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runtime.sx binds R7RS reflective primitives: - eval EXPR ENV - interaction-environment — returns env captured by closure - null-environment VERSION — fresh empty env (ignores version) - scheme-report-environment N — fresh full standard env - environment? V interaction-environment closes over the standard env being built; each invocation of scheme-standard-env produces a distinct interaction env that returns ITSELF when queried — so user-side (define name expr) inside (eval ... (interaction-environment)) persists for subsequent (eval 'name ...) lookups. 13 tests cover: - eval over quoted forms (literal + constructed via list) - define-then-lookup through interaction-environment - eqv? identity of interaction-environment across calls - sandbox semantics: eval in null-environment errors on + - scheme-report-environment is fresh and distinct from interaction **Second consumer for lib/guest/reflective/evaluator.sx unlocked.** Scheme's eval/interaction-environment/null-environment triple is the same protocol Kernel exposes via eval-applicative / get-current-environment / make-environment. Extraction now satisfies the two-consumer rule — same playbook as env.sx and class-chain.sx, awaits a follow-up commit to actually extract the kit. 270 total Scheme tests (62 + 23 + 49 + 78 + 25 + 20 + 13).