feat(content): add new content

[spiritax]

🛰️ Tech Radar Update: 2026-05-12

This merge request adds 16 new entries to the Tech Radar. The focus of this update is primarily on the expansion of our Kotlin Multiplatform (KMP) ecosystem, modernizing our testing stack, and streamlining build-logic via Gradle convention plugins.

📋 New Entries Added

Category	Files Added
Multiplatform	compose-multiplatform, room-kmp, filekit
Testing	mockk, google-truth, gradle-android-test-aggregation-plugin
Infrastructure	gradle-convention-plugins, modularization-spm
iOS / Swift	swift6.md, arkana-ios, batch-ios
Android	arkana-android, batch-android
Utilities	libphonenumber, human-readable, kizitonwose-calendar

🚀 Key Highlights

• Kotlin Multiplatform (KMP) Growth: Added room-kmp and compose-multiplatform as we move toward more shared UI and data layers.
• Standardization: Introduction of gradle-convention-plugins to reduce boilerplate across our modularized project structure.
• Swift 6 Readiness: Added an entry for swift6 to begin assessing the impact of strict concurrency and other breaking changes.
• Improved Testing: Integrated mockk and google-truth to standardize our assertion and mocking styles.

🔍 Reviewer Notes

Please check the .md files to ensure:

1. The Ring (Adopt, Trial, Assess, Hold) is appropriate for our current usage.
2. The Rationale provided for each technology matches our team's experience.

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