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fix(users): harden the session_version cache #370

Job	Run time
Python lint & format	12s
Python tests	7m 41s
JS build (Vite)	51s
JS tests (Vitest)	51s
JS typecheck	39s
Package build (release dry-run)	11s
JS lint & format	19s
File size (300-line cap)	13s
E2E smoke (Playwright)	2m 11s
Perf guards (Playwright)	1m 38s
Python typecheck	14s
PR checks	4s
	15m 4s