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1553bea9ff
Move the once-per-session guard to the final extra-code section. Plain and search variables can then refresh without rerunning arbitrary code. Keep the extra body top-level so shell parse behavior stays unchanged. Use an exported generation token for Zsh. Changes to generic or Zsh-specific values reapply both layers, while unchanged nested shells keep Zsh precedence and do not repeat self-references. Plain values are re-evaluated each time the file is applied. Command substitutions run again, and some self-references can change repeatedly. Removing a variable still requires a new session. Closes #3999 Closes #4559