Add focused deterministic tests, run targeted test filters first, and expand to full suites after local behavior is proven.
go test ./path/to/pkg -run '^TestName$'go test ./path/to/pkg -run 'TestName/sub_case'pnpm --dir web vitest run src/path/file.test.tspnpm --dir web vitest run -t "case name"pnpm --dir web playwright test -g "test title"internal/sim >= 85%, internal/lessons >= 85%.cmd/simcli coverage with CLI behavior tests for main execution paths.web/ exists): selectors/adapters/components covered by Vitest.