fathom-impact

Narrate fathom's measured impact in this repo, honestly — run fathom instrument --adoption (the flywheel's gauge) plus fathom plans status and the open-observation backlog, and report exactly what those instruments measured, no more. Use when asked "is fathom actually helping here", "what has fathom caught", for a periodic adoption check-in, or before claiming any fathom-driven win in a summary, standup update, or PR description.