fix: resolve shell startup errors and streamline tool management

- Guard brew shellenv in fish config with test -x for Linux compat
- Pin Python to 3.13 with compile=true (freethreaded builds broken)
- Pin neovim, go, terraform, aws-cli, cmake, dotnet-ef to stable versions
- Remove hugo and gdu from mise (unused / broken upstream)
- Comment out pipx-backed tools (mise can't find uvx when self-managed)
- Move mise [settings] above [tools] with pipx.uvx=true
- Fix dnf group name for dnf5 (development-tools lowercase)
- Remove vendored fzf binary (now managed by mise)
- Simplify Dotbot: force-relink mise config, targeted ~/.local clean,
  remove fzf custom linking (now via standard ~/.config/ glob)
- Fix lint gate hook to find yarn via mise shims

scripts/install-dnf-packages.sh

@@ -42,11 +42,11 @@ packages=(
 # Install the Development Tools dnf group
 install_dev_tools_group()
 {
-  if dnf group list installed 2> /dev/null | grep -q "Development Tools"; then
+  if dnf group list installed 2> /dev/null | grep -q "development-tools"; then
     msgr ok "@development-tools group already installed"
   else
     msgr run "Installing @development-tools group"
-    sudo dnf group install -y "Development Tools"
+    sudo dnf group install -y "development-tools"
   fi
   return 0
 }