Use Phast app for product names and preserve phast wordplay

phast.json

@@ -2,7 +2,7 @@
   "schema_version": 1,
   "kind": "phast",
   "slug": "my",
-  "name": "My Phast",
+  "name": "My Phast app",
   "host": "my.phast.app",
   "surfaces": {"human": "/", "mcp": "/mcp"},
   "tools": {