[extension] Add LLM Wiki extension to community catalog (#3361)

* Add LLM Wiki extension to community catalog

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

Closes #3319

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

* fix: limit catalog.community.json changes to wiki entry + timestamps only

Reverts the unintended reordering and reformatting of existing extensions
(aide, checkpoint, critique, threatmodel, etc.) and companion's tools array.
Only the new wiki entry and updated_at timestamps are now changed.

Assisted-by: GitHub Copilot (model: claude-sonnet-4.6, autonomous)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

docs/community/extensions.md

@@ -67,6 +67,7 @@ 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) |
+| LLM Wiki | LLM-maintained compounding project wiki: source ingestion, cited answers, and consistency linting | `docs` | Read+Write | [spec-kit-wiki](https://github.com/formin/spec-kit-wiki) |
 | 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) |

extensions/catalog.community.json

@@ -4375,6 +4375,40 @@
       "created_at": "2026-04-13T00:00:00Z",
       "updated_at": "2026-04-13T00:00:00Z"
     },
+    "wiki": {
+      "name": "LLM Wiki",
+      "id": "wiki",
+      "description": "LLM-maintained compounding project wiki: source ingestion, cited answers, and consistency linting",
+      "author": "formin",
+      "version": "1.0.0",
+      "download_url": "https://github.com/formin/spec-kit-wiki/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/formin/spec-kit-wiki",
+      "homepage": "https://github.com/formin/spec-kit-wiki",
+      "documentation": "https://github.com/formin/spec-kit-wiki/blob/main/README.md",
+      "changelog": "https://github.com/formin/spec-kit-wiki/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "category": "docs",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=0.2.0"
+      },
+      "provides": {
+        "commands": 5,
+        "hooks": 2
+      },
+      "tags": [
+        "wiki",
+        "knowledge-base",
+        "docs",
+        "memory",
+        "context-management"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-07-06T00:00:00Z",
+      "updated_at": "2026-07-06T00:00:00Z"
+    },
     "wireframe": {
       "name": "Wireframe Visual Feedback Loop",
       "id": "wireframe",