chore(ai): ensure boost is only used for mcp

- we will be using our own custom AI rules, not the boost-defined ones so we should not install the boost rules/ skills

boost.json

@@ -0,0 +1,11 @@
+{
+    "agents": [
+        "codex",
+        "opencode",
+        "cursor",
+        "claude_code"
+    ],
+    "mcp": true,
+    "nightwatch_mcp": false,
+    "sail": false
+}