[docs] Upcoming 4.147.0 release notes

[github-actions]

Polished release notes for the upcoming 4.147.0 release, the first of the 4.x series.

What's covered

• Engine — Skia milestone 147 (14-milestone jump, Chrome 133 → 147); community work by @ramezgerges
• Text & Fonts — Full OpenType variable font APIs (SKTypeface, HarfBuzzSharp.Face/Font) and COLRv1 color font palette support
• API Surface — SKSamplingOptions overloads for SKSurface.Draw / SKCanvas.DrawSurface
• Bug Fixes — Android API 36 SIGSEGV crash fix; Windows crash on systems without DirectX 12
• Security — libpng 1.6.58 and libexpat 2.7.5
• Platform — Tizen x64 and ARM64; C# 13 on legacy TFMs via PolySharp
• Breaking Changes — SKPath immutability, SKPathBuilder migration, SKColorType shifts, 7 removed native C API symbols

Files changed

File	Change
documentation/docfx/releases/4.147.0.md	New release notes page (created)
documentation/docfx/releases/TOC.yml	TOC entry added for 4.147.0
documentation/docfx/releases/index.md	Index updated

This PR is automatically updated each time changes merge to main. The branch dev/upcoming-release-notes is reused so only one PR stays open.

Note

🔒 Integrity filter blocked 14 items

The following items were blocked because they don't meet the GitHub integrity level.

• #3785 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
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To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
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