docs(designs): Add skills sdk design#528

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mkmeral wants to merge 9 commits intostrands-agents:mainfrom

mkmeral:feature/skills-sdk-design

Commits on Feb 4, 2026

Add skills support design document
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Rewrite skills design doc with proper voice and tone
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Commits on Feb 5, 2026

Replace hook-based tool enforcement with pre-filtering approach
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Trim tool filtering explanation to match document style
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Address API Bar Raising requirements and SDK tenets
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Commits on Feb 13, 2026