[codex] polish api and tutorial docs

[k82cn]

Summary

• remove obsolete docs/blogs content and point README documentation links at current docs
• move the standalone RFE368 test plan into its design folder
• polish API, tutorial, SDK, and flmadm docs against the current implementation
• update install Make targets to pass the required flmadm install --all profile flag and show object-cache startup

Validation

• git diff --cached --check
• make -n install-dev
• stale deleted-doc/reference scans
• relative markdown link check for edited docs

[gemini-code-assist]

Code Review

This pull request significantly updates the project's documentation and build infrastructure to align with recent architectural changes. Key updates include the integration of the object cache into the installation and configuration guides, the adoption of uv for Python dependency management, and a comprehensive rewrite of the Python SDK and Runner API documentation. Additionally, the PR removes several outdated blog posts, refines the gRPC API by removing the batch_index field from scheduling messages, and introduces an installer field for application specifications. I have no feedback to provide as there are no review comments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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