Add an MCP resource for indexed skills and artifacts

As a developer I need to expose an MCP resource generated from MCP skills and their related artifacts.

Acceptance criteria

• MCP resource generated from ai-helpers MCP skills and their related artifacts

• Review adding in an option/flag for passing skills through configuration as "always available skills"

Assumptions and questions

• We can leverage the existing docs.json format without the specific need for the API related work.

• Consider the artifacts for skills as simple lists. We just need a way to associate them with the skill itself

• This provides a first layer of exposure for models who read the resource

• These results should automatically be resolved into search results of the existing tools. We'll need to confirm that searching for the simple search of "skills" brings up the listing of all available skills.

Jira Issue: PF-4121

Start by locating the existing docs.json handling and the search tools that resolve skills and artifacts. Trace how MCP resources are generated and how configuration options are passed. Done means the resource exposes skills with their related artifacts, supports the considered always-available configuration, and resolves skill searches into the existing results.