chore(release): release Buzz Desktop version 0.5.16 (#6191)

## Buzz Desktop release v0.5.16

- **Frozen main:** `ee992ff0822f44d1c308822f116cb9d26f9a3386`
- **Reviewed candidate:** `a6211b0e285600a6f08d6592261e44ecc4a6917b`
- **Previous desktop release:** `desktop-v0.5.15`
- **Proposed immutable tag:** `desktop-v0.5.16`

This PR may be **squash merged** after the Desktop Release Candidate
check and all protected-branch checks pass. Merging authorizes
publication of the exact reviewed candidate; later or unrelated changes
on `main` cannot alter it.

The checked-in changelog accounts for every non-merge commit in the
release range. The Desktop tag points to the reviewed candidate commit,
not the later squash commit. Publication remains bound to that immutable
candidate tag.

Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Release Automation <release-automation@users.noreply.github.com>

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## v0.5.16
+
+### Desktop and shared changes
+
+- fix(desktop): restore release agent mentions ([#6182](https://github.com/block/buzz/pull/6182)) ([`ee992ff0822f44d1c308822f116cb9d26f9a3386`](https://github.com/block/buzz/commit/ee992ff0822f44d1c308822f116cb9d26f9a3386))
+- test(desktop): cover exact workflow batch limit ([#6168](https://github.com/block/buzz/pull/6168)) ([`f8692fa9b52ddcfeb4b95fb4862109983509f131`](https://github.com/block/buzz/commit/f8692fa9b52ddcfeb4b95fb4862109983509f131))
+
+### Other repository changes
+
+- None
+
+[Compare desktop-v0.5.15...desktop-v0.5.16](https://github.com/block/buzz/compare/desktop-v0.5.15...desktop-v0.5.16)
+
 ## v0.5.15
 
 ### Desktop and shared changes