chore: remove obsolete manual-publish paths (release.sh, /publish skill)

Releases now go through .github/workflows/release.yml, which builds the bundles
and publishes the npm thin-installer. The old manual paths published the root
(non-bundled) package, which would break Node < 22.5 users — remove them so they
can't be run by accident. CLAUDE.md + add-lang updated to point at the workflow.
scripts/extract-release-notes.mjs is kept (the workflow uses it).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/release.sh

@@ -1,68 +0,0 @@
-#!/usr/bin/env bash
-# Tag the current commit with the version in package.json and publish a
-# matching GitHub Release whose body is the corresponding CHANGELOG.md entry.
-#
-# Run AFTER you have:
-#   - bumped package.json
-#   - added a `## [X.Y.Z] - YYYY-MM-DD` block at the top of CHANGELOG.md
-#   - committed, pushed to origin, and run `npm publish`
-#
-# Idempotent: safe to re-run after a partial failure. Skips steps that are
-# already done (tag created, tag pushed, release published).
-#
-# Usage: ./scripts/release.sh
-
-set -euo pipefail
-
-cd "$(dirname "$0")/.."
-
-VERSION=$(node -p "require('./package.json').version")
-TAG="v${VERSION}"
-
-REPO=$(git remote get-url origin | sed -E 's|.*github\.com[:/]||; s|\.git$||')
-if [ -z "${REPO}" ]; then
-  echo "error: could not derive owner/repo from origin remote URL" >&2
-  exit 1
-fi
-
-if ! grep -q "^## \[${VERSION}\]" CHANGELOG.md; then
-  echo "error: no '## [${VERSION}]' entry found in CHANGELOG.md" >&2
-  exit 1
-fi
-
-# Extract notes with paragraph unwrapping — GitHub Releases render with
-# GFM hard-breaks, so the CHANGELOG's hard-wrapped lines would show as
-# visible `<br>` breaks otherwise. The helper joins continuation lines
-# into a single line per bullet.
-NOTES=$(node scripts/extract-release-notes.mjs "${VERSION}")
-
-if [ -z "${NOTES}" ]; then
-  echo "error: failed to extract changelog notes for ${VERSION}" >&2
-  exit 1
-fi
-
-if git rev-parse "${TAG}" >/dev/null 2>&1; then
-  echo "✓ tag ${TAG} already exists locally"
-else
-  echo "→ tagging ${TAG}"
-  git tag "${TAG}"
-fi
-
-if git ls-remote --exit-code --tags origin "${TAG}" >/dev/null 2>&1; then
-  echo "✓ tag ${TAG} already on origin"
-else
-  echo "→ pushing ${TAG} to origin"
-  git push origin "${TAG}"
-fi
-
-if gh release view "${TAG}" --repo "${REPO}" >/dev/null 2>&1; then
-  echo "✓ release ${TAG} already published"
-else
-  echo "→ creating GitHub Release ${TAG} on ${REPO}"
-  gh release create "${TAG}" \
-    --repo "${REPO}" \
-    --title "${TAG}" \
-    --notes "${NOTES}"
-fi
-
-echo "done: https://github.com/${REPO}/releases/tag/${TAG}"