97d03eb7bdb7d88f6c6090659fd9a2345bae8429
DefaultMaterializingArtifactWriter and its MaterializingArtifactWriter interface
were test-only orphans after the sandbox dual-write retirement (95e79bf) - no
production wiring, never instantiated outside their own test. Delete all three.
Add healthcheck_*.txt to .gitignore (one-off generated output).
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