Start the "Coverage Until Threshold" loop.

Goal: coverage meets the target threshold (default 80%) with all tests passing
Max iterations: 12
Between iterations run: npm test -- --coverage
Exit when: coverage threshold is met and tests exit 0

Step 1: Run coverage. Add focused tests for the biggest uncovered gaps, then repeat.

Self-pace this loop. After each iteration, run the check command, read the output, and only continue if the exit condition is not met. Stop when the exit condition passes or max iterations is reached. Give a short status update each pass.