feat: pipeline artifact persistence#10
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Introduce ArtifactStore struct that persists every intermediate artifact produced during a migration run to a timestamped directory. Includes 16 save methods covering all pipeline stages (C source, analysis, c2rust, translation chunks/modules/signatures, validation, repair iterations, best-version tracking, final output, tests, manifest) plus 19 unit tests.
Save every intermediate artifact throughout migrate_file(): C source, C2Rust output, analysis JSON, translation, retranslations (stub/unsafe/ stall), initial validation, each repair iteration with its validation, rejected repairs, best-version updates, final output, generated tests, and a manifest summary. All saves are fire-and-forget (never fail the pipeline). Add Serialize derive to ValidationResult for JSON persistence.
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Summary
ArtifactStorethat persists every intermediate pipeline output to.noricum-artifacts/{name}-{timestamp}/migrate_file()orchestrator with fire-and-forget pattern (artifact save failures never break the pipeline)translate_chunkedvia newChunkedTranslationResulttype--artifacts-dirCLI flag (default:.noricum-artifacts/)Motivation
During expensive migrations ($5-10 in tokens), intermediate outputs were held only in memory and lost — each repair iteration overwrote the previous, per-chunk translations were combined and dropped, analysis results lived in local variables. This made debugging failed migrations impossible.
Test plan
ArtifactStoremethod (content round-trips)cargo clippy --workspace -- -D warningspasses (0 warnings)cargo test --workspacepasses (419 tests, 0 failures)