feat: add SDKMAN integration and improve mise/tool configuration

- Add SDKMAN initialization to bashrc for Java SDK management
- Create Fish shell wrapper function for SDKMAN commands
- Switch from lazy-loading to automatic mise activation in Fish
- Clean up fish_plugins comments for clarity
- Add pnpm to mise tool-versions
- Enable Shift+Enter in Kitty for Claude Code multi-line prompts
- Make update_pre.ts hook executable

home/dot_bashrc.tmpl

@@ -113,4 +113,8 @@ fi
 # If WSL, add SSH key on startup (once per WSL start)
 {{- if .wsl }}
 eval `keychain --quiet --eval --agents ssh ~/.ssh/id_rsa`
-{{ end }}
+{{ end }}
+
+# SDKMAN initialization
+export SDKMAN_DIR="$HOME/.sdkman"
+[[ -s "$HOME/.sdkman/bin/sdkman-init.sh" ]] && source "$HOME/.sdkman/bin/sdkman-init.sh"