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docs: sync guides + reference + release with current code #128

Job	Run time
JS tests (Vitest)	24s
E2E smoke (Playwright)	1m 58s
Python lint & format	16s
Python typecheck	18s
Package build (release dry-run)	16s
File size (300-line cap)	14s
JS lint & format	25s
JS build (Vite)	40s
JS typecheck	1m 11s
Python tests	2m 8s
PR checks	3s
	7m 53s