The job title faded; the substrate skill did not. What survived from prompt engineering: authority hierarchies with evals behind them, prompts as interface contracts, and knowing which guarantees belong to the harness instead.
Advertised context windows are marketing; effective ones are 10-20% of that, with a valley in the middle. Context engineering is budgeting for the window you actually get — and never compacting without an addressable store.
Observable, deterministic meta-harness for local AI coding agents — supervises Codex and Claude Code through one control plane with static strategy selection, verifier-gated bounded loops, isolated Git worktrees, a durable event trace and the ACR-ARCH selector benchmark.