claim ohm session 0068 (placeholder) + sessions.json entry

ohm/0068/SESSION-0068.0-TRANSCRIPT-2026-06-03T23-55--INPROGRESS.md

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+# Session 0068.0 — Transcript
+
+> App: ohm
+> Start: 2026-06-03T23-55 (PST)
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0068 for ohm. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0068.0-TRANSCRIPT-2026-06-03T23-55--<end>.md form at session end.
+
+## Launch prompt
+
+```
+Drive the §22 multi-project ("document library") work forward.
+
+Motivating example: make it possible to create a benstull document library
+called `human-filter-experiment` (type: document) in the benstull deployment.
+
+Discovery this session established that the document-library concept does not
+exist in any shipped version: the benstull deployment runs rfc-app 0.31.4 (no
+registry feature), framework `main` has no registry.py, and the registry spine
+lives only on this in-progress branch m3-backend-registry-spine (-> 0.32.0).
+
+Goal: sequence and advance the remaining M3 (and M4+) work so a usable
+document library becomes real, per docs/design/multi-project-spec.md and the
+roadmap.
+
+```