Fix bun detection, dev flushing, and init command #2489

Job	Run time
units / 🧪 Unit Tests	1m 5s
typecheck / typecheck	1m 5s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 6s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 3s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	58s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	58s
	6m 15s

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