Agent-First Testing: Build Quality Into Every AI Coding Session

Agent-first testing embeds automated verification directly into the AI coding agent's workflow - not added afterward. The agent writes code, opens a real browser, verifies the change works, and saves the verification as a test. All in one loop, without leaving the development session. This is a direct response to a structural problem in agent-first development: AI coding agents ship code faster than traditional QA cycles can absorb. When an agent can implement a feature in minutes, a testing workflow that requires hours of separate work is no longer compatible with the development velocity.