chore(main): release 3.15.0

[flagsmithdev]

🤖 I have created a release beep boop

3.15.0 (2026-09-15)

Features

• schemas: add feature state metadata envelope (#272) (26eeade)

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.64%. Comparing base (26eeade) to head (3cd728c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #273   +/-   ##
=======================================
  Coverage   97.64%   97.64%           
=======================================
  Files         110      110           
  Lines        4919     4919           
=======================================
  Hits         4803     4803           
  Misses        116      116           

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[flagsmithdev]

🤖 Created releases:

• v3.15.0

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