docs(dwim-shell): record accepted 7z password-on-argv tradeoff

7-Zip 26.01 reads the encryption password only from its controlling TTY, not stdin or a file — a piped password silently becomes an empty one — so it has to go on argv and is briefly visible in the process list. Rather than switch off the .7z format to gpg-wrapped tar, the exposure is accepted: single-user workstation, short-lived process, password already kept out of shell history by the mode-600 temp file. Documented the evaluated tradeoff in both encrypt/decrypt docstrings so it's visible at the call site.

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