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

.claude/hooks/stop-lint-gate.sh

@@ -4,6 +4,11 @@
 
 cd "$CLAUDE_PROJECT_DIR" || exit 0
 
+# Ensure node/yarn are on PATH via mise
+eval "$(mise activate bash --shims)" 2> /dev/null
+node_dir="$(mise where node 2> /dev/null)/bin"
+[ -d "$node_dir" ] && export PATH="$node_dir:$PATH"
+
 output=$(yarn lint 2>&1)
 status=$?