[OPIK-6466] Retire Agent Config and use Prompt Library

[petrotiurin]

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Below is a concise technical summary of the changes proposed in this PR:
Elevate the Prompt Library in the docs to detail how to manage versioned prompts via client.create_prompt / client.get_prompt (and chat variants) while keeping metadata for model and temperature together with each template. Clarify the instrumentation narrative so @opik.track-decorated functions own prompt fetching and deprecated config workflows are retired in favor of the Prompt Library.

Topic	Details
Prompt Library	Describe the Prompt Library migration so prompts and their metadata drive runtime model/temperature values instead of opik.Config artifacts and link the new guidance back to the Opik skill overview and reference content. Modified files (4) README.md skills/opik/SKILL.md skills/opik/instrument-agent-config.md skills/opik/references/tracing-python.md Latest Contributors(2) User Commit Date petrotiurin fixup readme May 15, 2026 alexander.kuzmik99@gma... Update skills for Opik... April 16, 2026
Instrumentation	Update instrumentation guidance to force prompt calls inside @opik.track-decorated functions, note the Prompt Library dependency, and tweak the tracing/skill steps accordingly. Modified files (2) skills/instrument/SKILL.md skills/opik/instrument-tracing.md Latest Contributors(2) User Commit Date petrotiurin swap steps for clearer... May 15, 2026 alexander.kuzmik99@gma... Update skills for Opik... April 16, 2026

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