add global-min-publish-age #1274

	name: Security Audit
	on:
	pull_request:
	paths: [Cargo.lock]
	push:
	branches: [main]
	paths: [Cargo.lock]
	schedule:
	- cron: '0 0 * * *'

	permissions:
	issues: write
	checks: write
	pull-requests: read
	contents: read

	jobs:
	security_audit:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v6
	- uses: taiki-e/install-action@43aecc8d72668fbcfe75c31400bc4f890f1c5853 # v2.83.2
	with:
	tool: cargo-audit
	- run: cargo audit
	# Stable cargo ignores the publish-age policy, so the lockfile can pin
	# too-young crates (or deliberately via `just update-allow`); surface them.
	- name: Check lockfile against the publish-age cooldown
	run: \|
	if ! rustup toolchain install nightly-2026-06-21 --profile minimal; then
	echo "::warning title=Publish-age cooldown check skipped::toolchain install failed"
	exit 0
	fi
	if ! cargo +nightly-2026-06-21 update --dry-run -Z min-publish-age > cooldown.txt 2>&1; then
	msg=$(head -20 cooldown.txt \| sed ':a;N;$!ba;s/\n/%0A/g') # %0A = newline in annotations
	echo "::warning title=Publish-age cooldown probe failed::$msg"
	exit 0
	fi
	hits=$(grep -E "Downgrading\|is too new" cooldown.txt \|\| true)
	if [ -n "$hits" ]; then
	count=$(echo "$hits" \| wc -l)
	msg=$(echo "$hits" \| head -20 \| sed ':a;N;$!ba;s/\n/%0A/g')
	echo "::warning title=Lockfile pins $count crate(s) younger than the publish-age cooldown::$msg"
	fi

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