guide: Google #53

	name: Go module guide validate

	# Pre-merge validation for guide/schema PRs: run the generator (meta parse,
	# aliases, append-only refs, assets, size) but do not require go/ to be synced.
	# Post-merge sync is handled by go-module-regen.
	on:
	pull_request:
	paths:
	- 'guides/**'
	- 'schema/**'
	- '.github/workflows/go-module-guide-validate.yml'

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

	- uses: actions/setup-go@v5
	with:
	go-version-file: go/go.mod
	cache-dependency-path: \|
	go/go.mod
	go/internal/gen/go.sum

	- name: Regenerate (validate only)
	working-directory: go/internal/gen
	run: go run .

	- name: Size budget
	run: \|
	set -euo pipefail
	size_kb="$(du -sk go/generated \| awk '{print $1}')"
	echo "go/generated size: ${size_kb} KiB"
	if [ "$size_kb" -gt 5120 ]; then
	echo "publishable payload exceeds 5 MiB budget"
	exit 1
	fi
	while IFS= read -r -d '' f; do
	bytes="$(wc -c < "$f")"
	if [ "$bytes" -gt 524288 ]; then
	echo "file exceeds 512 KiB: $f ($bytes bytes)"
	exit 1
	fi
	done < <(find go/generated -type f -print0)

	- name: Discard generated output
	run: git checkout -- go/ \|\| true

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