feat: drop impeccable scaffolding, .mcp.json moves to infra

template/{{ part_dir }}/biome.jsonc.jinja

@@ -2,13 +2,7 @@
   "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
   "extends": ["ultracite/biome/core", "ultracite/biome/svelte"],
   "files": {
-    "includes": [
-      "!.claude",
-      "!.svelte-kit",
-      "!build",
-      "!.mcp.json",
-      "!.impeccable"
-    ]
+    "includes": ["!.claude", "!.svelte-kit", "!build", "!.mcp.json"]
   },
   "javascript": { "globals": ["Bun"] },
   "overrides": [