script: options for shuffling the order in which sketches are searched in a database

[ctb]

for straight up sourmash zipfiles, it turns out to be surprisingly hard to change the order in which sketches are loaded.

some options for @bettafische -

• update the actual order of things in the SOURMASH-MANIFEST.csv inside the actual sig zip file; requires copying the entire sig zip file 😭.
• use a file list - a list of paths to .sig, .sig.gz, or .sig.zip files containing individual sketches - and shuffle that. May be slow/memory intensive.

it would also be fairly straightforward to add an option to sourmash to randomize the order of manifests, but it would be a bit of a hack... could be good for testing/evaluation but shouldn't be in the released version of sourmash.

[ctb]

note to self: write some example code using src/sourmash/manifest.py to do the shuffling 😅

[ctb]

code & instructions in https://github.com/ctb/2025-sourmash-shuffle-manifest