Remove methods like ==(::Py, ::Number) and +(::Number, ::Py)

These are handy but they break the general model that a Python int is not a Julia Integer etc.

For example we currently have Py(3) == 3 but hash(Py(3)) != hash(3), which breaks a Julia invariant.

I suspect it might lead to method invalidations too but I don't know.

@codex

@codex can you make a pr to implement this

Summary

Restricted comparison and arithmetic overloads to Py arguments so that mixed Py/Number operator methods are no longer provided by default. src/Core/Py.jlL365-L400
Updated the arithmetic and logic documentation to clarify that Julia operators delegate to Python only when all operands are Py values and to recommend using the explicit py* helpers for mixed inputs. docs/src/pythoncall-reference.mdL102-L149
Revised broadcast tests to operate purely on Python objects and added assertions that Julia number interop now raises MethodError, ensuring the new behaviour is covered. test/Core.jlL786-L803

Testing

⚠️ julia --project -e 'using Pkg; Pkg.test()' (fails because julia executable is unavailable in the environment)

Closed by #709

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