what have i done

src/lib/csound-reference/array-operations-discrete-cosine-transform.ts

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+import type { CsoundReference } from './types'
+
+// Array Operations: Discrete Cosine Transform
+export const arrayOperationsDiscreteCosineTransform: CsoundReference[] = [
+{
+  name: 'dct',
+  type: 'opcode',
+  category: 'Array Operations: Discrete Cosine Transform',
+  description: 'Discrete Cosine Transform of a sample array (type-II DCT).',
+  syntax: 'kout[] = dct(kin[])\n    iout[] = dct(iin[])',
+  example: '--8<-- "examples/dct.csd"',
+  rates: ['k-rate'],
+  seeAlso: ['Vectorial opcodes', 'array opcodes', 'dctinv']
+},
+{
+  name: 'dctinv',
+  type: 'opcode',
+  category: 'Array Operations: Discrete Cosine Transform',
+  description: 'Inverse Discrete Cosine Transform of a sample array (type-III DCT).',
+  syntax: 'kout[] = dctinv(kin[])\n    iout[] = dctinv(iin[])',
+  example: '--8<-- "examples/dctinv.csd"',
+  rates: ['k-rate'],
+  seeAlso: ['Vectorial opcodes', 'array opcodes', 'dct']
+},
+]