Add 'kani verify-artifacts' subcommand#4600
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Adds a fourth Project constructor that reads pre-built *.kani-metadata.json + *.symtab.out artifacts from directories on disk instead of running cargo or rustc. The recorded goto_file path is the build machine's OUT_DIR and is wrong after relocation (CI cache, archive, build-system store), so the constructor resolves each goto_file by basename against the directory the metadata file was found in. This relies on kani-compiler's existing emit layout (artifacts co-located with their metadata).
Adds a standalone subcommand that runs the verification pipeline against pre-built compiler artifacts without rebuilding. This is the inverse of '--only-codegen': build systems that own the compile phase (for caching, sharding, or per-crate incremental builds) can produce artifacts with kani-compiler and verify them separately. Mirrors 'kani verify-std' exactly: a standalone subcommand, gated behind -Z unstable-options, that constructs a Project differently and falls through to verify_project().
Round-trip test: build artifacts with 'cargo kani --only-codegen', then verify them with 'kani verify-artifacts'. Uses two harnesses (one passes, one fails) so the test proves the verdict is honest -- that the pipeline actually reached CBMC and propagated the result -- not merely that the command exited. The fixture crate is excluded from the kani workspace (workspace Cargo.toml exclude list, same as no_codegen and no_codegen_error).
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cargo kaniandkaniboth insist on owning the compile phase. There is no way to verify artifacts from an earlier--only-codegenrun, a build system that driveskani-compilerdirectly, or a CI job that splits compilation and verification across machines: every invocation re-runs cargo or rustc, and a build system with its own per-crate cache ends up re-implementing kani-driver's verify half — the goto-cc/goto-instrument/cbmc pipeline, harness scheduling, verdict rendering — to avoid throwing the cache away. #4079 and #4212 are the same friction from the build side.Adds
kani verify-artifacts <DIR>..., a standalone subcommand that scans the given directories for*.kani-metadata.json, resolves each harness'sgoto_fileby basename against the directory the metadata was found in (the recorded path is the producing machine'sOUT_DIR, wrong after relocation), and runsverify_project()over the result. Mirrorsverify-std: sameProjectconstruction shape, gated behind-Z unstable-options. Thescript-based-pretest round-tripscargo kani --only-codegen→kani verify-artifactsagainst a fixture with one passing and one deliberately-failing harness, so a non-zero exit proves the verdict actually reached cbmc rather than silently no-op'd.Two known limitations, documented in the args help: artifacts must come from the same kani version that verifies them (kani-driver does not version-check the metadata schema; happy to add a stamp as a follow-up if there's appetite), and the artifact directory must be writable since
Project::try_new()writes the linked.outnext to each.symtab.out.