[extension] Add Blueprint Index — Living Architecture Map extension to community catalog (#3718)

* Add Blueprint Index extension to community catalog

Add blueprint-index extension submitted by @ogil109 to:
- extensions/catalog.community.json (alphabetical order)
- docs/community/extensions.md community extensions table

Closes #3628

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* Potential fix for pull request finding

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docs/community/extensions.md

@@ -36,6 +36,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Archive Extension | Archive merged features into main project memory. | `docs` | Read+Write | [spec-kit-archive](https://github.com/stn1slv/spec-kit-archive) |
 | 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) |
 | Branch Convention | Configurable branch and folder naming conventions for /specify with presets and custom patterns | `process` | Read+Write | [spec-kit-branch-convention](https://github.com/Quratulain-bilal/spec-kit-branch-convention) |
 | Brownfield Bootstrap | Bootstrap spec-kit for existing codebases — auto-discover architecture and adopt SDD incrementally | `process` | Read+Write | [spec-kit-brownfield](https://github.com/Quratulain-bilal/spec-kit-brownfield) |
 | BrownKit | Evidence-driven capability discovery, security and QA risk assessment for existing codebases | `process` | Read+Write | [BrownKit](https://github.com/MaksimShevtsov/BrownKit) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-07-21T00:00:00Z",
+  "updated_at": "2026-07-24T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -489,6 +489,46 @@
       "created_at": "2026-04-17T00:00:00Z",
       "updated_at": "2026-04-17T00:00:00Z"
     },
+    "blueprint-index": {
+      "name": "Blueprint Index — Living Architecture Map",
+      "id": "blueprint-index",
+      "description": "Living architecture map for brownfield and greenfield projects, with a deterministic CI gate that blocks contradictions between the map, specs, and code while warning on non-blocking drift.",
+      "author": "ogil109",
+      "version": "0.2.0",
+      "download_url": "https://github.com/ogil109/spec-kit-blueprint/releases/download/v0.2.0/blueprint.zip",
+      "repository": "https://github.com/ogil109/spec-kit-blueprint",
+      "homepage": "https://github.com/ogil109/spec-kit-blueprint/tree/main",
+      "documentation": "https://github.com/ogil109/spec-kit-blueprint/blob/main/README.md",
+      "changelog": "https://github.com/ogil109/spec-kit-blueprint/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "category": "process",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=0.10.0",
+        "tools": [
+          { "name": "bash", "required": false },
+          { "name": "git", "required": false }
+        ]
+      },
+      "provides": {
+        "commands": 4,
+        "hooks": 0
+      },
+      "tags": [
+        "blueprint",
+        "architecture",
+        "coherence",
+        "drift",
+        "brownfield",
+        "autonomous",
+        "ci"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-07-24T00:00:00Z",
+      "updated_at": "2026-07-24T00:00:00Z"
+    },
     "branch-convention": {
       "name": "Branch Convention",
       "id": "branch-convention",