Update Atlas extension display name in community catalog (#4202)

Update atlas extension submitted by @ashbrener to:
- extensions/catalog.community.json (name: spec-kit-atlas → Atlas)
- docs/community/extensions.md community extensions table

Closes #4196

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docs/community/extensions.md

@@ -38,7 +38,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | 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) |
 | ASCII Diagram Renderer | Renders hand-drawn ASCII/Unicode diagrams (state machine, architecture, flow, coverage map) of what spec/plan/tasks/analyze already say — plain text, no Mermaid renderer needed | `docs` | Read+Write | [spec-kit-ascii-diagram](https://github.com/MRZHUH/spec-kit-ascii-diagram) |
-| 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) |
+| 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": "2026-08-18T00:00:00Z",
+  "updated_at": "2026-08-19T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "adrkit": {
@@ -463,7 +463,7 @@
       "updated_at": "2026-08-17T00:00:00Z"
     },
     "atlas": {
-      "name": "spec-kit-atlas",
+      "name": "Atlas",
       "id": "atlas",
       "description": "Synthesize spec-kit specs into faithful, interactive architecture storybooks & doc portals.",
       "author": "Ash Brener",
@@ -498,7 +498,7 @@
       "downloads": 0,
       "stars": 0,
       "created_at": "2026-08-13T00:00:00Z",
-      "updated_at": "2026-08-13T00:00:00Z"
+      "updated_at": "2026-08-19T00:00:00Z"
     },
     "azure-devops": {
       "name": "Azure DevOps Integration",