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Add support for the SHELL_PROMPT_PREFIX, SHELL_PROMPT_SUFFIX, and SHELL_WELCOME environment variables as standardized by systemd v257. SHELL_PROMPT_PREFIX and SHELL_PROMPT_SUFFIX are automatically prepended and appended to the left prompt at the shell level, so all prompts (default, custom, and sample) pick them up without modification. SHELL_WELCOME is displayed after the greeting when an interactive shell starts. These variables provide a standard interface for tools like systemd's run0 to communicate session context to the shell. Fixes https://github.com/fish-shell/fish-shell/issues/10924 Closes #12570