chore: standardize Nim builds to out/ subdir, simplify .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SAC_LSTM_Bot_garage/SAC_LSTM_Bot.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 # Launch config for tools/training_runner/RunTraining.java (#49): the runner
 # executes <json-basename>.sh inside the bot dir (sample-bots convention).
-exec "$(dirname "$0")/SAC_LSTM_Bot"
+exec "$(dirname "$0")/out/SAC_LSTM_Bot"

SAC_LSTM_Bot_garage/config.nims

@@ -5,6 +5,7 @@ switch("passL", "-L/nix/store/v07svn2y92bvzjl51aj7c9ca1cwg7rw7-openblas-0.3.32/l
 # ponytail: nix store path; adjust per machine, or use pkg-config
 switch("passL", "-L/nix/store/wqvz31s598bvj3zb747943xhl38hjc6h-libzip-1.11.4/lib -lzip")
 switch("threads", "on")
+switch("outdir", "out")
 # Submodules import each other as SAC_LSTM_Bot/<mod>; make that resolvable for
 # the binary build too (tests already add ../src via tests/config.nims).
 switch("path", thisDir() & "/src")

SAC_LSTM_Bot_garage/make_twin.sh

@@ -17,7 +17,7 @@ set -euo pipefail
 
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 TARGET="${1:-${SAMPLE_BOTS_DIR:-/home/davide/Projects/tank-royale/sample-bots/java/build/archive}}/SacTwin"
-BIN="$SCRIPT_DIR/SAC_LSTM_Bot"          # nimble build -d:release output
+BIN="$SCRIPT_DIR/out/SAC_LSTM_Bot"      # nimble build -d:release output (out/ subdir)
 SEED="$SCRIPT_DIR/weights/sac_best.zip" # frozen baseline
 
 [ -x "$BIN" ]   || { echo ">>> $BIN missing — run 'nimble build -d:release' first"; exit 1; }