Add ContextForge MCP extension to community catalog

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

Closes #3456

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

Author: github-actions[bot]

docs/community/extensions.md

@@ -49,6 +49,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Coding Standards Drift Control | Generate coding-standards drift reports and remediation tasks for active Spec Kit features | `code` | Read+Write | [spec-kit-coding-standards-drift-control](https://github.com/benizzio/spec-kit-coding-standards-drift-control) |
 | Conduct Extension | Orchestrates spec-kit phases via sub-agent delegation to reduce context pollution. | `process` | Read+Write | [spec-kit-conduct-ext](https://github.com/twbrandon7/spec-kit-conduct-ext) |
 | Confluence Extension | Create a doc in Confluence summarizing the specifications and planning files | `integration` | Read+Write | [spec-kit-confluence](https://github.com/aaronrsun/spec-kit-confluence) |
+| ContextForge MCP | Integrates codebase-memory-mcp + headroom into Spec Kit — graph-based code intelligence and context compression for the implement phase | `code` | Read+Write | [contextforge-mcp](https://github.com/capatinore/contextforge-mcp) |
 | Cost Tracker | Track real LLM dollar cost across SDD workflows — per-feature budgets, per-integration comparison, and finance-ready exports | `visibility` | Read+Write | [spec-kit-cost](https://github.com/Quratulain-bilal/spec-kit-cost) |
 | Data Model Diagram | Generates Mermaid ER diagrams from Spec Kit data models after planning | `docs` | Read+Write | [spec-kit-data-model-diagram](https://github.com/benizzio/spec-kit-data-model-diagram) |
 | DocGuard — CDD Enforcement | The only doc-integrity engine with an MCP server, SARIF output, and a deterministic zero-LLM core. Validates, scores, and traces documentation against code — 24 validators, stable finding codes, GitHub Action with PR annotations, spec-kit hooks. Pure Node.js, one pinned dep. | `docs` | Read+Write | [spec-kit-docguard](https://github.com/raccioly/docguard) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-07-08T00:00:00Z",
+  "updated_at": "2026-07-13T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -969,6 +969,41 @@
       "created_at": "2026-03-29T00:00:00Z",
       "updated_at": "2026-03-29T00:00:00Z"
     },
+    "contextforge-mcp": {
+      "name": "ContextForge MCP",
+      "id": "contextforge-mcp",
+      "description": "Integrates codebase-memory-mcp + headroom into Spec Kit — graph-based code intelligence and context compression for the implement phase.",
+      "author": "capatinore",
+      "version": "0.1.0",
+      "download_url": "https://github.com/capatinore/contextforge-mcp/releases/download/ext-v0.1.0/contextforge-mcp-speckit-extension.zip",
+      "repository": "https://github.com/capatinore/contextforge-mcp",
+      "homepage": "https://github.com/capatinore/contextforge-mcp",
+      "documentation": "https://github.com/capatinore/contextforge-mcp/blob/main/README.md",
+      "changelog": "",
+      "license": "MIT",
+      "category": "code",
+      "effect": "read-write",
+      "requires": {
+        "speckit_version": ">=0.10.0"
+      },
+      "provides": {
+        "commands": 4,
+        "hooks": 0
+      },
+      "tags": [
+        "mcp",
+        "code-intelligence",
+        "context-compression",
+        "tokens",
+        "claude",
+        "spec-driven-development"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-07-13T00:00:00Z",
+      "updated_at": "2026-07-13T00:00:00Z"
+    },
     "cost": {
       "name": "Cost Tracker",
       "id": "cost",