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Sibling `test-system-commands-keymap.el` locked the keymap shape. This batch covers the runtime helpers and commands:
- `cj/system-cmd--resolve`: trims strings, errors on empty/non-string-non-symbol, round-trips a symbol whose value is a non-empty string, errors on a symbol with empty value.
- `cj/system-cmd`: wraps a plain string in `nohup ... &` and hands it to `start-process-shell-command`; a confirm-tagged var with an N response signals user-error.
- `cj/system-cmd-exit-emacs`: declining the prompt aborts; accepting calls `kill-emacs`.
- `cj/system-cmd-restart-emacs`: declining aborts before scheduling; accepting schedules two timers.
- `cj/system-command-menu`: the completing-read pick routes through `call-interactively` to the right command symbol.
Top-level defvars for `test-sc-my-cmd` and `test-sc-empty-cmd` make the let-bindings dynamic so `symbol-value` reaches them under lexical scope.
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