feat(fish): source config.local.fish for machine-specific config

Author: fx

dot_config/fish/config.fish.tmpl

@@ -14,3 +14,6 @@ end
 
 # Aliases
 alias claude='claude --dangerously-skip-permissions'
+
+# Source local machine-specific config (not managed by dotfiles)
+test -f ~/.config/fish/config.local.fish && source ~/.config/fish/config.local.fish