b161f2a059
Initial release. Statically vendors libgit2 v1.7.2 (HTTPS-only via WinHTTP on Windows, no SSH dependency); exposes synchronous clone, checkout, fetch, describe, has_ref, is_repo, tags plus an async start_ls_remote_tags / is_done / take_result triple routed through the engine async-pool. The native-lib loader resolves engine services through the sporel_engine_api struct passed to sporel_lib_init, so this lib does not statically depend on internal engine symbols beyond the Lua C-API re-exports. Smoke-tested against a public Gitea repo: clone over HTTPS succeeds, async ls-remote returns the tag list, all C-allocations clean up via git_*_free / git_buf_dispose. First clean build of libgit2 takes ~5-15 min on a typical machine; cached afterwards.