claim ohm session 0091 (placeholder) + sessions.json entry

ohm/0091/SESSION-0091.0-TRANSCRIPT-2026-06-08T21-52--INPROGRESS.md

@@ -0,0 +1,33 @@
+# Session 0091.0 — Transcript
+
+> App: ohm
+> Start: 2026-06-08T21-52 (PST)
+> Type: planning-and-executing
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0091 for ohm. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0091.0-TRANSCRIPT-2026-06-08T21-52--<end>.md form at session end.
+
+## Launch prompt
+
+```
+Fix G-15: make the branch/edit/body subsystem three-tier (collection/project) aware.
+
+§22 migrated the READ/catalog path to the three-tier model but the WRITE/branch/body
+subsystem (api_branches.py, api_graduation.py, bot.py) is still hardcoded to the default
+project's default collection. _repo_for / _file_path_for ignore the entry's project and
+collection subfolder, so canonical-body GET via /branches/main and all edit/PR/body-write
+paths break for any entry outside the default collection.
+
+Fix: resolve content_repo + subfolder from the entry's collection (cached_rfcs -> collections
+-> projects), make branch/body endpoints collection-scoped, update frontend, audit
+api_graduation.py + bot.py. Ship to OHM after.
+
+```
+
+## Deferred decisions
+
+_Autonomous-mode low-confidence calls the driver made and would have
+liked operator input on. Appended as the session runs; surfaced at
+finalize. Empty if none._