shell-glossary 20251026

- Filtered log of core changes:
f6c7058 replstr_sed_posix(): [fmt] remove var cmd substitution quotes
47ff5bc path_spec_static(): [fmt] remove var cmd substitution quotes
638583d sq_arg_extract(): Swap superfluous `while` for `for`
11be38b sq_arg(): Swap superfluous `while` for `for`
20914b6 replchar(): Swap superfluous `while` for `for`
bfd264b opt_err(): Swap superfluous `while` for `for`

- Complete log between 20251024 and 20251026 (f6c7058):
f6c7058 replstr_sed_posix(): [fmt] remove var cmd substitution quotes
47ff5bc path_spec_static(): [fmt] remove var cmd substitution quotes
638583d sq_arg_extract(): Swap superfluous `while` for `for`
11be38b sq_arg(): Swap superfluous `while` for `for`
20914b6 replchar(): Swap superfluous `while` for `for`
bfd264b opt_err(): Swap superfluous `while` for `for`
b2e9fd1 README.md: Update showcase for 20251024