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fix: S3 streaming + Range, task heartbeat + after-commit enqueue, token rehash, scaffold fixes, QA follow-ups (#449–#472) #484

Job	Run time
JS tests (Vitest)	1m 3s
JS typecheck	50s
Python lint & format	17s
File size (300-line cap)	15s
E2E smoke (Playwright)	2m 14s
Python typecheck	15s
JS lint & format	22s
JS build (Vite)	52s
Python tests	16m 44s
Perf guards (Playwright)	1m 49s
Package build (release dry-run)	13s
Migrations round trip (Postgres)	36s
PR checks	3s
	25m 33s