andrexibiza's F15 (changed form, inline on py_rules.py:250): body_hash()
disabled self-reference normalization whenever the textual dump contained
`arg('<name>'` or `Name('<name>', Store())` anywhere in the subtree, so an
unrelated nested `def identity(legacy)` made a pure recursive rename of
`legacy` lose its cap (FUNC_LINES 302 > target 300 as new code). Even with
the check removed, the string replace would also have blanked the nested
function's own `return legacy`, which refers to its parameter.
References are now resolved lexically: only bindings in the function's own
scope (params, assignments, nested def/class names, imports, global/nonlocal,
except/match captures) disable normalization, and a nested def/lambda/class/
comprehension that binds the name keeps its own reads. The matched Name /
Attribute nodes are blanked in place for the dump and restored. Controls: a
rename that leaves the old self-call is different code, an own-scope rebinding
is not a self-reference, a closure's call to its enclosing function is.
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