fix: use removesuffix("Def") instead of [:-3] for elementKind extraction

[Copilot]

node.__class__.__name__[:-3] used a magic number to strip "Def" from AST node class names (FunctionDef, AsyncFunctionDef, ClassDef). While correct, it silently truncates incorrectly for any class name not ending in exactly 3 chars.

Change

• Replace [:-3] with .removesuffix("Def") — explicit about what's being stripped, no-op for names that don't end in "Def"

# Before
"elementKind": node.__class__.__name__[:-3].upper()

# After
"elementKind": node.__class__.__name__.removesuffix("Def").upper()

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