Release 0.4.0

Added

• DisplayResolver — sparse binding.yaml overlay that resolves surface-facing alias, description, guidance, tags, and documentation into metadata["display"]. Supports file/directory binding paths, pre-parsed data, MCP alias sanitization, and CLI alias validation.
• SyntaxVerifier — implements Verifier trait, checks .rs files parse without syntax errors via the syn crate.
• deep_resolve_refs() — now public API (was internal). Recursively resolves all $ref pointers in OpenAPI schemas, depth-limited to 16 levels.
• resolve_target() — validates and parses module_path:qualname target strings. Returns ResolvedTarget with module_path and qualname fields.

Fixed

• README: apcore dependency version updated from >= 0.13.0 to >= 0.14 (matches Cargo.toml).
• docs/API_CONTRACT.md: Scanner trait updated to async with generic App parameter; RegistryWriter new() and with_handler_factory() constructors added; AIEnhancer::new return type corrected to AIEnhancerError.