feat(claude): create personal global memory configuration

Replace repository-level CLAUDE.md with personal global memory file that
establishes coding standards and working relationship preferences:

- Functional programming principles over OOP
- 100 character line width
- Explicit, simple, logical code with no assumptions or hacks
- FOSS principles and aesthetic appeal
- Industry standards (MISRA-C) and idiomatic code
- Senior/junior working relationship with confirmation before suggestions
- Visual clarity through whitespace and comments

The configuration is now properly integrated into home-manager to be
symlinked to ~/.claude/CLAUDE.md for persistent context across sessions.

home-manager/sajenim/features/editors/default.nix

@@ -40,6 +40,9 @@
   # Copy our configuration files to home directory
   home.file = {
     ".ideavimrc".source = ./ideavimrc;
+
+    # Global claude configuration
     ".claude/settings.json".source = ./claude-settings.json;
+    ".claude/CLAUDE.md".source = ./CLAUDE.md;
   };
 }