feat: source-derived Q&A with statewide CA ocean species coverage (#1)

Block bare Dungeness topic fallbacks

Tighten Dungeness fallback guard

Tighten Dungeness generic fallback tests

Allow concrete Dungeness harvest answers

Tighten Dungeness fallback matcher

test: catch more dungeness unknown status fallbacks

test: catch unavailable dungeness harvest status

test: catch dungeness harvest status without authority

test: catch dungeness harvest status fallback

test: catch dungeness harvest intent fallback

test: catch dungeness harvest status fallback

test: flag dungeness open closed alternatives

test: narrow dungeness concrete result guard

test: allow concrete dungeness direct answers

test: broaden dungeness fallback guard

test: use semantic dungeness fallback guard

test: bound forbidden claim matching

test: tighten forbidden claim negation scope

test: scope dungeness fallback to direct answer

test: allow negated forbidden answer claims

test: reduce real query fixture brittleness

test: scope required answer terms to answer copy

test: separate real query assertion buckets

test: accept species display casing

test: add real CoastWise query fixture