feat(ModularBot): decay-GF gun (recency-weighted), 13 guns total

- Decay-GF: exponential decay on GF histogram (0.998/tick, ~350-tick half-life)
- Adapts faster to mid-battle strategy changes than standard GF
- Battle-tested vs WaveSurfer, Crazy, RandomMover

test_decaygf_battles.nim

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+import std/[os, strformat]
+import common_libs/test_framework/test_framework
+
+const
+  modularBotDir = "/home/davide/Projects/SirRoboGarage/ModularBot_garage"
+  samplesDir    = "/home/davide/Downloads/robocode-tankroyale/sample-bots-nim-linux-1.0.7"
+  crazy         = samplesDir / "Crazy"
+  waveSurfer    = "/home/davide/Projects/SirRoboGarage/WaveSurfer_garage"
+  randomMover   = "/home/davide/Projects/SirRoboGarage/RandomMover_garage"
+
+const serverJar = "/home/davide/Projects/tank-royale/server/build/libs/robocode-tankroyale-server-0.35.5-all.jar"
+const runnerJar = "/home/davide/Projects/tank-royale/runner/examples/lib/robocode-tankroyale-runner.jar"
+
+if not fileExists(serverJar) or not fileExists(runnerJar):
+  echo "Skipping: Tank Royale JARs not found"
+  quit(0)
+
+proc battle(name: string, dir: string) =
+  echo fmt"--- ModularBot vs {name} (10 rounds) ---"
+  let r = runBattle(@[modularBotDir, dir], rounds = 10, timeout = 300000, maxSpeed = true)
+  for result in r.results:
+    echo fmt"  {result.name}: score={result.totalScore} rank={result.rank}"
+  echo ""
+
+battle("WaveSurfer",  waveSurfer)
+battle("Crazy",       crazy)
+battle("RandomMover", randomMover)