Draft capability entry (reuse-surface REUSE-WP-0017-T04, cohort 3)

Honest first-pass maturity vector grounded in README/docs/tests present
in this repo; no invented evidence. Flagged for human review before
publish. See reuse-surface history/2026-07-06-coverage-classification.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

registry/indexes/capabilities.yaml

@@ -1,4 +1,22 @@
 version: 1
-updated: '2026-06-16'
+updated: '2026-07-06'
 domain: helix_forge
-capabilities: []
+capabilities:
+- id: capability.design.whynot-system
+  name: Whynot Design System
+  summary: 'Framework-agnostic visual language for whynot prototype/market-signal artefacts: design tokens,
+    drop-in CSS, Lit-based web components usable from React/Django/Vue/plain HTML, and Django template
+    adapters.'
+  vector: D3 / A2 / C2 / R1
+  domain: consumer
+  status: draft
+  owner: whynot-design
+  path: registry/capabilities/capability.design.whynot-system.md
+  tags:
+  - design-system
+  - web-components
+  - frontend
+  consumption_modes:
+  - library import (npm)
+  - cli
+  - django template adapter