GenBank files contain CDS features with /translation qualifiers holding protein sequences, but there was no converter to extract these into FAA (FASTA amino acid) format.

Changes

• bioconvert/genbank2faa.py: New GENBANK2FAA converter with a biopython method that iterates CDS features, extracts /translation qualifiers, and writes FAA output with >protein_id product headers. CDS features without a translation qualifier are skipped.
• test/data/genbank/test_genbank2faa.gbk: Minimal GenBank fixture with two CDS entries.
• test/data/faa/test_genbank2faa.faa: Expected FAA output for the fixture.
• test/test_genbank2faa.py: Parametrized test with MD5 comparison against expected output.

Usage

from bioconvert.genbank2faa import GENBANK2FAA

converter = GENBANK2FAA("genome.gbk", "proteins.faa")
converter()  # uses biopython method by default

Output format:

>AAA00001.1 thr operon leader peptide
MKRISTTITTTITITTGNGAG
>AAA00002.1 homoserine kinase
MVKVYAPASSANMSVGFDVLG

• Fixes gbk to faa #343

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