feat: use detached spawn for agent #67

Job	Run time
Check: Dependency Review	11s
Check: Lint	4m 15s
Test: Agent (Ubuntu)	18s
Test: Install (Ubuntu)	14s
Test: Agent (macOS M1)	13s
Test: No Agent (Ubuntu)	15s
Test: Install (macOS M1)	11s
Test: No Agent (macOS M1)	11s
Test: Install (Windows)	21s
Test: Path (Ubuntu)	18s
Test: Path (macOS M1)	10s
Test: No Agent (Windows)	20s
Test: Smoke Test (Ubuntu)	19s
Test: Path (Windows)	31s
Test: Smoke Test (macOS M1)	14s
Test: Smoke Test (Windows)	21s
Test: Unit Tests	1m 58s
Check: CodeQL / Analyze (TypeScript)	1m 7s
Test: Dist / Check: Dist	41s
Check: Action Lint / Workflows	17s
	12m 25s

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