% -> 39.70%, sign-flip p=0.7676, MDE 4.73 pp. DO NOT ADOPT;
TR_RAM_FLOOR_ENERGY stays 0.0. The mechanism barely fired (0.04% of ticks, not
the 9.6% the offline ruler predicted), so the null does not prove the knob
inert.

# Conflicts:
#	common_libs/tests/test_tfil_commit_env.nim

ModularBot_garage/.env.example

@@ -98,6 +98,8 @@ TR_RAM_PLAN=off            # the change-of-plan trigger (enemy outguns us while
 TR_RAM_PLAN_DIST=250.0     # px; max range at which the plan trigger may fire
 TR_RAM_PLAN_MARGIN=20.0    # energy advantage the plan trigger needs
 TR_RAM_PLAN_HITRATE=0.05   # pooled virtual hit rate below which the gun duel counts as failing
+TR_RAM_FLOOR_ENERGY=0.0    # j160 firing floor: at/below this self energy stop firing (0 = off)
+TR_RAM_ENEMY_ENERGY=0.0    # j160 exhaustion: last-scanned enemy energy <= this -> ram (0 = off)
 
 # ── movement internals: tfil (the floor-is-lava field) ──────────────────────
 TR_TFIL_RANGE_LO=100.0   # px; lower edge of the range band the ring mover prefers