Preserve initial frontend pattern language research scaffold

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a0cffe-206f-7323-89d3-b20ca4cf4bf9

canon/Scales.md

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+# Scales
+
+Patterns operate at different architectural scales.
+
+## L0 — Experience / Product
+
+Concerns the overall interactive system experienced by a user.
+
+Examples:
+
+- collaborative editor,
+- transactional workflow,
+- content publication,
+- offline field application.
+
+## L1 — Application Topology
+
+Large-scale application organization.
+
+Examples:
+
+- independently deployable frontend,
+- application shell,
+- frontend/backend partitioning.
+
+## L2 — Authority & Distribution
+
+Placement and replication of authoritative state.
+
+Examples:
+
+- server authority,
+- local authority,
+- replicated authority.
+
+## L3 — Navigation & Projection
+
+Addressability, routing, rendering and delivery of perceivable state.
+
+Examples:
+
+- URL as state,
+- server projection,
+- client projection,
+- streaming projection.
+
+## L4 — Feature / Domain Boundaries
+
+Functional decomposition.
+
+Examples:
+
+- vertical feature slice,
+- bounded frontend feature,
+- backend for frontend.
+
+## L5 — Components
+
+Reusable interaction and presentation structures.
+
+Examples:
+
+- presentation model,
+- compound component,
+- controlled component.
+
+## L6 — Interaction & State
+
+Fine-grained interaction behavior.
+
+Examples:
+
+- local interaction state,
+- optimistic overlay,
+- pending state.
+
+## L7 — Elements / Implementation
+
+Low-level implementation structures.
+
+Examples:
+
+- lazy boundary,
+- error boundary,
+- focus restoration.
+
+## Rule
+
+Patterns from different scales may relate strongly, but should not be treated as equivalent alternatives merely because they are all called "frontend patterns".