Add justfile for recurring commands

justfile

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+RELEASE_DIR := "target/release"
+CUTECHESS_CLI_DIR := "$(pwd)/../cutechess-cli"
+
+# Run all tests
+test-all:
+    cargo test -r
+
+# Run all tests except the perft suite
+test:
+    cargo test -r -- --skip perft
+
+# Run only the perft suite
+test-perft:
+    cargo test -r perft
+
+# Re-run tests (minus perft) on every change under src/
+watch:
+    cargo watch -c -w src -x 'test -r -- --skip perft'
+
+# Build, rotate current zeal -> zeal-old, install new as zeal (for SPRT).
+release-switch:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    cargo b -r
+    mv {{CUTECHESS_CLI_DIR}}/zeal {{CUTECHESS_CLI_DIR}}/zeal-old
+    cp {{RELEASE_DIR}}/zeal {{CUTECHESS_CLI_DIR}}/zeal
+
+# Build and install as zeal (no old-version rotation; for non-SPRT runs)
+release:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    cargo b -r
+    cp {{RELEASE_DIR}}/zeal {{CUTECHESS_CLI_DIR}}/zeal
+
+# Run SPRT tests between 2 zeal versions
+run-sprt concurrency="1":
+    #!/usr/bin/env bash
+    set -euo pipefail
+    cd {{CUTECHESS_CLI_DIR}}
+    ./cutechess-cli \
+        -engine cmd=./zeal name="zeal-new" proto=uci \
+        -engine cmd=./zeal-old name="zeal-old" proto=uci \
+        -openings file="8moves_v3.pgn" order=random format=pgn \
+        -concurrency {{concurrency}} \
+        -ratinginterval 100 \
+        -games 10000 \
+        -resign movecount=3 score=400 \
+        -draw movenumber=40 movecount=3 score=10 \
+        -repeat \
+        -each tc=8+0.08 \
+        -sprt elo0=0 elo1=10 alpha=0.05 beta=0.1 \
+        -pgnout "$(pwd)/games.pgn" 2>&1 | tee {{CUTECHESS_CLI_DIR}}/sprt_log.txt
+
+# Run SPRT tests between 2 zeal versions with debug LOG enabled (10 games)
+run-debug:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    cd {{CUTECHESS_CLI_DIR}}
+    ./cutechess-cli \
+        -engine cmd=./zeal name="zeal-new" proto=uci \
+        -engine cmd=./zeal-old name="zeal-old" proto=uci \
+        -openings file="8moves_v3.pgn" order=random format=pgn \
+        -concurrency 1 \
+        -ratinginterval 100 \
+        -games 10 \
+        -resign movecount=3 score=400 \
+        -draw movenumber=40 movecount=3 score=10 \
+        -repeat \
+        -each tc=8+0.08 \
+        -sprt elo0=0 elo1=10 alpha=0.05 beta=0.1 \
+        -pgnout "$(pwd)/games.pgn" \
+        -debug \
+        2> "$(pwd)/debug_log.txt"
+
+# Run tests between zeal and a stash version
+run-ccrl:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    cd {{CUTECHESS_CLI_DIR}}
+    ./cutechess-cli \
+        -engine cmd=./zeal name="zeal" proto=uci \
+        -engine cmd=./stash-15.0-linux-64 name="stash-15.0-linux-64" proto=uci \
+        -openings file="8moves_v3.pgn" order=random format=pgn \
+        -concurrency 6 \
+        -ratinginterval 100 \
+        -games 2000 \
+        -resign movecount=3 score=400 \
+        -draw movenumber=40 movecount=3 score=10 \
+        -repeat \
+        -each tc=8+0.08