Function describeAtom

describeAtom(
atom: AtomInsight,
ctx: DescribeContext,
): { fallback: boolean; phrase: InsightPhrase }
One atom as a phrase: its requirement when solvable, a shape-pattern match when recognizable (host patterns first), otherwise the GROQ fallback with a reads hint.
Parameters
- atom: AtomInsight
- ctx: DescribeContext
Returns { fallback: boolean; phrase: InsightPhrase }