chore(release): bump version to 7.15.5

[miclle]

Summary

• bump package version to 7.15.5
• document sandbox template filtering, runtime injection updates, and GitHub token updates
• exclude local .env files from npm packages

Validation

• npm run check-type
• npm run test:sandbox (122 passing)
• npm pack --dry-run --json (confirmed .env is excluded)

[gemini-code-assist]

Code Review

This pull request updates the package version to 7.15.5, documents the corresponding changes in the changelog, and adds .env to the .npmignore file. There are no review comments, so I have no feedback to provide.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.41%. Comparing base (32685e9) to head (ad0165d).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #455      +/-   ##
==========================================
- Coverage   93.41%   93.41%   -0.01%     
==========================================
  Files          14       14              
  Lines        2006     2050      +44     
==========================================
+ Hits         1874     1915      +41     
- Misses        132      135       +3     

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[fennoai]

No issues found in the changed release metadata. Verified the 7.15.5 package/changelog alignment, clean diff, successful CI checks, and that npm pack excludes .env while retaining .env.example.

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