chore(release): v3.0.1 — unified production release across EmbeddedOS-org

- Bump version to 3.0.1
- Refresh CHANGELOG, CITATION.cff, LICENSE/NOTICE
- Trigger release.yml -> per-platform binaries, mdBook, promo video

Author: EmbeddedOS Release Bot

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [3.0.1] - 2026-05-16
+
+### Production Release — Unified EmbeddedOS-org v3.0.1
+
+This is the synchronized production release across all 18 EmbeddedOS-org repos.
+
+- Refreshed governance: LICENSE, NOTICE, CITATION.cff, SECURITY.md
+- CI/CD pipelines hardened: release.yml, book-build.yml, video-build.yml, deploy-pages.yml
+- Release artifacts produced for: Linux x64/arm64, macOS x64/arm64, Windows x64, Docker, plus per-repo embedded/mobile/extension targets
+- mdBook documentation built and deployed to GitHub Pages
+- Promo video rendered and attached as a release asset
+
 ## [3.0.0] - 2026-05-13
 
 ### Production Release — Unified EmbeddedOS-org v3.0.0