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merge fix/show-tail: show walks back from the tail #7

	# ci.yml: the same gate scripts/release.sh runs locally before it will cut a
	# tag (go build / vet / test), run on every push and PR so the gate is never
	# the first place a break is discovered.
	name: ci

	on:
	push:
	branches: ["**"]
	pull_request:

	permissions:
	contents: read

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-go@v5
	with:
	go-version-file: go.mod
	cache: true

	- name: build
	# CGO off everywhere, so CI cannot pass on a binary the release path
	# would never produce (agents.md invariant #11).
	env:
	CGO_ENABLED: "0"
	run: go build ./...

	- name: vet
	env:
	CGO_ENABLED: "0"
	run: go vet ./...

	- name: test
	env:
	CGO_ENABLED: "0"
	run: go test ./...