testSearchPackagesListsPackagesForExistingProject fails if MCP not loaded "directly" #136

I loaded MCP through dependency in another project (NicolasAnquetil/MooseMCP)
as a result, testSearchPackagesListsPackagesForExistingProject was failing

Claude identified the error as:

1. MCPPackageScopeQuery>>resolvedProjectsNamed: looks up 'MCP' in projectsByName, which is built from projectRegistrations
2. that method filters MetacelloProjectRegistration registry registrations down to only those where loadedInImage is true.
3. 'MCP' loadedInImage flag is false. That flag only gets flipped to true inside MetacelloScriptEngine's actual load: path ; it's never set when a project's code is just present/loaded another way (e.g. via Iceberg checkout in an image).

After reloading MCP "directly" through metacello (install baseline "default"), the test passes