feat: add local dictation with Handy and Niri shortcuts

docs/constellation.md

@@ -27,6 +27,10 @@ use a flake to declare its tools without Nix owning the surrounding workspace.
 
 - Neovim, Niri, Walker and the terminal feel right: direct, keyboard-driven
   interaction with useful connections to the rest of the environment.
+- Use Handy for local plain dictation, mainly English with occasional Dutch.
+  Start with Parakeet V3 and clipboard output. Niri owns recording shortcuts;
+  model downloads and microphone preferences remain application-owned. Cleanup
+  through Codex, a cloud API or a local language model is deferred.
 - Outlook is acceptable as an application, but its interaction and integration
   do not fit as naturally. Accessible mail for tools and agents matters separately
   from choosing a mail reader. Preserve meaning and source context, not just text.