Replace `mcp_docker` in claude config with `MCP_DOCKER`

Fix issue error notification when first fetching registry

Runtime supporting registry.yaml config nodes (#64)

* registry entries can have configs
 * registration time configs are merged into the
   metadata parameter-values for an entry in the
   prompts.core/registry
 * parameter values are made available to mcp server containers when
   they are needed
 * parameter values are also merged into the parameter set when
   tool containers are running

Add info alert about what secrets do

Memoize git refs

Improve copy for configuration steps

Merge pull request #59 from docker/cm/gordon-client

Add Gordon MCP Client

Python servers require the initialized notification

Merge pull request #57 from docker/cm/secret-checks

Implement checks for all required secrets on tiles

Remove buggy debounce from seret setter