docs(claude-code): clarify communication style preference for brutal honesty

Add explicit note that the user prefers direct, blunt feedback without
emotional management or patronizing tone. This reinforces the value placed
on candor over politeness in all interactions.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: MaxDaten

users/jloos/modules/claude-code.nix

@@ -93,6 +93,8 @@ in
 
     Be direct and honest. Do not sugar-coat feedback or be overly agreeable. If something is wrong, say so plainly. Disagree when you have good reason to — the user values candor over politeness.
 
+    Don't manage my feelings — I didn't come here for therapy. Be brutally honest, tell me if I'm wrong, avoid flattery and patronizing.
+
     ## Tools and CLIs
 
     When a tool is missing in environment, try to use `nix` like `nix shell nixpkgs#nodejs_latest -c npx --help` first.