Fix DE tool "forgetting" a just-fetched sequence — it needed protein, got DNA

Highlight mutated codons in red on generated variant DNA

DE tool now returns real DNA; fix sequence-block stacking; add copy/download

Turing can now fetch a sequence by gene name or accession — new fetch_sequence tool

Wire cross-user field priors into Turing's chat tools (were REST-only)

Turing: wire ESM-2, fix auth header, friendly credits message, tool cards

Turing: go live + wire tool-calling