JSON session documents and the coding-host JSONL journal

rho_json_session_codec() contains an explicit registry of stable semantic record types. A RhoJsonSemanticAdapter maps one stable wire tag and field set to the current in-memory S7 class. Package names, S7 class names, and reflected property sets are never written to the journal. An extension adds a value by supplying rho_json_semantic_adapter() with its own stable tag and explicit fields.

Details

rho_encode_session_value() and rho_decode_session_value() retain R atomic storage modes, list names, missing values, and registered semantic values. Unknown S7 objects resolve to RhoSessionCodecErrorValue rather than acquiring an accidental storage schema from the current package namespace.

rho_jsonl_session_journal() implements the SessionJournal interface as a coding-host adapter. File reads, locking, validation, and append run in mirai workers. Each LF-delimited entry record carries a committed position and typed entry document. A file lock and the append request's expected position reject stale writers before mutation. A missing final LF, malformed record, or invalid semantic document resolves to a typed error value.