diff --git a/dev-claude-plugin/0054/SESSION-0054.0-TRANSCRIPT-2026-06-10T08-24--INPROGRESS.md b/dev-claude-plugin/0054/SESSION-0054.0-TRANSCRIPT-2026-06-10T08-24--INPROGRESS.md
new file mode 100644
index 0000000..e36a409
--- /dev/null
+++ b/dev-claude-plugin/0054/SESSION-0054.0-TRANSCRIPT-2026-06-10T08-24--INPROGRESS.md
@@ -0,0 +1,24 @@
+# Session 0054.0 — Transcript
+
+> App: dev-claude-plugin
+> Start: 2026-06-10T08-24 (PST)
+> Type: brainstorming
+> Claude-Session: a23043e5-f4ca-4e1e-85db-bc7864ffd313
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0054 for dev-claude-plugin. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0054.0-TRANSCRIPT-2026-06-10T08-24--<end>.md form at session end.
+
+## Launch prompt
+
+```
+Let's brainstorm the solution design for #78 — canonical issue-type taxonomy definition (the unblocker of Epic #77; promote the proposals/capture-phase RFC §4 sizing test to canonical handbook practice), then #79 (validation automation, blocked by #78)
+
+```
+
+## 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._
diff --git a/dev-claude-plugin/sessions.json b/dev-claude-plugin/sessions.json
index e21ba61..16dfa71 100644
--- a/dev-claude-plugin/sessions.json
+++ b/dev-claude-plugin/sessions.json
@@ -157,5 +157,8 @@
   },
   "0053": {
     "title": ""
+  },
+  "0054": {
+    "title": ""
   }
 }