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fix: S3 streaming + Range, task heartbeat + after-commit enqueue, token rehash, scaffold fixes, QA follow-ups (#449–#472) #487

Job	Run time
JS build (Vite)	39s
E2E smoke (Playwright)	2m 11s
Python typecheck	17s
Python tests	16m 14s
JS lint & format	18s
Perf guards (Playwright)	1m 40s
File size (300-line cap)	16s
JS typecheck	49s
Python lint & format	17s
Package build (release dry-run)	15s
Migrations round trip (Postgres)	43s
JS tests (Vitest)	40s
PR checks	3s
	24m 22s