error on getter/setter methods in class declarations

[cs01]

Summary

Error on getter/setter methods in class declarations. ChadScript doesn't support property accessors—users must use regular public methods instead.

Changes

• Parser (TS): Detect getter/setter declarations and emit compile error with file:line:column location
• Parser (Native): Same detection in native parser with error reporting
• Compiler lib: Set current file path before parsing so error messages have correct file context
• Test: Add fixture expecting compile error on get value()