Mandatory protocol for all pi (gpt-5.6-sol) delegation — one-off `pi` CLI calls and every workflow subagent (pi in a surfaced herdr pane via a sonnet bridge). Load BEFORE writing a Workflow script, spawning workflow workers, delegating to pi/gpt-5.6-sol, or driving herdr panes. Covers pi invocation, pane placement, report harvesting, and failure handling.
