docs(vz-backend): add V030_INTEGRATION_NOTES.md grounded in evidence #47

Job	Run time
Rust (fmt + clippy + tests, threads=1 & 4)	1m 8s
Shell helpers (cross-platform.sh + runtime-cleanup.sh)	9s
Smokes (dry-run lane)	8s
Vz full boot (self-hosted)	0s
	1m 25s

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