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docs: sync guides + reference + release with current code #136

Job	Run time
Python tests	2m 8s
File size (300-line cap)	15s
Python lint & format	19s
JS build (Vite)	40s
JS lint & format	21s
JS typecheck	1m 3s
JS tests (Vitest)	26s
Package build (release dry-run)	15s
Python typecheck	20s
E2E smoke (Playwright)	1m 21s
PR checks	4s
	7m 12s