- Python, Ruby and Julia each carried their own copy of the same session
maps, acquire/reset/replace/dispose lifecycle and executeOnSession; one
generic registry now owns it, parameterized by a per-language descriptor.
- Julia additionally re-implemented seven executor-base helpers locally; those
copies are gone and executor-base gained sparse managed-env and timeout
resolver hooks so Julia's differing behavior survives unchanged.
- All twelve exported entry points keep their names and signatures.
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