docs(changelog): release v0.9.940

docs(changelog): correct version heading for 0.9.938 release

Fix the malformed heading in the changelog to properly reflect the version number.

docs(changelog): finalize v0.9.938 release notes

docs(changelog): finalize v0.9.937 release notes

Move the unreleased entries under the 0.9.937 heading for the
2026-04-01 release.

docs(changelog): finalize v0.9.936 changelog

docs(changelog): finalize v0.9.935 release notes

docs(changelog): finalize v0.9.934 release notes

docs(changelog): release v0.9.933

chore(project default): record support package release bumps

Update the root changelog and Gemfile.lock to reflect the new `ace-support-core` 0.29.2 and `ace-support-models` 0.9.2 releases.

chore(task-uon): mark as in-progress