v0.1.31

Added

• Structured doc tag parsing — Javadoc @param/@return, JSDoc @param {type}/@returns {type}, YARD @param [Type] now populate structured concept.params and concept.returns. Applies to Java, JS/TS, Ruby.
• Go const/var declarations — package-level const and var bindings extracted as Constant/Variable concept types with type annotations and values.
• Ruby singleton methods — def self.foo extracted as Function concepts with self. prefix in signature and singleton visibility tag.
• C++ full template signatures — template<typename T> prefix now appears in class/function signatures (e.g. template<typename T> class Container).

Changed

• Concept dataclass: 2 new concept types (Constant, Variable) added to index renderer.
• GoParser refactored: _prev_comment extracted once per node to avoid UnboundLocalError with new declaration types.

---