Added stash install script

Author: Timmoth

PerftWar/engines/stash-bot.json

@@ -0,0 +1,20 @@
+{
+  "name": "stash-bot",
+  "version": "master",
+  "owner": "mhouppin",
+  "repo": "https://github.com/mhouppin/stash-bot",
+  "language": "C",
+  "_note": "Stash is a UCI engine; perft is routed through `go perft N` and uses movelist_size as a depth-1 bulk count. Build with NATIVE=yes for movegen speed (per upstream guidance — the default Makefile may pick a sub-optimal arch flag set otherwise).",
+  "modes": {
+    "single-no-cache": {
+      "launch": "bin/stash-bot/src/stash",
+      "setup": [
+        "setoption name Threads value 1",
+        "setoption name Hash value 1"
+      ],
+      "case":   "position fen {fen}\ngo perft {depth}",
+      "end_re": "^info nodes \\d+",
+      "quit":   "quit"
+    }
+  }
+}

PerftWar/scripts/install-stash-bot.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+# Clone, build, and verify stash-bot → bin/stash-bot/src/stash.
+#
+# Stash (Morgan Houppin) is a UCI engine in C. The repo's README says:
+#   - Source is under src/
+#   - Plain `make` autodetects arch flags, BUT
+#   - `make NATIVE=yes` enables ALL available instruction sets on the host,
+#     which matters for movegen speed (the README and upstream maintainer
+#     explicitly call this out).
+# We always pass NATIVE=yes here since PerftWar runs the binary on the
+# same host that built it.
+
+ENGINE="stash-bot"
+REPO="https://github.com/mhouppin/stash-bot"
+ENGINE_DIR="bin/stash-bot"
+BINARY="$ENGINE_DIR/src/stash"
+
+# shellcheck source=_common.sh
+source "$(cd "$(dirname "$0")" && pwd)/_common.sh"
+
+# --- Preflight -------------------------------------------------------------
+command -v gcc >/dev/null 2>&1 || command -v clang >/dev/null 2>&1 \
+  || die "neither gcc nor clang found"
+command -v make >/dev/null 2>&1 || die "make not found"
+
+# --- Clone + build ---------------------------------------------------------
+clone_or_keep "$ENGINE_DIR" "$REPO"
+
+HOST=$(detect_host)
+log "building (host=$HOST, cd src && make NATIVE=yes)"
+(
+  cd "$ENGINE_DIR/src"
+  make NATIVE=yes
+)
+
+[ -x "$BINARY" ] || die "expected binary at $BINARY but it's missing"
+
+out=$(verify_perft "$BINARY") || die "perft test failed"
+
+version=$(detect_version "$out")
+if [ -n "$version" ]; then
+  log "UCI banner: $version"
+  log "→ consider setting engines/$ENGINE.json's \"version\" to: $version"
+fi
+commit=$(git -C "$ENGINE_DIR" rev-parse --short HEAD 2>/dev/null || echo "")
+[ -n "$commit" ] && log "stash-bot commit: $commit"
+
+log "done. launch: $BINARY"