docs: clarify the README and first workflow

[MrScripty]

Summary

• Lead with the workflow framework's purpose and show the existing multi-branch workbench capture.
• Give readers a short, model-free first run and direct links to the desktop and integration guides.
• Preserve host, model-quality, authoring and license limitations.

Verification

• Revalidated the current main revision and checked commands, relative links and screenshot suitability against repository source.
• Independently reviewed the documentation changes.
• Runtime commands were not executed for this documentation-only edit.

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