fix(coverage): bind json reader vars dynamically in simplecov parsers

The simplecov parse helpers let-bound json-object-type, json-array-type, and json-key-type around json-read-file to get string-keyed hash tables. Under lexical-binding the compiler hadn't seen json.el's defvars, so it compiled those as lexical bindings that never reached the reader; the compiled helpers got json.el's default symbol-keyed alist and then signaled wrong-type-argument hash-table-p in their maphash. Interpreted code happened to work because the in-function require made the vars special first. Add eval-when-compile (require 'json) so the compiler treats them as dynamic.

Claude-Session: https://claude.ai/code/session_01BqrdWUo9GcznYX2pZr76gZ

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