docs(product): commit design references under docs/product/reference/

Copy the founder's design handoff bundle (.proto/design/) into
docs/product/reference/ byte-for-byte so dispatch agents running in git
worktrees can read the HTML prototypes, veect-codebase/ prototype,
upload PNGs, and remaining bundle files (ADR-029: reference only, never
vendored into packages/). Ignore-list entries so whole-codebase auditors
and formatters skip reference material: .prettierignore (byte
preservation through lint-staged), .fallowrc.json ignorePatterns, root
ESLint ignores, and the coverage:diff allowlist in
scripts/coverage/diff.mjs (+ unit test). .DS_Store files skipped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

docs/product/reference/project/veect-codebase/src/lib/utils.ts

@@ -0,0 +1,18 @@
+import { clsx, type ClassValue } from 'clsx';
+import { twMerge } from 'tailwind-merge';
+
+/** shadcn-style class combiner: clsx + tailwind-merge. */
+export function cn(...inputs: ClassValue[]): string {
+  return twMerge(clsx(inputs));
+}
+
+/** Clamp a number into [min, max]. */
+export function clamp(value: number, min: number, max: number): number {
+  return Math.max(min, Math.min(max, value));
+}
+
+/** Truncate a string on a word boundary with an ellipsis. */
+export function truncate(text: string, max: number): string {
+  if (text.length <= max) return text;
+  return `${text.slice(0, max - 1).replace(/\s+\S*$/, '')}…`;
+}