Plugin content errors

Name	Requirement
plugin_skills_path_wrong_type	skills must be a string path for the root skills/ directory.
plugin_skills_path_empty	skills must be a non-empty path to the root skills/ directory when provided.
plugin_skills_path_unsupported	skills must resolve to the root skills/ directory.
plugin_skills_directory_missing	A declared root skills/ directory must exist.
plugin_skills_path_not_directory	Root skills/ must be a directory when declared.
plugin_apps_path_wrong_type	apps must be a string path for the root .app.json.
plugin_apps_path_empty	apps must be a non-empty path to the root .app.json when provided.
plugin_apps_path_unsupported	apps must resolve to the root .app.json.
plugin_apps_file_missing	A declared root .app.json file must exist.
plugin_apps_path_not_file	Root .app.json must be a regular file when declared.
plugin_mcp_path_wrong_type	mcpServers must be a string path for the root .mcp.json.
plugin_mcp_path_empty	mcpServers must be a nonempty path. Set it to ./.mcp.json or remove the field.
plugin_mcp_path_unsupported	mcpServers must resolve to the root .mcp.json.
plugin_mcp_file_missing	mcpServers declares the root .mcp.json, but that file doesn't exist.
plugin_mcp_path_not_file	Root .mcp.json must be a regular file.
plugin_runtime_surface_missing	A skills-only ZIP must contain at least one valid skill. Local and workspace packages can also reference an eligible MCP server.