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fix(build): keep test files out of the page globs and the bundle #387

Job	Run time
Python lint & format	1m 55s
JS tests (Vitest)	48s
Perf guards (Playwright)	1m 49s
Python typecheck	16s
Python tests	7m 42s
File size (300-line cap)	14s
JS build (Vite)	45s
JS lint & format	29s
JS typecheck	40s
E2E smoke (Playwright)	2m 19s
Package build (release dry-run)	13s
PR checks	4s
	17m 14s