provide an improved human-readable output & exploration utility for taxonomy

[ctb]

based in part on experiences in #3534, I think we could improve our human-readable output for inspecting taxonomy results. this is particularly important as we head towards more comprehensive examination of tax membership

a few specific things come to mind -

• options to limit display to either total % explained (e.g. "I want to see what explains 99% of tax assignments, and no more" - to avoid the tons of .01% matches), or total number of hits (I only want to see n hits), or only hits above
• hierarchical output organized by higher level ranks, e.g. "order hits by phylum level % explained, but then show me details for the top x% of species underneath that"

this could definitely be a plugin!

see also https://github.com/ctb/2025-explore-sourmash-gather for a similarly-motivated script for exploring gather results w/o taxonomy.

[ctb]

with reference to #3537 - perhaps we could have this work entirely on the output of tax annotate, for speed reasons.

[ctb]

see https://github.com/ctb/2025-atb-small-genomes/blob/main/round3/parse.py - gives output like so,

% parse.py SAMN07157241.entire.gather.with-lineages.csv -m 1
SAMN07157241 SAMN07157241
        50.0% Eukaryota;Chordata;Mammalia;Primates;Hominidae;Homo;Homo sapie...
        37.5% d__Bacteria;p__Pseudomonadota;c__Gammaproteobacteria (2 species)
        8.3% d__Bacteria;p__Bacillota;c__Bacilli;o__Lactobacillales;f__Stre...
        4.2% unknown

for multiple files, etc. Right now it's specialized for AllTheBacteria/AllTheBacteria#59 but it'd be easy to make it nicer. It's reasonably fast, takes about 5 minutes for 2,000 files containing 3.3m fastmultigather results. Uses polars, of course ;).