Add Team Assign extension to community catalog (#2642)

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

Closes #2597

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-05-15T00:00:00Z",
+  "updated_at": "2026-05-20T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -2965,6 +2965,37 @@
       "created_at": "2026-03-02T00:00:00Z",
       "updated_at": "2026-03-02T00:00:00Z"
     },
+    "team-assign": {
+      "name": "Team Assign",
+      "id": "team-assign",
+      "description": "Assign tasks.md items to human engineers, split into subtasks, and generate a per-engineer workboard",
+      "author": "tarunkumarbhati",
+      "version": "1.0.0",
+      "download_url": "https://github.com/tarunkumarbhati/spec-kit-team-assign/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/tarunkumarbhati/spec-kit-team-assign",
+      "homepage": "https://github.com/tarunkumarbhati/spec-kit-team-assign",
+      "documentation": "https://github.com/tarunkumarbhati/spec-kit-team-assign/blob/main/README.md",
+      "changelog": "https://github.com/tarunkumarbhati/spec-kit-team-assign/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.1.0"
+      },
+      "provides": {
+        "commands": 3
+      },
+      "tags": [
+        "team",
+        "assignment",
+        "process",
+        "planning",
+        "subtasks"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-05-20T00:00:00Z",
+      "updated_at": "2026-05-20T00:00:00Z"
+    },
     "time-machine": {
       "name": "Time Machine",
       "id": "time-machine",