| Stable core | valid/ | Arithmetic, control flow, structs, arrays, indexing, sizeof/alignof, and unsafe pointer basics. |
| Parser | parser/valid + parser/invalid | Comments, literals, nested blocks, struct syntax, bad indentation, missing block markers, and unterminated strings. |
| Typecheck | typecheck/valid + typecheck/invalid | Function calls/returns, pointer-array roundtrip, struct flow, index type errors, and assignment mismatch. |
| Diagnostics | diagnostics/ | Expected snippets for invalid programs, including parser and typecheck subdirectories. |
| Stdlib import | stdlib/ | Stable-candidate module import smoke. |
| Developer experience | run-dx.* + dx/ | Actionable help diagnostics, fmt idempotence, lint rule IDs, examples, LSP source, and snippet drift checks. |
| Package trust | run-package-trust.* | Public tezz launchers/tool source, SemVer metadata, lock/registry parity, package checksums, generated package docs, and first-party target docs. |
| Python bridge | run-python-bridge.* + python_bridge/ | tezzc pyext generation, CPython wrapper contents, primitive/buffer mapping, ownership docs, and wrapped/skipped manifests. |
| Native smoke | native/ | Windows/Linux x64 executable smoke for IO, paths, strings, math, vectors, arenas, time, process, net, and HTTP helpers. |
| Stdlib edge | native/stdlib_*_edges.tn | Math divide/null/smoothstep/atan2 behavior plus string/vector/arena ownership and guard behavior. |