scripts/measure-journal-read.ts builds two synthetic 120 MiB parent journals
around a real /autoplan invocation (mixed: ~28k records, most bytes inside
the invocation; large-invocation: ~89k records with a current invocation of
many small records), keeps appending while the guard reads, and measures one
hook call in a fresh process (wall ms, peak RSS). The workflow runs it on
ubuntu-latest and macos-latest on workflow_dispatch only.
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>