[Tcode-Motion]

🎯 What: Adds missing INSTALLATION.md file at repository root.
📊 Coverage: Fixes release workflow .github/workflows/release.yml staging step which references INSTALLATION.md.
✨ Result: Releases can be staged and published without file missing errors, and full test suite passes.

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PR created automatically by Jules for task 9434864175803429881 started by @Tcode-Motion

[google-labs-jules]

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