Add test coverage analysis identifying key gaps in the test suite
Analyzes ~1,771 test files across the monorepo and maps them against
~993 core source files. Key findings: build pipeline at 3.2% unit
coverage, server rendering engine at 5.5%, client runtime at 5.2%,
and 8 published packages with zero tests.
https://claude.ai/code/session_01W5oziAfkFMoBzSKyLFXuAu