Add Spec Kit Design System extension to community catalog (#4707)

Add design extension submitted by @artursopelnik to:\n- extensions/catalog.community.json (alphabetical order)\n- docs/community/extensions.md community extensions table\n\nCloses #4694\n\nAssisted-by: GitHub Copilot (model: gpt-5.2-codex, autonomous)\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

docs/community/extensions.md

@@ -149,6 +149,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Spec Critique Extension | Dual-lens critical review of spec and plan from product strategy and engineering risk perspectives | `docs` | Read-only | [spec-kit-critique](https://github.com/arunt14/spec-kit-critique) |
 | Spec Diagram | Auto-generate Mermaid diagrams of SDD workflow state, feature progress, and task dependencies | `visibility` | Read-only | [spec-kit-diagram-](https://github.com/Quratulain-bilal/spec-kit-diagram-) |
 | Spec Inventory | Read-only inventory of live requirement and task IDs, with focused per-task context packs instead of whole-file dumps | `visibility` | Read-only | [spec-kit-inventory-alignment](https://github.com/Yash-Chindam/spec-kit-inventory-alignment) |
+| Spec Kit Design System | Give it an RFC. It runs the Spec Kit workflow and implements the change using your design system. | `integration` | Read+Write | [spec-kit-design-system](https://github.com/artursopelnik/spec-kit-design-system) |
 | Spec Kit Discovery Extension | Run technical discovery commands for feasibility, technology selection, scenario-specific technical decisions, legacy codebase assessment, implementation understanding, and proof-of-concept validation | `process` | Read+Write | [spec-kit-discovery](https://github.com/bigsmartben/spec-kit-discovery) |
 | Spec Kit Figma | Grounds SpecKit spec/plan/tasks in Figma design context via REST or MCP, on macOS/Linux/Windows. | `integration` | Read+Write | [spec-kit-figma](https://github.com/Fyloss/spec-kit-figma) |
 | Spec Kit Memory | Recalls prior specs and decisions from configurable memory tools (e.g. memsearch) before SDLC stages, so planning and specification start from what the project already knows | `docs` | Read+Write | [spec-kit-memory](https://github.com/zaytsevand/spec-kit-memory) |

extensions/catalog.community.json

@@ -1808,6 +1808,52 @@
       "created_at": "2026-08-17T00:00:00Z",
       "updated_at": "2026-08-17T00:00:00Z"
     },
+    "design": {
+      "name": "Spec Kit Design System",
+      "id": "design",
+      "description": "Give it an RFC. It runs the Spec Kit workflow and implements the change using your design system.",
+      "author": "artursopelnik",
+      "version": "0.1.0",
+      "download_url": "https://github.com/artursopelnik/spec-kit-design-system/archive/refs/tags/v0.1.0.zip",
+      "sha256": "787047d6a52399a7092f8bccca9268fc67f17de66723675fc83a9cd72604de4e",
+      "repository": "https://github.com/artursopelnik/spec-kit-design-system",
+      "homepage": "https://github.com/artursopelnik/spec-kit-design-system",
+      "documentation": "https://github.com/artursopelnik/spec-kit-design-system/blob/main/README.md",
+      "changelog": "https://github.com/artursopelnik/spec-kit-design-system/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "category": "integration",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=1.0.0,<2.0.0",
+        "tools": [
+          {
+            "name": "python3",
+            "version": ">=3.9",
+            "required": true
+          },
+          {
+            "name": "bash",
+            "required": true
+          }
+        ]
+      },
+      "provides": {
+        "commands": 4,
+        "hooks": 3
+      },
+      "tags": [
+        "design-system",
+        "design-tokens",
+        "accessibility",
+        "autonomous",
+        "reuse"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-09-23T00:00:00Z",
+      "updated_at": "2026-09-23T00:00:00Z"
+    },
     "ears": {
       "name": "EARS Requirements Syntax",
       "id": "ears",