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e-stepper: follow the wording of SICPy §3.2 (#544)

* e-stepper: a tail call says E1 is no longer needed here, not in the program

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

* e-stepper: follow the book's wording: built-in, and a new frame's enclosing environment

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

* e-stepper: a call creates a new environment whose enclosing environment is the global environment (3.2.1)

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

* e-stepper: environments for calls and function objects, frames for bindings (3.2.1)

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

* e-stepper: the new frame would have no bindings

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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