feat(ui): show expected good failures as a green ✗ (#1140) #63

	name: Branch Sync Guard
	on:
	# Either side can break the invariant: a commit landing on main, or a
	# rewrite of staging that drops main's ancestry. Check on a push to either,
	# for an immediate signal that stays silent when nothing is wrong. The daily
	# run is a backstop for the window where this file is not yet on a branch (a
	# push trigger only fires for a workflow that exists on the pushed branch).
	push:
	branches: [main, staging]
	schedule:
	- cron: "23 7 * * *"
	workflow_dispatch: {}

	jobs:
	check:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	steps:
	- uses: actions/checkout@v5
	with:
	fetch-depth: 0
	- name: Assert main is an ancestor of staging
	run: \|
	set -euo pipefail
	git fetch origin main staging
	git merge-base --is-ancestor origin/main origin/staging \
	\|\| { echo "::error::main has commits not on staging — FF invariant broken. Recovery: rebuild staging on main so main-only commits survive — run the Sync Preflight workflow for the exact commands. Never force-push main."; exit 1; }
	echo "invariant holds"

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