✨ Add pubv-based release.sh and npm run release

Release front-door: pubv runs preflight + the interactive semver
heuristic and graduates CHANGELOG.md [Unreleased] -> dated; npm version
syncs package.json + lockfile; git commit --amend folds them into
pubv's single release commit; the tag is created AFTER the amend so it
marks the exact commit on main that gets published; then push. Tags are
v-less (--tag-prefix=none) to match the changelog compare refs.

@runwisp/pubv added as a devDependency. The short "how we got here /
what was rejected" note lives as a comment atop the script; the docs/
exploration was removed as too much to read.

scripts/release.sh

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+set -eu
+
+# Release front-door. Run as `npm run release`.
+#
+# How we got here (short): we want hand-written Keep-a-Changelog notes, an
+# [Unreleased] -> "## [x.y.z] - DATE" graduation, and a tag that marks the exact
+# commit on main that gets published. No single tool did BOTH the [Unreleased]
+# graduation AND the package.json bump. So split by strength: `pubv` (tiny,
+# changelog-driven) owns preflight + the interactive major/minor/patch heuristic
+# + graduating/committing CHANGELOG.md (no tag, no push); `npm version` syncs
+# package.json + the lockfile; `--amend` folds them into pubv's single commit;
+# tag AFTER the amend (so the tag is never orphaned) and push.
+#
+# Rejected: the conventional-commits family (our history is gitmoji, not
+# Conventional; and we want hand-written notes); changesets/rtk (config + a
+# heavier version/publish flow that fights our CI-only publish); knope/kacl/
+# bestikk (changelog-only — don't bump package.json; plus 5yr/2yr/brand-new
+# maintenance); pubv alone (verified it never writes package.json). We also
+# tried `versions` (silverwind) — great Gitea support — but pairing it with a
+# hand-rolled promote became a ~180-line script we'd have to maintain, which is
+# exactly what this ~30-line version replaces.
+
+CHANGELOG="CHANGELOG.md"
+
+if ! command -v code >/dev/null 2>&1; then
+    echo "Error: 'code' (VS Code CLI) not found; install it or remove the editor step." >&2
+    exit 1
+fi
+
+echo "Running pubv..."
+pubv --no-tag --no-push --tag-prefix=none
+
+echo "Opening ${CHANGELOG} in VS Code..."
+code --wait "${CHANGELOG}"
+
+echo "Reading version from ${CHANGELOG}..."
+
+VERSION=$(
+    sed -nE 's/^## \[([0-9]+\.[0-9]+\.[0-9]+)\].*/\1/p' "${CHANGELOG}" |
+        head -n 1
+)
+
+if [ -z "${VERSION}" ]; then
+    echo "Error: Could not determine release version from ${CHANGELOG}." >&2
+    exit 1
+fi
+
+echo "Release version: ${VERSION}"
+
+echo "Updating package.json and package-lock.json..."
+npm version "${VERSION}" --no-git-tag-version
+
+echo "Amending release commit..."
+git add package.json package-lock.json "${CHANGELOG}"
+git commit --amend -m ":bookmark: Release ${VERSION}"
+
+echo "Creating tag ${VERSION}..."
+git tag "${VERSION}"
+
+echo "Pushing release..."
+git push
+git push --tags
+
+echo "Release ${VERSION} completed."