claim ecomm session 0020 (placeholder) + sessions.json entry

ecomm/0020/SESSION-0020.0-TRANSCRIPT-2026-06-10T06-52--INPROGRESS.md

@@ -0,0 +1,24 @@
+# Session 0020.0 — Transcript
+
+> App: ecomm
+> Start: 2026-06-10T06-52 (PST)
+> Type: brainstorming
+> Claude-Session: 70151e40-bc9e-4ddb-b5ab-20996158978f
+> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
+>
+> This file reserves session ID 0020 for ecomm. The driver replaces this
+> body with the full transcript and renames the file to its final
+> SESSION-0020.0-TRANSCRIPT-2026-06-10T06-52--<end>.md form at session end.
+
+## Launch prompt
+
+```
+/goal Brainstorm and spec ecomm Feature #1 (https://git.wiggleverse.org/wiggleverse/wiggleverse-ecomm/issues/1 — MVP: sign up and create a single storefront, incl. the localhost/PPE/Prod bootstrap story): design the architecture and write the Solution-Design spec, drawing on the reference impl (`wiggleverse-ecomm-prototype`) and the harvested Shopify BDD corpus (`wiggleverse-ecomm-prototype-content/research/shopify`) as inputs; submit the spec to `wiggleverse-ecomm-content/specs/`.
+
+```
+
+## 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._

ecomm/sessions.json

@@ -55,5 +55,8 @@
   },
   "0019": {
     "title": ""
+  },
+  "0020": {
+    "title": ""
   }
 }