During 2024-11, SoftDevSix/Argos delivered a centralized and robust lexer error-handling layer, enhancing the parser feedback loop. Key outcome: ArgosErrorListener (renamed from CustomErrorListener) now throws precise AntlrException types for syntax and ANTLR-related errors, enabling LexerFileProcessor to surface clearer, actionable messages to developers and users. This reduces debugging time and improves user-facing error clarity for invalid inputs. The effort included targeted code cleanup to streamline error output and maintainability (e.g., removing extraneous comments). Related commits include renaming to ArgosErrorListener, adding runtime exceptions to the listener, and cleanup work. Top 3-5 achievements: - Implemented ArgosErrorListener to centralize and clarify lexer error handling (renamed from CustomErrorListener) - Introduced specific AntlrException types for syntax and ANTLR-related errors to improve diagnostics - Integrated error reporting with LexerFileProcessor to deliver clearer messages - Added runtime exceptions to the error listener for more precise failure reporting - Performed code cleanup to reduce noise in error logs (remove comments)