fix test isolation and clean stale artifacts #730

Job	Run time
Production acceptance report	2m 29s
Format check	22s
Clippy	25s
Contract-only dead-code check	53s
Deployment script checks	9s
Supply-chain integrity	2s
Security audit	33s
WASM build	57s
Unit tests	55s
Deploy script failure-mode tests	8s
Reproducible build (run 2)	48s
Reproducible build (run 1)	49s
Error discriminant stability	0s
Verify WASM reproducibility	0s
	8m 30s

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