THE INSTRUMENT — ask a free-form CROSS-SPECIES genetics question and get FILTERED, HONEST HINTS (never a
confident guess). It compiles your question into a typed query plan over the dog<->human edge-graph, runs it
deterministically, and scores each answer PATH by its weakest edge — returning ranked hints with an evidence
TIER (fact / computational / inferred) + citations, or an honest ABSTAIN with a demand signal when the graph
can't answer. BEST FOR model-discovery / translational traversal: 'which dog breeds or genes model human
<disease>', 'what is the dog ortholog of <gene>', 'what dog disease is phenotypically like <human disease>'.
Answers are HYPOTHESIS-GENERATING, not clinical claims: a `fact` hint = an OMIA-curated model-of; a
`computational` hint = a conserved 1:1 dog ortholog (a candidate — never 'dogs get this disease'); `inferred`
= shared cross-species phenotype. Returns {plan (what it asked the graph), hints:[{answer, tier, score,
path (the cited edges), weakest_edge, provenance}], abstain, demand_signal}. Set narrate=true for a gated
one-line prose summary per hint (faithful-or-honest-template; it can never fabricate). Use `ask` instead for
owner-facing breed/disease/carrier questions; use THIS for human-disease -> dog-model cross-species queries.
