Allow MCP skills as MCP tools and prompts

As a developer now that we've activated an MCP resource index for skills, see #185 , we can add the remaining activation facets for skills as MCP tools and prompts.

Acceptance criteria

• Review the prompts and resources as plugins. Refine implementation

• Lazy load skills and available artifacts once selected

• Generate MCP prompt for skill - basic only. Advanced prompts may cause issues across available MCP clients

• Generate a base skill as MCP tool.

  • The tool should provide progressive steps and require verification per step.
  • The tool should provide related artifacts ONLY at the time of their need as available MCP resources

Assumptions and questions

• Discovery of skills should now include multiple paths

  • basic generated MCP prompts
  • MCP tool search/response results, (e.g. "[this skill appears related]" or "[these are all available skills]")
  • MCP indexed resource of skills

• Need to determine the extent to which we maintain state of the steps. Do we handle this across sessions, at min maybe a "[stopped here, recommend you start over]"? "That should be left up to the model" would be the quickest implementation

Jira Issue: PF-4122

Start by reviewing the existing prompt and resource plugin implementations, then trace skill discovery across generated prompts, tool search results, and indexed resources. Clarify lazy-loading and step-state expectations before implementation. Done means skills are available through basic MCP prompts and tools, with related artifacts exposed as resources when needed.