chore(release): bump version to 7.15.4

[miclle]

Summary

• bump package version to 7.15.4
• move the sandbox conditional request injection changelog entry under 7.15.4

Validation

• npm run check-type
• npm run test:sandbox
• npm pack --dry-run

[gemini-code-assist]

Code Review

This pull request updates the package version from 7.15.3 to 7.15.4 in package.json and updates CHANGELOG.md to document the changes for version 7.15.4, specifically moving the sandbox request injection support features to the new version section. There are no review comments, so I have no feedback to provide.

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[fennoai]

No issues found in this review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.44%. Comparing base (32685e9) to head (f819b05).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
+ Coverage   93.41%   93.44%   +0.02%     
==========================================
  Files          14       14              
  Lines        2006     2014       +8     
==========================================
+ Hits         1874     1882       +8     
  Misses        132      132              

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