Return the materialized path for a thread transcript.

Return the materialized path for a subagent transcript.

Append redacted message projections to the in-memory buffer.

Flush pending records and return the client-readable path.

Materialization rewrites the whole per-thread JSONL file, so it runs under a cross-process advisory lock and re-reads the on-disk records first, merging in anything another dcode process appended since this process last loaded the file.

Return the current revision id without forcing a flush.