v0.1.2 — Fix buffer leak and null pointer dereference Fixed: - Buffer leak in Diff#patch and Patch#to_s when an exception was raised after git_patch_to_buf but before git_buf_dispose - Segfault in Error.last when no libgit2 error was pending (null pointer dereference) Added: - Error.check! — raises the last error if one is pending (replaces Error.raise?) - Error.clear — wraps git_error_clear() to reset pending error state Changed: - TagCollection#exist? is now O(1) via git_reference_lookup instead of iterating all tags Deprecated: - Error.raise? — use Error.check! instead (emits compile-time warning)