diff --git a/history/260615-reuse-surface-contributions.md b/history/260615-reuse-surface-contributions.md
new file mode 100644
index 0000000..ca2389e
--- /dev/null
+++ b/history/260615-reuse-surface-contributions.md
@@ -0,0 +1,45 @@
+# reuse-surface contributions — shard-wiki (SHARD-WP-0013 T3)
+
+Date: 2026-06-15 · From: shard-wiki (whynot) · To: reuse-surface (helix_forge) · Tracked list
+of (A) capabilities shard-wiki registered, (B) **gaps** shard-wiki proposes the reuse surface
+add, and (C) capabilities shard-wiki will **consume** rather than rebuild. Communicated to the
+reuse-surface agent via state-hub `send_message`.
+
+## A. Registered (T1 + T3) — 8 entries
+
+`capability.wiki.{shard-orchestration, adapter-contract, page-model, coordination-journal,
+overlay, federation-models, engine-typed-extensions, derived-views}` — committed in
+reuse-surface, `validate` ok (20 entries total).
+
+## B. Proposed gaps (cross-cutting; not shard-wiki-internal) → reuse-surface should own/define
+
+- **G1 — `capability.platform.typed-extension-framework`** *(suggested)*
+  A reusable pattern: a **small core + a stringent typed-extension framework** where extensions
+  declare typed contracts, compose, and are **activated per context**. shard-wiki's wiki engine
+  (`capability.wiki.engine-typed-extensions`) is one instance, but the *pattern* is
+  cross-domain (any HelixForge capability platform). Evidence: shard-wiki UseCaseCatalog
+  "Capability structure" layer (core + 10 typed extensions + conflict-mediation map).
+  Suggested owner: helix_forge / reuse-surface. Relation: would `generalize`
+  `capability.wiki.engine-typed-extensions`.
+
+- **G2 — `capability.content.translation-fidelity`** *(suggested)*
+  Lossless/lossy **content translation with an explicit fidelity report** (what round-trips
+  cleanly vs degrades, non-mappable elements preserved as provenance). Reusable well beyond
+  wiki (any format-bridging consumer). Evidence: shard-wiki TSD §A.6, UC-42/UC-59.
+
+## C. Consumptions (reuse, do not rebuild)
+
+- **`capability.feature-control.evaluate`** (helix_forge/feature-control) → shard-wiki's
+  **per-shard extension/feature activation** (the "activate only what you need" mechanism).
+  Already recorded as a relation on `capability.wiki.engine-typed-extensions`.
+- **`capability.authorization.policy-evaluate`** (flex-auth) → shard-wiki's **X-AUTHZ** policy
+  decisions. shard-wiki owns the authz *model* (authz-in-core) but can reuse this evaluation
+  engine rather than building one.
+- **`capability.statehub.{progress-log, workstream-coordinate}`** → already in use for
+  coordination across this work.
+
+## Status
+
+Gaps G1/G2 are **suggestions** to the reuse-surface owner (not unilateral registrations, since
+they are cross-cutting, not shard-wiki-internal). Consumptions are recorded for the engine
+architecture (T5) so it reuses rather than reinvents.
diff --git a/history/README.md b/history/README.md
index f1b9f39..d1b57b2 100644
--- a/history/README.md
+++ b/history/README.md
@@ -15,4 +15,5 @@ design evolution.
 | Date | Record | Subject |
 |------|--------|---------|
 | 2026-06-15 | `260615-core-architecture-blueprint-review.md` | Critical review of `spec/CoreArchitectureBlueprint.md` (commit 9b5b393); inputs to `SHARD-WP-0005` |
-| 2026-06-15 | `260615-core-architecture-blueprint-review-2.md` | Round-2 review of the hardened blueprint (post-`SHARD-WP-0005`, f21b7b5); inputs to `SHARD-WP-0006` |
\ No newline at end of file
+| 2026-06-15 | `260615-core-architecture-blueprint-review-2.md` | Round-2 review of the hardened blueprint (post-`SHARD-WP-0005`, f21b7b5); inputs to `SHARD-WP-0006` |
+| 2026-06-15 | `260615-reuse-surface-contributions.md` | shard-wiki's reuse-surface registrations, proposed gaps (G1/G2), and consumptions (`SHARD-WP-0013` T3) |
\ No newline at end of file
diff --git a/workplans/SHARD-WP-0013-wiki-engine-prep.md b/workplans/SHARD-WP-0013-wiki-engine-prep.md
index fdc9148..fd42dc9 100644
--- a/workplans/SHARD-WP-0013-wiki-engine-prep.md
+++ b/workplans/SHARD-WP-0013-wiki-engine-prep.md
@@ -105,7 +105,7 @@ open-vs-governed, lossless-vs-lossy, live-vs-snapshot) and **how the framework m
 
 ```task
 id: SHARD-WP-0013-T3
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "06b62406-39e7-4227-bcc6-f9cab1c28996"
 ```