fix: Use official HashiCorp Terraform MCP server

- Replace non-existent @modelcontextprotocol/server-terraform package
- Use docker-based HashiCorp terraform-mcp-server
- Keep Context7 MCP server as npx package (working)
- Docker validated and working in GitHub Actions environment
- This fixes MCP server connectivity issues in feature discovery

Resolves: #224

Author: lgallard

.github/workflows/feature-discovery.yml

@@ -118,10 +118,12 @@ jobs:
             {
               "mcpServers": {
                 "terraform": {
-                  "command": "npx",
+                  "command": "docker",
                   "args": [
-                    "-y",
-                    "@modelcontextprotocol/server-terraform@latest"
+                    "run",
+                    "-i",
+                    "--rm",
+                    "hashicorp/terraform-mcp-server"
                   ]
                 },
                 "context7": {