v3.0.0-rc.4

What's Changed

• test: add packed npm and pnpm consumer gates by @olliethedev in #251
• fix(codegen): delegate through consumer-aware CLI by @olliethedev in #250
• feat(cli): restore Better Auth UI scaffold by @olliethedev in #252
• docs: publish stable v3 migration playbook by @olliethedev in #253
• chore: prepare v3.0.0-rc.4 release by @olliethedev in #254

Full Changelog: v3.0.0-rc.3...v3.0.0-rc.4