zsh-bench Integration

Proper benchmarking of interactive zsh using romkatv/zsh-bench. Measures real user-visible latency, NOT time zsh -lic exit (which is meaningless).

Commands

hey zbench              # Run + display with threshold indicators (auto-compares if baseline exists)
hey zbench-save         # Run + save as baseline + append history
hey zbench-compare      # Run + explicit diff against baseline
hey zbench-check        # Exit non-zero if over threshold (for git bisect)
hey zbench-baseline     # Show saved baseline (no run)
hey zbench-history      # Show TSV history

All commands accept extra zsh-bench args: hey zbench --iters 4 for quick runs.

Metrics & Thresholds