ci(security): scan every supported language with CodeQL

[CodeinScrubs]

Summary

• add immutable CodeQL v4.37.4 analysis on pull requests, main pushes, weekly schedule, and manual dispatch
• scan JavaScript/TypeScript, C#, and Rust with supported no-build extraction
• scan Kotlin and Swift with manual JDK 21/Gradle and SwiftPM/Xcode compiler extraction so native sources are not skipped
• use the security-extended query suite and least-privilege workflow permissions
• document the automated security boundary without claiming it replaces human review

Local verification

• actionlint v1.7.12
• documentation/link validation
• git diff --check

The CodeQL action SHA is the immutable commit behind official tag v4.37.4. The first hosted run established the five check names; all five are now required by strict main protection, bringing the enforced total from 18 to 23 contexts.

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.