v0.5.22 release

v0.5.22 release notes for the GitHub Release v0.5.22 (release task: Issue #1091).

Tag state (verified against origin)

Ref	Object	Points at
`v0.5.22`	annotated tag `2d697f3140474054a9aeaff0da76623d5f6dd3e0`	commit `6f0be5f96c21ff19b452fe1ac047b2cb23d966c1`

Review sessions are killed at 15 minutes while a tool is still inside its own timeout deadline: the wait pauses the signals but not the exhaustion counter (Issue #1089; PR #1090)