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chore: set up release-please, bump Node to >=21, disable darwin-x64 n… #1

	name: release-please

	# Maintains a single open "release PR" on main that bumps all workspace
	# versions, updates per-crate CHANGELOG.md files, and updates the
	# .release-please-manifest.json based on Conventional Commits since the
	# last release. Merging that PR creates a GitHub Release and a v{X.Y.Z}
	# tag.
	#
	# The downstream workflows trigger off the GitHub Release publish event
	# (release.yml → crates.io, npm-build-publish.yml → npm) rather than the
	# tag push. This avoids the GitHub Actions limitation where tags pushed
	# by GITHUB_TOKEN don't fire `on: push: tags:` workflows — which would
	# otherwise require a custom PAT.
	#
	# Maintainers don't run anything by hand:
	# 1. Land conventional-commit PRs into main.
	# 2. Merge the release-please PR when ready to ship.
	#
	# See docs/GITHUB_OPERATIONS.md → "Cutting a release" for details.

	on:
	push:
	branches: [main]
	workflow_dispatch: {}

	permissions:
	contents: write
	pull-requests: write

	jobs:
	release-please:
	runs-on: ubuntu-latest
	steps:
	- uses: googleapis/release-please-action@v4
	with:
	config-file: release-please-config.json
	manifest-file: .release-please-manifest.json