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docs: specification of the Python §4 environment stepper (#532)

* docs: specification of the Python §2 stepper

Modelled on js-slang's source_2_stepper: reduction rules, substitution,
free names, plus the step numbering and step limit.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs: specification of the Python §4 environment stepper

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): state store changes as effects, without a store function Σ

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): say frames and heap instead of store

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): the global frame grows, and global/nonlocal names are designated by the function

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): the builtins environment is the parent of the global frame

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): assigning to a builtin name shadows it in the global frame

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): describe name resolution as LEGB

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs(estepper): example of shadowing a builtin

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

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