ci: show docs-only fast path flag in summary

[zensgit]

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[gemini-code-assist]

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[Copilot]

Pull Request Overview

This PR enhances the CI summary output by displaying the docs-only fast path optimization flag. This provides better visibility into when the CI pipeline is taking the optimized path for documentation-only changes.

• Adds the changes job as a dependency to the CI summary job to access its outputs
• Sets the DOCS_ONLY environment variable from the changes job output
• Includes a new "Optimization" section in the CI summary showing the docs-only fast path status

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