524c6f1eb4
Captures the four grey areas team-lead flagged in the sprint 0 brief (regex_extract semantics, output_blob_ref storage, /hosts/sync merge behaviour, payload_type↔home-C2 mapping) plus stale-host policy. No decisions taken: each entry lists options, a recommended default if no decision is reached, and a "becomes blocking when…" trigger. Resolved questions will move to spec-decisions.md as D-NNN entries.