Add SDD Lifecycle Manager extension to community catalog

Add lifecycle extension submitted by @wagner-sousa to:
- extensions/catalog.community.json (alphabetical order)
- docs/community/extensions.md community extensions table

Closes #3931

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

docs/community/extensions.md

@@ -120,6 +120,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Retrospective Extension | Post-implementation retrospective with spec adherence scoring, drift analysis, and human-gated spec updates | `docs` | Read+Write | [spec-kit-retrospective](https://github.com/emi-dm/spec-kit-retrospective) |
 | Review Extension | Post-implementation comprehensive code review with specialized agents for code quality, comments, tests, error handling, type design, and simplification | `code` | Read-only | [spec-kit-review](https://github.com/ismaelJimenez/spec-kit-review) |
 | Ripple | Detect side effects that tests can't catch after implementation — surface hidden ripple effects across 9 analysis categories | `code` | Read+Write | [spec-kit-ripple](https://github.com/chordpli/spec-kit-ripple) |
+| SDD Lifecycle Manager | Phase-gate lifecycle for Spec Kit — lock spec artifacts after finalization, block destructive commands, allow only refine/bugfix | `process` | Read+Write | [spec-kit-lifecycle](https://github.com/wagner-sousa/spec-kit-lifecycle) |
 | SDD Utilities | Resume interrupted workflows, validate project health, and verify spec-to-task traceability | `process` | Read+Write | [speckit-utils](https://github.com/mvanhorn/speckit-utils) |
 | Security Review | Full-project secure-by-design security audits plus staged, branch/PR, plan, task, follow-up, and apply reviews | `code` | Read+Write | [spec-kit-security-review](https://github.com/DyanGalih/spec-kit-security-review) |
 | SFSpeckit | Enterprise Salesforce SDLC with 18 commands for the full SDD lifecycle. | `process` | Read+Write | [spec-kit-sf](https://github.com/ysumanth06/spec-kit-sf) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-07-29T00:00:00Z",
+  "updated_at": "2026-08-03T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -2104,6 +2104,40 @@
       "created_at": "2026-03-17T00:00:00Z",
       "updated_at": "2026-03-17T00:00:00Z"
     },
+    "lifecycle": {
+      "name": "SDD Lifecycle Manager",
+      "id": "lifecycle",
+      "description": "Phase-gate lifecycle for Spec Kit — lock spec artifacts after finalization, block destructive commands, allow only refine/bugfix",
+      "author": "Wagner Sousa",
+      "version": "1.0.0",
+      "download_url": "https://github.com/wagner-sousa/spec-kit-lifecycle/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/wagner-sousa/spec-kit-lifecycle",
+      "homepage": "https://github.com/wagner-sousa/spec-kit-lifecycle",
+      "documentation": "https://github.com/wagner-sousa/spec-kit-lifecycle#readme",
+      "changelog": "https://github.com/wagner-sousa/spec-kit-lifecycle/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "category": "process",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=0.4.0"
+      },
+      "provides": {
+        "commands": 5,
+        "hooks": 2
+      },
+      "tags": [
+        "lifecycle",
+        "governance",
+        "gates",
+        "workflow",
+        "sdd"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-08-03T00:00:00Z",
+      "updated_at": "2026-08-03T00:00:00Z"
+    },
     "linear": {
       "name": "Linear Integration",
       "id": "linear",