# Compatibility policy ## Beta contract Compiler `v1.0.0-beta.2` and runtime `sando/v1.0.0-beta.1` are semantic-version prereleases. They are supported for learning, classroom projects, evaluation, and compatibility testing. Before final v1, source syntax, generated output, the runtime API, CLI behavior, diagnostics, and configuration may change without compatibility shims. Every public change must still be documented and generation must remain deterministic. The beta is not a production-stability commitment. Maintainers accept and triage security reports within the boundary described in [SECURITY.md](../SECURITY.md), but cannot promise that a beta fix preserves its public API. ## Final-v1 contract At final v1, semantic versions apply independently to the compiler and `sando` runtime. Generated files record the exact compiler version and required runtime ABI. Patch releases do not intentionally change accepted source semantics or generated public signatures. Minor releases may add fail-closed syntax or API capabilities while continuing to render previously valid components. Major releases may remove or reinterpret behavior. Generated files are source artifacts, not a stable interchange format across compiler versions; `himesan check` defines whether they are current. The project makes no compatibility promise for internal packages, development SSE payloads before final v1, or hand-edited generated files. ## Go and platform support The current beta targets Go 1.25 and Go 1.26 on Linux/amd64. Required release evidence runs in Linux CI and on Linux deployment hosts. WSL is treated as a Linux development environment. Native Windows, macOS, and other targets are not maintained release targets or release blockers; a successful build there is useful portability evidence, not a compatibility promise. A Go or platform support change is announced in release notes before it takes effect. ### Historical Beta 1 observations The following table is retained because the tests genuinely ran. It records a point-in-time Beta 1 campaign and does not define the current support matrix. The current public evidence is the exact Beta 1 source at commit `b7a84054d755e42285e50298e41e47f06a8325a5` (tree `be9e118e38dfebed19f60403ededdadabe07d2aa`): | Platform | Go lanes | Maintainer-run result | | --- | --- | --- | | Windows 11/amd64 on NTFS | 1.25.12, 1.26.5 | Native tests, race, vet, builds, generation, process cleanup, watcher boundaries, and temporary consumer compilation passed; privileged symlink and POSIX-only permission cases were not exercised | | Linux/amd64 on WSL2 with an ext4 checkout | 1.25.12, 1.26.5 | Tests, race, vet, builds, generation, focused filesystem/development cases, and license checks passed | | Linux/amd64 in isolated containers on a Linux server | 1.25.12, 1.26.5 | The earlier pre-beta baseline passed tests, race, vet, builds, deterministic generation, and license checks; this was not rerun on the exact Beta 1 commit | | macOS | — | Not executed during the Beta 1 campaign | The golden generated file had SHA-256 `63fa75a3049a3a8a12d769d7f9b6b510dfe763baacf706775b75cef2c57a984f` on every tested Windows and Linux lane in that historical campaign. The signed Beta tags and fresh direct/public-proxy installation were verified after publication. For Beta 1, add the nested runtime to an application module before installing the parent compiler at the same version; this avoids a Go module-cache path-selection ambiguity observed in the reverse order. ## Portability feedback Developers may try the beta on an unsupported target and report useful gaps. A good report includes the operating system and architecture, `go version`, the exact command, and a minimal reproduction or diagnostic output. Ordinary portability reports belong on the canonical Gitea project. Suspected vulnerabilities must use the private route in [SECURITY.md](../SECURITY.md). Community reports can reveal gaps and help prioritize future work. They do not constitute an independent audit, create a support promise, or shift responsibility for security review, triage, fixes, and release decisions.