feat: implement configurable resource limits for hosts #146

Job	Run time
Cross Compile (linux/amd64, linux/arm64)	26s
Go Tests	1m 10s
Image Size Regression (BASE-04 ≤ 2GB)	1m 14s
Web Build	15s
Performance Benchmark (synthetic 10k, local baseline)	1m 5s
Lint — no bare sleep in tests/e2e	5s
Build (macOS)	39s
	4m 54s

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