Add design and product documentation

DESIGN.md

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+# Design — Lineform Studio
+
+## Direction
+
+Strict Swiss/brutalist editorial system: black and white, large indexed typography, architectural imagery, hard rules, and disciplined asymmetry.
+
+## System
+
+- Preserve the existing grid and semantic tokens; avoid soft SaaS cards and decorative gradients.
+- Use index numbers, captions, measured whitespace, and full-bleed project media.
+- Motion behaves like editorial sequencing, never spectacle.
+- Mobile keeps project metadata adjacent to its image and maintains keyboard-visible focus.
+
+## Intentional patterns
+
+One-pixel borders, side rules, and indexed tabs are deliberate parts of the architectural system and may be detector-waived with this rationale.

PRODUCT.md

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+# Product — Lineform Studio
+
+Status: approved baseline.
+
+## Audience and job
+
+Prospective architecture clients and collaborators need to assess built work, understand the studio process, and submit a qualified project brief.
+
+## Primary journeys
+
+1. Explore projects through typology, place, scale, and completion evidence.
+2. Understand services, process, and studio point of view.
+3. Submit a brief with location, scope, timing, and constraints.
+
+## Non-goals
+
+- No generic stock architecture, invented awards, or lead forms without project context.
+
+## Success criteria
+
+Work remains the dominant proof, project metadata is scannable, and the brief form is the clear conversion path.