release-kit 0.1.0

A canonical release workflow: a technology-agnostic method, per-technology bindings, and the rk CLI that lands and serves them.
Documentation 
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#!/usr/bin/env sh
# Make the trunk the default branch, so the bot's release request targets it
# with no configuration; the method's setup chapter owns the reasoning. A
# repository that has no trunk branch yet gets one at the current default's
# tip — the work is already there — and single-trunk retires the old name.
set -eu
: "${RK_REPO:?rk sets this; run this script through rk setup}"
: "${RK_TRUNK_BRANCH:?rk sets this; run this script through rk setup}"

if ! gh api "repos/$RK_REPO/git/ref/heads/$RK_TRUNK_BRANCH" >/dev/null 2>&1; then
  current="$(gh repo view "$RK_REPO" --json defaultBranchRef -q .defaultBranchRef.name)"
  sha="$(gh api "repos/$RK_REPO/git/ref/heads/$current" -q .object.sha)"
  gh api -X POST "repos/$RK_REPO/git/refs" \
    -f "ref=refs/heads/$RK_TRUNK_BRANCH" -f "sha=$sha" >/dev/null
  echo "ok $RK_TRUNK_BRANCH created at $current"
fi

gh repo edit "$RK_REPO" --default-branch "$RK_TRUNK_BRANCH"
echo "check: prints \"$RK_TRUNK_BRANCH\""
gh repo view "$RK_REPO" --json defaultBranchRef -q .defaultBranchRef.name