docs(release): update changelog for the 2026-02-24 release

[scotthart]

This change is 

[gemini-code-assist]

Summary of Changes

Hello @scotthart, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request finalizes the versioning for the v3.2.0 release by removing pre-release indicators across the codebase. Concurrently, the changelog has been updated to document the new features introduced in the Cloud Key Management Service for this release, ensuring that the project's version information and release notes are accurate and up-to-date.

Highlights

• Changelog Update: The CHANGELOG.md file has been updated to reflect the v3.2.0 release, including new features for the Cloud Key Management Service.
• Release Candidate Tag Removal: The 'rc' (release candidate) tag has been removed from various versioning files, indicating a transition from a release candidate to a stable release.

Changelog

• CHANGELOG.md
  • Updated the v3.2.0 entry to include the release date.
  • Added new features for Cloud Key Management Service, including DeleteCryptoKey and DeleteCryptoKeyVersion RPCs.
  • Introduced the RetiredResource resource and associated ListRetiredResources and GetRetiredResource RPCs.
• CMakeLists.txt
  • Removed the rc pre-release tag from PROJECT_VERSION_PRE_RELEASE.
• MODULE.bazel
  • Updated the module version from 3.2.0-rc to 3.2.0.
• google/cloud/internal/version_info.h
  • Cleared the GOOGLE_CLOUD_CPP_VERSION_PRE_RELEASE macro from rc to an empty string.

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[gemini-code-assist]

Code Review

This pull request prepares for the v3.2.0 release. The changes include updating the CHANGELOG.md with the release date and new features for Cloud Key Management Service, and removing the rc (release candidate) pre-release identifier from the version in the build files (CMakeLists.txt, MODULE.bazel, and google/cloud/internal/version_info.h). The changes are consistent and correct for a release.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.64%. Comparing base (860c4a8) to head (585502d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15997      +/-   ##
==========================================
+ Coverage   92.63%   92.64%   +0.01%     
==========================================
  Files        2334     2334              
  Lines      214635   214633       -2     
==========================================
+ Hits       198823   198845      +22     
+ Misses      15812    15788      -24     

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