Fix SSH key creation as a uid without passwd entry (ssh-keygen, ssh-keyscan, ssh-add wrappers)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -3,6 +3,13 @@
 All notable changes to CodeCraft. Versions follow [Semantic Versioning](https://semver.org/);
 until 1.0, minor versions may contain breaking changes.
 
+## [Unreleased]
+
+### Fixed
+
+- Creating an SSH key failed with "No user exists for uid 99": `ssh-keygen`, `ssh-keyscan` and
+  `ssh-add` get the same passwd workaround as `ssh`.
+
 ## [v202611-00034] – 2026-11-15
 
 ### Fixed