One-line register lane: IR-148's Status line is replaced with DONE, as doyle ruled (`E7SPUQM2`). The old line still said the deepen arm was "routed to #261", which has already happened.

- **Headline.** #261's landing push, run 36012418333, hit the #258 stale-object shape: the `before` object was present in the reused workspace and the depth-2 fetch grafted it off. The log now prints `connected_at=deepen50` directly.
- **Both arms were field-witnessed against blind pre-registrations.** step0: run 36011148805. deepen50: run 36012418333, 4/4.
- **deepen500/none are retired to selftest coverage** with a named trigger: a >50-commit ff push, if one is ever shaped, is their acceptance.

Changes `docs/INFRA-REGISTER.md` only (+7/-1); `traceable-reqs check` exits 0. Lands via doyle.

Co-authored by: hertz

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https://claude.ai/code/session_01KR5QdzrHXYGL1djRTBNKEG