Add Loop Engineering extension to community catalog (#3002)

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

Closes #2977

Co-authored-by: Manfred Riem <mnriem@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mnriem

docs/community/extensions.md

@@ -63,6 +63,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Jira Integration (Sync Engine) | Idempotent, drift-aware, fail-closed reconcile engine mirroring spec-kit specs into Jira (Epic per repo, Story per spec, Subtask per phase) | `integration` | Read+Write | [spec-kit-jira-sync](https://github.com/ashbrener/spec-kit-jira-sync) |
 | Learning Extension | Generate educational guides from implementations and enhance clarifications with mentoring context | `docs` | Read+Write | [spec-kit-learn](https://github.com/imviancagrace/spec-kit-learn) |
 | Linear Integration | Mirror spec-kit feature directories into Linear (filesystem → Linear, reconcile-based, unidirectional). | `integration` | Read+Write | [spec-kit-linear-sync](https://github.com/ashbrener/spec-kit-linear-sync) |
+| Loop Engineering | Engineer safe autonomous agent loops for spec-driven development: a maker/checker split, externalized loop state, and stay-the-engineer guardrails against comprehension debt and cognitive surrender | `process` | Read+Write | [spec-kit-loop](https://github.com/formin/spec-kit-loop) |
 | MAQA — Multi-Agent & Quality Assurance | Coordinator → feature → QA agent workflow with parallel worktree-based implementation. Language-agnostic. Auto-detects installed board plugins. Optional CI gate. | `process` | Read+Write | [spec-kit-maqa-ext](https://github.com/GenieRobot/spec-kit-maqa-ext) |
 | MAQA Azure DevOps Integration | Azure DevOps Boards integration for MAQA — syncs User Stories and Task children as features progress | `integration` | Read+Write | [spec-kit-maqa-azure-devops](https://github.com/GenieRobot/spec-kit-maqa-azure-devops) |
 | MAQA CI/CD Gate | Auto-detects GitHub Actions, CircleCI, GitLab CI, and Bitbucket Pipelines. Blocks QA handoff until pipeline is green. | `process` | Read+Write | [spec-kit-maqa-ci](https://github.com/GenieRobot/spec-kit-maqa-ci) |

extensions/catalog.community.json

@@ -1538,6 +1538,40 @@
       "created_at": "2026-06-01T00:00:00Z",
       "updated_at": "2026-06-16T00:00:00Z"
     },
+    "loop": {
+      "name": "Loop Engineering",
+      "id": "loop",
+      "description": "Engineer safe autonomous agent loops for spec-driven development: a maker/checker split, externalized loop state, and stay-the-engineer guardrails against comprehension debt and cognitive surrender",
+      "author": "formin",
+      "version": "1.0.0",
+      "download_url": "https://github.com/formin/spec-kit-loop/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/formin/spec-kit-loop",
+      "homepage": "https://github.com/formin/spec-kit-loop",
+      "documentation": "https://github.com/formin/spec-kit-loop/blob/main/README.md",
+      "changelog": "https://github.com/formin/spec-kit-loop/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "category": "process",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=0.2.0"
+      },
+      "provides": {
+        "commands": 5,
+        "hooks": 2
+      },
+      "tags": [
+        "loop-engineering",
+        "automation",
+        "verification",
+        "maker-checker",
+        "workflow"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-06-16T00:00:00Z",
+      "updated_at": "2026-06-16T00:00:00Z"
+    },
     "m365": {
       "name": "Microsoft 365 Integration",
       "id": "m365",