Adds eslint@^8.57.1, prettier@^3.0.0, typescript@^5.6.2 as direct
devDependencies so pnpm --frozen-lockfile exposes their binaries
in node_modules/.bin for CI lint/type-check/format-check steps.
Fixes PRI-564.
Co-Authored-By: Paperclip <noreply@paperclip.ing>