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Fix the /ai-debate demo's second turn and mid-sentence rebuttals #131

	name: Staging preview note

	# Staging runs main's backend (docs/staging.md). A PR that opens with
	# changes to supabase/ gets a comment saying its staging preview still uses
	# main's migrations and Edge Functions until it merges.

	on:
	pull_request:
	# The note posts once, so later pushes have nothing to add.
	types: [opened, reopened]
	paths:
	- "supabase/migrations/**"
	- "supabase/functions/**"

	permissions:
	pull-requests: write

	jobs:
	note:
	if: github.event.pull_request.head.repo.full_name == github.repository
	runs-on: ubuntu-latest
	timeout-minutes: 2
	steps:
	- name: Comment once
	env:
	GH_TOKEN: ${{ github.token }}
	PR: ${{ github.event.pull_request.number }}
	shell: bash
	run: \|
	marker="<!-- staging-preview-note -->"
	# Read every comment first: grep -q exiting early would SIGPIPE gh, and
	# under pipefail that reads as "no marker" and posts a duplicate.
	bodies="$(gh api "repos/${GITHUB_REPOSITORY}/issues/${PR}/comments" --paginate --jq '.[].body')"
	if grep -qF "$marker" <<< "$bodies"; then
	exit 0
	fi
	gh pr comment "$PR" --repo "$GITHUB_REPOSITORY" --body "$marker
	This PR changes \`supabase/\`. Its debatelab-staging preview talks to staging, which runs main's migrations and Edge Functions, so this PR's backend changes are not there yet. The VPS staging sync applies them within about 5 minutes of the merge. To try them before merging, use the \`verify-debatelab\` skill against a local stack. See docs/staging.md."