[extension] Add spec-kit-atlas extension to community catalog (#4105)

* Add spec-kit-atlas extension to community catalog

Add atlas extension submitted by @ashbrener to:
- extensions/catalog.community.json (alphabetical order)
- docs/community/extensions.md community extensions table

Closes #3993

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* Potential fix for pull request finding

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docs/community/extensions.md

@@ -35,6 +35,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Architecture Guard | Framework-agnostic architecture review extension for validating implementation against governance and architecture constitutions, detecting architectural drift, and generating non-blocking refactor tasks | `process` | Read+Write | [spec-kit-architecture-guard](https://github.com/DyanGalih/spec-kit-architecture-guard) |
 | Architecture Workflow | Generate or reverse project-level 4+1 architecture views with per-view and full-workflow commands | `docs` | Read+Write | [spec-kit-arch](https://github.com/bigsmartben/spec-kit-arch) |
 | Archive Extension | Archive merged features into main project memory, resolving gaps and conflicts. | `docs` | Read+Write | [spec-kit-archive](https://github.com/stn1slv/spec-kit-archive) |
+| spec-kit-atlas | Synthesize spec-kit specs into faithful, interactive architecture storybooks & doc portals. | `docs` | Read-only | [spec-kit-atlas](https://github.com/ashbrener/spec-kit-atlas) |
 | Azure DevOps Integration | Sync user stories and tasks to Azure DevOps work items using OAuth authentication | `integration` | Read+Write | [spec-kit-azure-devops](https://github.com/pragya247/spec-kit-azure-devops) |
 | Blueprint | Stay code-literate in AI-driven development: review a complete code blueprint for every task from spec artifacts before /speckit.implement runs | `docs` | Read+Write | [spec-kit-blueprint](https://github.com/chordpli/spec-kit-blueprint) |
 | Blueprint Index — Living Architecture Map | A living architecture map for spec-driven projects, kept honest by a deterministic, low-friction, machine-first CI gate (JSON, self-healable) that blocks only when the map contradicts the specs or code. Brownfield or greenfield. | `process` | Read+Write | [spec-kit-blueprint](https://github.com/ogil109/spec-kit-blueprint) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-08-11T00:00:00Z",
+  "updated_at": "2026-08-13T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "adrkit": {
@@ -390,6 +390,44 @@
       "created_at": "2026-03-14T00:00:00Z",
       "updated_at": "2026-08-11T00:00:00Z"
     },
+    "atlas": {
+      "name": "spec-kit-atlas",
+      "id": "atlas",
+      "description": "Synthesize spec-kit specs into faithful, interactive architecture storybooks & doc portals.",
+      "author": "Ash Brener",
+      "version": "0.1.0",
+      "download_url": "https://github.com/ashbrener/spec-kit-atlas/archive/refs/tags/v0.1.0.zip",
+      "repository": "https://github.com/ashbrener/spec-kit-atlas",
+      "homepage": "https://github.com/ashbrener/spec-kit-atlas",
+      "documentation": "https://github.com/ashbrener/spec-kit-atlas/blob/main/README.md",
+      "changelog": "https://github.com/ashbrener/spec-kit-atlas/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "category": "docs",
+      "effect": "read-only",
+      "requires": {
+        "speckit_version": ">=0.1.0",
+        "tools": [
+          { "name": "python", "version": ">=3.11", "required": true },
+          { "name": "uv", "required": true }
+        ]
+      },
+      "provides": {
+        "commands": 2,
+        "hooks": 0
+      },
+      "tags": [
+        "documentation",
+        "architecture",
+        "storybook",
+        "traceability",
+        "atlas"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-08-13T00:00:00Z",
+      "updated_at": "2026-08-13T00:00:00Z"
+    },
     "azure-devops": {
       "name": "Azure DevOps Integration",
       "id": "azure-devops",