diff --git a/SCOPE.md b/SCOPE.md
index 4fcde12..a6cb1f4 100644
--- a/SCOPE.md
+++ b/SCOPE.md
@@ -90,6 +90,15 @@ their own repositories and are referenced here only as integration pointers.
 - Status: **stable maintenance** — governance substrate in daily ecosystem use.
   No `active`/`ready`/`blocked` CUST-WP workplans; one `proposed` plan
   (`CUST-WP-0055` terminology refactor) awaits review before pickup.
+- Business platform enablement (`CUST-WP-0058`, finished 2026-07-10):
+  DR-1/2/3 resolved (instance-per-client tenancy; coulomb.social as
+  standalone app; app-local identity), business-app service contract
+  accepted (`canon/standards/business-app-service-contract_v0.1.md`),
+  client-hub scoped, delivery lane validated (vergabe-teilnahme conformance
+  snapshot). Open cross-repo handoffs: cnpg backups (railiance-apps,
+  **HIGH**), tenant keying + runbook (vergabe-teilnahme), FIN-WP-0002
+  (fin-hub), CLNT-WP-0001 (core-hub), coulomb.social rebuild seed
+  (`docs/coulomb-social-rebuild-seed.md`).
 - Recent closeouts (archived 2026-07-08): `CUST-WP-0025` FOS hub bootstrap
   (identity, hub-core extraction, Core Hub ops lane, fin-hub MVP);
   `CUST-WP-0054` workstation independence; `CUST-WP-0051` infrastructure
diff --git a/docs/coulomb-social-rebuild-seed.md b/docs/coulomb-social-rebuild-seed.md
new file mode 100644
index 0000000..f83fbc3
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+++ b/docs/coulomb-social-rebuild-seed.md
@@ -0,0 +1,47 @@
+# coulomb.social Rebuild — Workplan Seed
+
+**Created:** 2026-07-10 (CUST-WP-0058-T08 closeout)
+**Decision basis:** DR-2 B — standalone application; DR-1 C tenancy;
+DR-3 A app-local accounts. Contract:
+`canon/standards/business-app-service-contract_v0.1.md`.
+
+## Status
+
+Seed only — **no owning repo exists yet.** When the rebuild starts, create
+the repo (suggested slug `coulomb-social`), register it
+(`custodian register-project`, domain `coulomb_social`), and originate the
+workplan files there per ADR-001. This document then becomes a pointer.
+
+## Shape (decided)
+
+Standalone service on the proven business delivery lane
+(vergabe-teilnahme evidence:
+`docs/evidence/vergabe-teilnahme-delivery-lane-20260710.json`):
+own repo → commit-SHA images → `gitea.coulomb.social/coulomb/coulomb-social`
+→ railiance-apps release values → railiance01. Binky Hedgehog GmbH is the
+client (client #1 model). App-local member accounts (DR-3 A; §2.3 bounded
+auth module for a later OIDC switch).
+
+## Proposed workplan skeletons
+
+```
+CSOC-WP-0001 — bubble.io exit assessment
+  T01  Inventory current bubble.io app: pages, workflows, data types,
+       integrations, external services (todo, high)
+  T02  Data export: full dump from bubble.io, schema mapping to a
+       relational model (todo, high)
+  T03  Feature cut decision: rebuild-as-is vs reduced v1 scope
+       (human gate — Bernd) (wait, high)
+  T04  Migration rehearsal: import exported data into the v1 schema on a
+       dev instance (todo, medium)
+
+CSOC-WP-0002 — coulomb.social v1 implementation
+  (scoped after CSOC-WP-0001-T03; must satisfy service contract §1–§6,
+   incl. tenant keying from migration one and member-account export/delete)
+```
+
+## Preconditions before serving members
+
+- railiance-apps backup gap closed (§4.2 — HIGH, msg `a1957cce…`)
+- ops-hub registration at deploy (§4.1)
+- fin-hub cost attribution key (§5.1, FIN-WP-0002)
diff --git a/workplans/CUST-WP-0058-business-platform-enablement.md b/workplans/archived/260710-CUST-WP-0058-business-platform-enablement.md
similarity index 100%
rename from workplans/CUST-WP-0058-business-platform-enablement.md
rename to workplans/archived/260710-CUST-WP-0058-business-platform-enablement.md