feat(ModularBot): pluggable bot with 4 guns, phantom meteor movement, radar harness

- Gun harness: virtual bullet tracker, rolling fitness, auto-selector
- Guns: head-on, linear (extrapolation), circular (integrated formula), tsetlin machine (learning)
- Movement: phantom meteor gravity engine (danger histograms, phantom bullets, fire detection)
- Radar: harness + radar_lock adapter
- Color-coded modules: turret/bullet color per gun, body per movement, scan per radar
- Beats Target, SpinBot, Crazy, TrackFire in 10-round battles

ModularBot_garage/tests/test_gun_diversity.nim

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+import std/os
+import std/strutils
+import test_framework/test_framework
+
+if not existsEnv("TR_SERVER_JAR") or not existsEnv("TR_BATTLE_RUNNER"):
+  echo "Skipping: TR_SERVER_JAR / TR_BATTLE_RUNNER not set"
+  quit(0)
+
+let modularBotDir = "/home/davide/Projects/SirRoboGarage/ModularBot_garage"
+let sampleBotsDir = "/home/davide/Downloads/robocode-tankroyale/sample-bots-nim-linux-1.0.7"
+
+echo "\n=== BATTLE 1: ModularBot vs SpinBot (Circular Movement) ==="
+let r1 = runBattle(@[modularBotDir, sampleBotsDir / "SpinBot"], rounds = 10)
+echo "\nBattle 1 Results:"
+for bot in r1.results:
+  echo "  " & bot.name & ": score=" & $bot.totalScore & " rank=" & $bot.rank
+echo "Winners: " & r1.winners.join(", ")
+
+echo "\n=== BATTLE 2: ModularBot vs Crazy (Unpredictable Movement) ==="
+let r2 = runBattle(@[modularBotDir, sampleBotsDir / "Crazy"], rounds = 10)
+echo "\nBattle 2 Results:"
+for bot in r2.results:
+  echo "  " & bot.name & ": score=" & $bot.totalScore & " rank=" & $bot.rank
+echo "Winners: " & r2.winners.join(", ")