Update Jira Integration (Sync Engine) extension to v0.5.0

Update jira-sync extension submitted by @ashbrener:
- extensions/catalog.community.json (version, download_url, updated_at)
- docs/community/extensions.md community extensions table

Closes #4099

Assisted-by: GitHub Copilot (model: claude-sonnet-4.6, autonomous)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-08-14T00:00:00Z",
+  "updated_at": "2026-08-17T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "adrkit": {
@@ -2181,8 +2181,8 @@
       "id": "jira-sync",
       "description": "An idempotent, drift-aware, fail-closed reconcile engine that mirrors spec-kit specs into Jira (Epic per repo, Story per spec, Subtask per phase).",
       "author": "Ash Brener",
-      "version": "0.4.0",
-      "download_url": "https://github.com/ashbrener/spec-kit-jira-sync/archive/refs/tags/v0.4.0.zip",
+      "version": "0.5.0",
+      "download_url": "https://github.com/ashbrener/spec-kit-jira-sync/archive/refs/tags/v0.5.0.zip",
       "repository": "https://github.com/ashbrener/spec-kit-jira-sync",
       "homepage": "https://github.com/ashbrener/spec-kit-jira-sync",
       "documentation": "https://github.com/ashbrener/spec-kit-jira-sync/blob/main/README.md",
@@ -2216,7 +2216,7 @@
       "downloads": 0,
       "stars": 0,
       "created_at": "2026-06-08T00:00:00Z",
-      "updated_at": "2026-06-24T00:00:00Z"
+      "updated_at": "2026-08-17T00:00:00Z"
     },
     "keel": {
       "name": "Keel Discovery",