Loop — the engineering cycle: select, advance, distill, deliver

Rule content lives in the four files below; this SKILL.md only routes (doctrine/04-maintenance.md governs edits to this bundle too).

Route by moment

You are about to…	Read (in this folder)
Start a session; choose the next unit; size it; decide who/which tier runs it	select.md
Push a unit forward; wonder if you're stalled; pace an unattended run	advance.md
Decide where a learning goes — lesson, memory, project-level skill, or nowhere	distill.md
Claim a unit done; commit; report; end the session	deliver.md

A full pass is select.md → advance.md → distill.md → deliver.md, once per unit of work; re-enter at select.md §5 after each landing.

Scope and neighbors

This bundle is the outer cycle that sequences the others across a session and a project. Whether/how to delegate and judge (escalate, done-gate, ask-user) is doctrine; how to work a problem once inside a unit (investigate, design, execute, verify, write) is methods; domain judgment is the matching domain bundle. When this bundle and doctrine both fire, doctrine first — its three non-negotiables apply inside every phase of the loop.

The stance

A project advances as a sequence of landed loops, and compounds only if each loop distills. Progress is landed deliverables, not activity (advance.md §3); the next session's speed is this session's runway (deliver.md §4); and the institution grows one filed learning at a time (distill.md §1) — that is how weak sessions get strong.