Optimize same-process job queue with direct notifications and drain-on-stop #1838

Job	Run time
build	36s
test-bun-unit	1m 37s
test-bun-ai-provider-hft	1m 8s
test-bun-integration	49s
test-bun-ai-provider-llamacpp	1m 56s
test-bun-ai-provider-api	28s
test-bun-rag	1m 33s
test-vitest-ai-provider-hft	1m 32s
test-vitest-rag	1m 51s
test-vitest-ai-provider-api	37s
test-vitest-ai-provider-llamacpp	2m 8s
test-vitest-unit	1m 13s
test-vitest-integration	1m 6s
cleanup	3s
merge-vitest-coverage	28s
	17m 5s

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