Add llms.txt and llms-full.txt

[kmoscoe]

Here is my curated llms.txt and auto-generated llms-full.txt (done with llms_txt2ctx). I will test them with the list of queries in my proposal.

[gemini-code-assist]

Code Review

This pull request introduces a new llms.txt file to provide structured documentation links for AI agents and LLMs. The review feedback highlights a few improvements: updating the 'Get started' and 'Key concepts and tasks' links to use the raw GitHub user content domain for consistency, fixing a broken link for custom_dc/run_mcp_tools.md which currently returns a 404 error, and considering the removal or merging of the 'Advanced (hybrid) setups' section to simplify the documentation structure.

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[rohitkumarbhagat]

Thanks Kara.