Add release script wrapping cargo release

[pthurlow]

No description provided.

[claude]

open is macOS-only. With set -euo pipefail, this will cause the script to error-exit on Linux after the PR is already created — leaving the user with a confusing failure despite the PR succeeding.

Use a cross-platform helper:

Suggested change

	open "$PR_URL"
	if command -v xdg-open &>/dev/null; then
	xdg-open "$PR_URL"
	elif command -v open &>/dev/null; then
	open "$PR_URL"
	fi

[claude]

Consider calling require_clean_tree before checking out the new branch. cargo release will modify Cargo.toml/CHANGELOG.md, so starting from a dirty tree can produce confusing diffs or cause cargo-release to abort mid-run.

Suggested change

	git checkout -b "$BRANCH"
	require_clean_tree
	git checkout -b "$BRANCH"

[claude]

Review

Issues

• scripts/release.sh:54 — open "$PR_URL" is macOS-only. With set -euo pipefail, this causes the script to error-exit on Linux after the PR has already been created, leaving the user with a misleading failure. Fix: use a cross-platform xdg-open/open fallback (see inline comment).

• scripts/release.sh:38 — prepare is missing a require_clean_tree call before modifying the repo. finish has this guard but prepare doesn't, even though it runs cargo release which edits Cargo.toml and CHANGELOG.md. A dirty tree risks confusing diffs or an unexpected mid-run abort from cargo-release.

Action Required

1. Fix open "$PR_URL" to work cross-platform (or wrap in a best-effort with || true at minimum to avoid failing after a successful PR creation).
2. Add require_clean_tree at the top of the prepare branch before git checkout -b.