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

scripts/coverage/diff.mjs

@@ -52,6 +52,9 @@ const ALLOWED_GLOBS = [
   /\.prettierignore$/,
   /\.npmrc$/,
   /(^|\/)\.env(\.[^/]+)?$/, // .env, .env.example, .env.local, etc.
+  // Design reference material (ADR-029) — read-only prototypes committed
+  // under docs/product/reference/; never executed, never tested.
+  /^docs\/product\/reference\//,
   // Shell scripts (not Vitest-covered)
   /\.sh$/,
   /\.bash$/,