Matches the codebase convention (LLMError, FileSystemError, AuthError, etc. all use Schema.TaggedErrorClass). Adds SecretFindingSchema so the findings field on UnsafeCassetteError has a real Schema rather than an opaque type.
Matches the codebase convention (LLMError, FileSystemError, AuthError, etc. all use Schema.TaggedErrorClass). Adds SecretFindingSchema so the findings field on UnsafeCassetteError has a real Schema rather than an opaque type.