refactor: standardize shell initialization and improve PATH management

- Consolidate common environment setup across Fish, Bash, and PowerShell
- Improve PATH handling with deduplication and proper ordering
- Clean up TODO.md formatting and organization
- Simplify CUDA and development tool configuration

home/dot_bashrc.tmpl

@@ -1,6 +1,13 @@
 # ~/.bashrc: executed by bash(1) for non-login shells.
 # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
 # for examples
+#
+# Load order:
+#   1. ~/.bashrc (this file) - Bash-specific configuration
+#   2. commonrc.sh.tmpl - Shared environment setup (PATH, tools, etc.)
+#   3. ~/.bash_aliases - Aliases and functions
+#
+# Fish equivalent: ~/.config/fish/config.fish → commonrc.fish.tmpl
 
 # If not running interactively, don't do anything
 case $- in
@@ -98,23 +105,16 @@ if ! shopt -oq posix; then
   fi
 fi
 
+# thefuck - corrects previous console command
 if command -v thefuck &> /dev/null; then
     eval $(thefuck --alias)
 fi
 
+# VS Code / Cursor shell integration
 [[ "$TERM_PROGRAM" == "vscode" ]] && . "$(code --locate-shell-integration-path bash)"
 
-{{/* Common shared aliases, scripts, & shell setup details. */ -}}
+# Load shared environment setup (PATH, tools, version managers, etc.)
 {{ template "scripts/commonrc.sh.tmpl" dict "data" . "shell" "bash" }}
 
-{{/* Chezmoi's shell completion */ -}}
-{{ completion "bash" }}
-
-# If WSL, add SSH key on startup (once per WSL start)
-{{- if .wsl }}
-eval `keychain --quiet --eval --agents ssh ~/.ssh/id_rsa`
-{{ end }}
-
-# SDKMAN initialization
-export SDKMAN_DIR="$HOME/.sdkman"
-[[ -s "$HOME/.sdkman/bin/sdkman-init.sh" ]] && source "$HOME/.sdkman/bin/sdkman-init.sh"
+# Chezmoi shell completion
+{{ completion "bash" }}