kettle-rb / tree_haver / 20837809308 / 1

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🔥 Remove defensive code, and unused specs

### Changed

- **TreeHaver::Node**: Removed defensive `respond_to?` checks from `has_error?` and `missing?` methods
  - All tree-sitter backends (MRI, Rust, FFI, Java) must implement these methods on their inner nodes
  - This enforces proper backend API compliance rather than silently masking missing implementations

### Fixed

- **FFI Backend**: Added explicit boolean conversion (`!!`) to `has_error?` return value
  - FFI `:bool` return type may behave inconsistently across Ruby versions and platforms
  - Ensures `has_error?` always returns `true` or `false`, not truthy/falsy values

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