giles 3ae49b69f5 Fix env-shadowing: rebind host extension points after .sx file load ...

evaluator.sx defines *custom-special-forms* and register-special-form!
which shadow the host's native bindings when loaded at runtime. The
native bindings route to Sx_ref.custom_special_forms (the dict the CEK
evaluator checks), but the SX-level defines create a separate dict.

Fix: rebind_host_extensions runs after every load command, re-asserting
the native register-special-form! and *custom-special-forms* bindings.

Add regression test: custom form registered before evaluator.sx load
survives and remains callable via CEK dispatch afterward.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-24 18:29:29 +00:00

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