Add release script

scripts/release.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+set -eu
+
+[ "$#" -eq 1 ] || { echo "Usage: $0 VERSION" >&2; exit 1; }
+version=${1#v}
+cd "$(dirname "$0")/.."
+
+[ "$(git branch --show-current)" = main ] || { echo "Run from main." >&2; exit 1; }
+[ -z "$(git status --porcelain)" ] || { echo "Commit or stash changes first." >&2; exit 1; }
+if git show-ref --verify --quiet "refs/tags/v$version"; then
+    echo "Tag v$version already exists." >&2
+    exit 1
+fi
+
+artifacts=$(mktemp -d)
+trap 'rm -rf "$artifacts"' EXIT
+
+python3 - "$version" <<'PY'
+import re
+import sys
+from pathlib import Path
+
+path = Path("great_ai/__init__.py")
+source = path.read_text()
+current = re.search(r'^__version__ = "([^"]+)"$', source, re.MULTILINE)
+version = sys.argv[1]
+if not re.fullmatch(r"(0|[1-9][0-9]*)(\.(0|[1-9][0-9]*)){2}", version):
+    sys.exit("Version must have X.Y.Z format.")
+if current is None or tuple(map(int, version.split("."))) <= tuple(map(int, current[1].split("."))):
+    sys.exit("Version must be greater than the current package version.")
+path.write_text(source[:current.start(1)] + version + source[current.end(1):])
+PY
+
+uv build --python 3.13 --out-dir "$artifacts"
+git commit --only -m "Release $version" -- great_ai/__init__.py
+git tag -a "v$version" -m "Release $version"
+git push --atomic origin HEAD:refs/heads/main "refs/tags/v$version"