feat(ModularBot): acceleration predictor gun, 9 guns total

- Accel gun: tracks velocity+heading changes, extrapolates with acceleration
- Handles speed-up, slow-down, and combined accel+turn
- Battle-tested vs Crazy, RandomMover, Walls

ModularBot_garage/tests/test_accel_gun.nim

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+## Test AccelGun: 3 battles vs Crazy, RandomMover, Walls — 10 rounds each.
+## Run with: nim c -r --path:../../common_libs tests/test_accel_gun.nim
+
+import std/[os, strformat]
+import test_framework/test_framework
+
+const
+  modularBotDir  = currentSourcePath().parentDir.parentDir
+  samplesDir     = "/home/davide/Downloads/robocode-tankroyale/sample-bots-nim-linux-1.0.7"
+  crazyDir       = samplesDir / "Crazy"
+  wallsDir       = samplesDir / "Walls"
+  randomMoverDir = "/home/davide/Projects/SirRoboGarage/RandomMover_garage"
+
+if not fileExists("/home/davide/Projects/tank-royale/server/build/libs/robocode-tankroyale-server-0.35.5-all.jar") or
+   not fileExists("/home/davide/Projects/tank-royale/runner/examples/lib/robocode-tankroyale-runner.jar"):
+  echo "Skipping: Tank Royale JARs not found"
+  quit(0)
+
+proc runAndReport(label, enemyName, enemyDir: string) =
+  echo fmt"\n=== {label} ==="
+  let r = runBattle(@[modularBotDir, enemyDir], rounds = 10, timeout = 180000)
+  var mbScore = 0
+  var enScore = 0
+  for b in r.results:
+    if b.name == "ModularBot": mbScore = b.totalScore
+    if b.name == enemyName:    enScore = b.totalScore
+  let winner = if mbScore > enScore: "ModularBot" else: enemyName
+  echo fmt"  ModularBot: {mbScore}  {enemyName}: {enScore}  → {winner} wins"
+  echo fmt"  Rounds: {r.rounds.len}"
+
+runAndReport("Battle 1/3: vs Crazy",       "Crazy",       crazyDir)
+runAndReport("Battle 2/3: vs RandomMover",  "RandomMover", randomMoverDir)
+runAndReport("Battle 3/3: vs Walls",        "Walls",       wallsDir)
+echo "\nAccelGun gauntlet complete."