add mise config

Configs/fish/.config/fish/completions/mise.fish

@@ -0,0 +1,17 @@
+# if "usage" is not installed show an error
+if ! command -v usage &> /dev/null
+    echo >&2
+    echo "Error: usage CLI not found. This is required for completions to work in mise." >&2
+    echo "See https://usage.jdx.dev for more information." >&2
+    return 1
+end
+
+if ! set -q _usage_spec_mise_2025_7_29
+  set -g _usage_spec_mise_2025_7_29 (mise usage | string collect)
+end
+set -l tokens
+if commandline -x >/dev/null 2>&1
+    complete -xc mise -a '(usage complete-word --shell fish -s "$_usage_spec_mise_2025_7_29" -- (commandline -xpc) (commandline -t))'
+else
+    complete -xc mise -a '(usage complete-word --shell fish -s "$_usage_spec_mise_2025_7_29" -- (commandline -opc) (commandline -t))'
+end

Configs/fish/.config/fish/config.fish

@@ -4,4 +4,7 @@ if status is-interactive
     # Commands to run in interactive sessions can go here
     zoxide init --cmd cd fish | source
     atuin init fish | source
+
+    mise activate fish | source
 end
+