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fix: guard gen-i18n against dropping namespaces; correct alembic branch-label docs #466

Job	Run time
Python lint & format	15s
JS typecheck	33s
E2E smoke (Playwright)	2m 3s
Perf guards (Playwright)	1m 31s
JS lint & format	18s
File size (300-line cap)	15s
Python tests	12m 58s
Package build (release dry-run)	15s
JS build (Vite)	50s
Python typecheck	14s
JS tests (Vitest)	53s
PR checks	4s
	20m 9s