Mergeback v3.29.11 refs/heads/releases/v3 into main

[github-actions]

This PR bumps the version number and updates the changelog after the v3.29.11 release.

Please do the following:

• Remove and re-add the "Update dependencies" label to the PR to trigger just this workflow.
• Wait for the "Update dependencies" workflow to push a commit updating the dependencies.
• Mark the PR as ready for review to trigger the full set of PR checks.
• Approve and merge the PR. When merging the PR, make sure "Create a merge commit" is
  selected rather than "Squash and merge" or "Rebase and merge".

[Copilot]

Pull Request Overview

This is a mergeback PR that updates version information after the v3.29.11 release, bumping the version to v3.29.12 and updating the changelog to document the previous release.

• Version bump from v3.29.11 to v3.29.12 in package.json
• Changelog updated to document the v3.29.11 release with entry dated 21 Aug 2025
• Added placeholder "No user facing changes" entry for unreleased version

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Updates version number from 3.29.11 to 3.29.12
CHANGELOG.md	Adds changelog entry for v3.29.11 release and placeholder for unreleased changes

[github-actions]

Pushed a commit to update the checked-in dependencies. Please mark the PR as ready for review to trigger PR checks.