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fix(build): keep test files out of the page globs and the bundle #388

Job	Run time
Python tests	6m 40s
Perf guards (Playwright)	1m 34s
Python lint & format	15s
JS tests (Vitest)	48s
JS build (Vite)	47s
E2E smoke (Playwright)	2m 14s
JS typecheck	41s
Python typecheck	17s
JS lint & format	17s
Package build (release dry-run)	13s
File size (300-line cap)	12s
PR checks	2s
	14m 0s