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fix(tests): collect tests/, and correct the two assertions that never ran #369

Job	Run time
Python lint & format	13s
JS tests (Vitest)	1m 9s
E2E smoke (Playwright)	2m 5s
Python tests	6m 16s
JS lint & format	22s
JS typecheck	45s
Package build (release dry-run)	15s
Python typecheck	16s
File size (300-line cap)	13s
JS build (Vite)	44s
Perf guards (Playwright)	2m 3s
PR checks	2s
	14m 23s