Document sibling registry establishment and sync hub sources

Record bootstrap of state-hub, feature-control, identity-canon, and shard-wiki
registries; hub sync materializes URL sources for all five federated repos.

history/2026-06-17-sibling-registry-established.md

@@ -0,0 +1,29 @@
+# Sibling capability registries established
+
+**Date:** 2026-06-17  
+**Method:** `reuse-surface establish --scaffold` + entry migration from reuse-surface by `owner`
+
+## Repos bootstrapped
+
+| Repo | Capabilities | Commit | Raw URL status |
+|---|---|---|---|
+| `state-hub` | 2 | `70df013` | HTTP 200 |
+| `feature-control` | 3 | `82c7884` | HTTP 200 |
+| `identity-canon` | 2 | `c66bebc` | HTTP 200 |
+| `shard-wiki` | 8 | `b31e9bc` | HTTP 200 |
+
+Entries were copied from `reuse-surface/registry/capabilities/` where `owner` matched the
+sibling repo slug. All repos passed `reuse-surface validate --root <repo>`.
+
+## Federation
+
+- Local `registry/federation/sources.yaml` — sibling `index` sources enabled
+- `reuse-surface federation compose` — 35 capabilities (15 duplicate IDs warned across
+  reuse-surface + shard-wiki/wiki entries still present in both indexes)
+- Production hub `https://reuse.coulomb.social` — registered all four siblings;
+  `GET /v1/federated` returned **27** capabilities across **5** repos
+
+## Follow-up
+
+- Deduplicate wiki capabilities still listed in reuse-surface index vs shard-wiki canonical index
+- Remove migrated entries from reuse-surface index when owners agree on single source of truth

history/README.md

@@ -7,4 +7,5 @@ in `INTENT.md`; living delta tracking in `docs/IntentScopeGapAnalysis.md`.
 | Date | Artifact | Summary |
 |---|---|---|
 | 2026-06-15 | [2026-06-15-intent-scope-assessment.md](2026-06-15-intent-scope-assessment.md) | Post-WP-0011 INTENT↔SCOPE assessment; priorities 18–23 |
-| 2026-06-16 | [2026-06-16-hub-registration-blocks.md](2026-06-16-hub-registration-blocks.md) | Sibling hub registration blocks; raw URL probe evidence |
+| 2026-06-16 | [2026-06-16-hub-registration-blocks.md](2026-06-16-hub-registration-blocks.md) | Sibling hub registration blocks; raw URL probe evidence |
+| 2026-06-17 | [2026-06-17-sibling-registry-established.md](2026-06-17-sibling-registry-established.md) | establish --scaffold + hub registration for four siblings |