Update Agent Governance extension to v1.2.0 (#2659)

Update agent-governance extension submitted by @bigsmartben:
- extensions/catalog.community.json (version, download_url, description, tools)
- docs/community/extensions.md community extensions table

Closes #2624

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-05-20T00:00:00Z",
+  "updated_at": "2026-05-21T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -71,10 +71,10 @@
     "agent-governance": {
       "name": "Agent Governance",
       "id": "agent-governance",
-      "description": "Project-local agent governance memory and context projection.",
+      "description": "Generate agent-platform repository governance files from Spec Kit metadata.",
       "author": "bigben",
-      "version": "1.1.0",
-      "download_url": "https://github.com/bigsmartben/spec-kit-agent-governance/archive/refs/tags/v1.1.0.zip",
+      "version": "1.2.0",
+      "download_url": "https://github.com/bigsmartben/spec-kit-agent-governance/archive/refs/tags/v1.2.0.zip",
       "repository": "https://github.com/bigsmartben/spec-kit-agent-governance",
       "homepage": "https://github.com/bigsmartben/spec-kit-agent-governance",
       "documentation": "https://github.com/bigsmartben/spec-kit-agent-governance/blob/main/README.md",
@@ -84,8 +84,8 @@
         "speckit_version": ">=0.8.0",
         "tools": [
           {
-            "name": "python3",
-            "required": false
+            "name": "uv",
+            "required": true
           }
         ]
       },
@@ -103,7 +103,7 @@
       "downloads": 0,
       "stars": 0,
       "created_at": "2026-05-14T00:00:00Z",
-      "updated_at": "2026-05-15T00:00:00Z"
+      "updated_at": "2026-05-21T00:00:00Z"
     },
     "agent-orchestrator": {
       "name": "Intelligent Agent Orchestrator",