Updated the following docs to reference the Rig/Cook/Run lifecycle:
- propulsion-principle.md: Added lifecycle overview, updated steam metaphor table
- sling-design.md: Added see-also reference to molecular-chemistry.md
- molecules.md: Added lifecycle summary diagram, formula context
- architecture.md: Added Rig/Cook/Run overview, added Formula to concepts table
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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