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feat(tenancy): fail-closed isolation + tenants module (SaaS groundwork) #410

Job	Run time
JS tests (Vitest)	49s
JS typecheck	50s
E2E smoke (Playwright)	1m 58s
Perf guards (Playwright)	1m 26s
Python lint & format	15s
JS lint & format	17s
Package build (release dry-run)	14s
File size (300-line cap)	11s
JS build (Vite)	34s
Python typecheck	12s
Python tests	9m 49s
PR checks	3s
	16m 38s