feat: transcoding attestation protocol, Nix flake, SLSA L3 artifacts#58
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feat: transcoding attestation protocol, Nix flake, SLSA L3 artifacts#58
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…tifacts Phase 2.4: Implement TranscodingPredicate (wsc.dev/transcoding/v1) for carrying cryptographic provenance across the WASM→native compilation boundary. Builder pattern, in-toto Statement wrapper, 16 tests. Issue #48 / FEAT-3: Add flake.nix with Rust 1.90.0 (rust-overlay), Bazel 8, cargo-fuzz/audit/deny, direnv integration, and rust-toolchain.toml for reproducible builds (SLSA L3 prerequisite). Rivet artifacts: FEAT-6, DD-5, REQ-12, CR-17, CD-17, CD-18, CV-25, CV-26, DF-16 for full traceability of new work. Implements: FEAT-6, FEAT-3 Refs: CR-17, CD-17, CD-18 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
TranscodingPredicate(wsc.dev/transcoding/v1) — in-toto predicate for carrying cryptographic provenance across the WASM→native compilation boundary (synth integration). Builder pattern,create_transcoding_statement()helper, 16 tests.flake.nixwith Rust 1.90.0 via rust-overlay, Bazel 8, cargo-fuzz/audit/deny,rust-toolchain.toml,.envrcfor direnv. SLSA Level 3 prerequisite.New files
src/lib/src/transcoding.rsflake.nixrust-toolchain.toml.envrcTest plan
cargo check— workspace compiles cleancargo test -p wsc -- transcoding— 16/16 tests passnix flake check --no-buildpassesnix developprovides rustc 1.90.0 with wasm32-wasip2Closes #48
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