Roles - selectable system promts and mcp

[wkolbnik]

Feature request:

User can configure different system prompts (and maybe mcp) for different roles in the plugin.

First of all, thank you very much for this excellent plugin! At the moment, it is the best LLM-based plugin for Obsidian.

I believe many users, including myself, have knowledge blocks in their vaults covering very different domains and roles.
The plugin supports MCP, and the setup and introductory instructions for their use may vary.

In my case, for example:

• an assistant for recording my workout data in a certain system
• a group of roles as a document creation assistant on specific topics
• a role as a system development assistant for Obsidian (this one is the most dependent on the system prompt), because it consists of links to notes with instructions, (in this case with speckit comands). The agent should decide independently when to call up a note

Ideally, each role would have its own system prompt and a defined set of MCPs. However, this is optional — at least initially, having a changeable system prompt would be very useful.

Prompt templates don't work for this purpose because they are sent only once. The system prompt, on the other hand, is included in every message and is perceived by the agent somewhat differently than a user-entered prompt.

Если нужно, могу оформить это в Markdown или GitHub issue-ready формат.