chore(claude-code): only allow report_task tool for task reporting

We only need the single `report tasks` tool for tasks reporting. Also, you don't need to inject all Coder tools when no task reporting is required.

Coder MCP tools are usually useful when used from an external system rather than within Coder Tasks.

Author: matifali

registry/coder/modules/claude-code/scripts/install.sh

@@ -90,11 +90,7 @@ function report_tasks() {
     echo "Configuring Claude Code to report tasks via Coder MCP..."
     export CODER_MCP_APP_STATUS_SLUG="$ARG_MCP_APP_STATUS_SLUG"
     export CODER_MCP_AI_AGENTAPI_URL="http://localhost:3284"
-    coder exp mcp configure claude-code "$ARG_WORKDIR"
-  else
-    export CODER_MCP_APP_STATUS_SLUG=""
-    export CODER_MCP_AI_AGENTAPI_URL=""
-    echo "Configuring Claude Code with Coder MCP..."
+    export CODER_MCP_ALLOWED_TOOLS="report_tasks"
     coder exp mcp configure claude-code "$ARG_WORKDIR"
   fi
 }