Update ai-coding-productivity.md

Author: benelog

content/ai-coding-productivity.md

@@ -1,4 +1,7 @@
 ## 사례/연구
+- [This CTO Says 93% of Developers Use AI, but Productivity Is Still 10%](https://shiftmag.dev/this-cto-says-93-of-developers-use-ai-but-productivity-is-still-10-8013/)
+    - Looking at about 4.2 million developers between November 2025 and February 2026, AI-authored code now makes up 26.9% of all production code – up from 22% last quarter.
+- [Over Half of Google's Production Code Is Now AI-Generated 2026-01-12](https://roocode.com/blog/over-half-of-googles-production-code-is-now-aigenerated)
 - (2026년 2월) Atlassian의 생산성 개선 수치 ( [Building world-class engineering teams in the age of AI - The Pragmatic Summit](https://www.youtube.com/watch?v=fYh1CWadxDM))
     - 엔지니어당 PR 수 89% 증가
     - 이슈 사이클 타임 42% 감소