api-compat-review

Backward-compatibility review of changes to a project's public surface. Use when a diff changes exported function or type signatures, renames or removes public symbols, changes a default value, alters config keys, environment variables, or CLI flags, modifies an HTTP or wire format, migrates a database schema, changes exception or error types, touches plugin or extension hooks, or whenever a PR proposes a major-version bump. Establishes what the project actually promises, diffs the public surface between base and head with language-native tooling, classifies each change against a breaking-change taxonomy, and requires a migration path before a break may land. Language-agnostic. Do NOT use for purely internal or private code with no external consumers.