history(SHARD-WP-0013 T3): reuse-surface gap proposals + consumptions; derived-views registered

Registered capability.wiki.derived-views in reuse-surface (8 wiki.* total, index 20,
validate ok, pushed d985e68). Tracked contributions note (history/260615-...): proposes
two cross-cutting gaps to reuse-surface (G1 typed-extension-framework, G2
translation-fidelity) and records consumptions (feature-control.evaluate,
authorization.policy-evaluate). Sent to the reuse-surface agent via send_message. Marks T3 done.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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.

history/README.md

@@ -16,3 +16,4 @@ design evolution.
 |------|--------|---------|
 | 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` |
+| 2026-06-15 | `260615-reuse-surface-contributions.md` | shard-wiki's reuse-surface registrations, proposed gaps (G1/G2), and consumptions (`SHARD-WP-0013` T3) |

spec/UseCaseCatalog.md

@@ -45,6 +45,71 @@ of the shard-spectrum work; E–G carry the c2/yawex authoring and reading patte
 
 ---
 
+## Capability structure for the wiki engine (reuse-surface-aligned)
+
+*Added by SHARD-WP-0013 T2 — a structural **layer over** the thematic catalog (UC IDs unchanged),
+mapping the 84 UCs onto a small **engine core** plus **typed, per-shard-activatable extensions**.
+This is the bridge from demand (UCs) to the engine's typed-extension model
+(`WikiEngineCoreArchitecture.md`, T5) and is aligned with the shard-wiki capability entries on the
+reuse surface (`capability.wiki.*`).*
+
+**Reading rule:** the engine is a **small always-on core**; everything else is a **typed extension
+a shard activates only if it needs it** (the activation mechanism itself reuses
+`capability.feature-control.evaluate`). "Default" = on/off for a standalone single-shard wiki.
+
+### Engine core (always on — the irreducible kernel)
+
+| Core unit | What it is | UCs | reuse-surface |
+|-----------|------------|-----|---------------|
+| **EC-1 Page lifecycle & content** | author / read / edit a Markdown page; delete is a history event | UC-08, UC-09 | `capability.wiki.page-model` |
+| **EC-2 Identity, naming & placement** | stable page identity ≠ placement; namespace/path | UC-22 (placement), page-model kernel | `capability.wiki.page-model` |
+| **EC-3 History & recoverability** | every write recoverable; history is the floor | UC-24 | `capability.wiki.coordination-journal` |
+| **EC-4 Links (wikilink + red-link)** | `[[Target]]` resolution; createable red-links | UC-23 | `capability.wiki.page-model` |
+| **EC-5 Storage via the adapter contract** | the engine *is* a canonical-mode shard behind §A | — | `capability.wiki.adapter-contract` (minimal profile) |
+
+EC-1…EC-5 are the Ward-Cunningham/c2 open-wiki minimum: write a page, link pages, never lose
+an edit. A shard can run with **only** the core.
+
+### Typed extensions (activate per shard)
+
+| Ext | Cluster | UCs | reuse-surface capability | Activatable | Default (standalone) |
+|-----|---------|-----|--------------------------|-------------|----------------------|
+| **X-OVERLAY** | overlay / lightweight-patch write path | UC-04, 26, 29 | `capability.wiki.overlay` | yes | on (no-op without remote/limited targets) |
+| **X-AUTHZ** | access-control ladder L0→L4 | UC-06 + the L-ladder | `capability.authorization.policy-evaluate` (reuse) | yes (tiered) | L0 (open) |
+| **X-VIEW** | derived views (RecentChanges, BackLinks, AllPages, SiteMap, Search) | UC-17–UC-21, UC-63 | (planned `capability.wiki.derived-views` — gap, T3) | yes | BackLinks/RecentChanges on; Search off |
+| **X-STRUCT** | structured / typed / computed page data + typed-graph | UC-34, 39, 58, 67, 73 | `capability.wiki.page-model` (typed) | yes | off |
+| **X-ADDR** | span addressing, transclusion, dimensional / query navigation | UC-32, 44–49, 51, 52, 74 | `capability.wiki.page-model` + query | yes (transclusion is core-lite) | transclusion on; dimensional/query off |
+| **X-COMP** | computational / executable content (literate, notebook, program-as-page, live) | UC-54, 55, 83, 84 | `capability.wiki.engine-typed-extensions` (computational) | yes (gated, trust/sandbox) | off |
+| **X-PROV** | rich provenance & page metadata | UC-25, 75 | `capability.wiki.page-model` (provenance) | yes (base provenance is core) | base on; rich off |
+| **X-COLLAB** | c2 collaboration / social patterns | UC-10–UC-16 | (UI/convention; partial gap, T3) | yes | varies (mostly UI-layer) |
+| **X-FED** | federation & union across shards | UC-01–07, 27, 28, 30–33, 56, 71, 72, 79 | `capability.wiki.shard-orchestration` + `…federation-models` | yes | off (single-shard engine) |
+| **X-ATT** | attach *foreign* backends as shards | UC-35–43, 50, 53, 57, 60–62, 64–66, 68–70, 76–82 | `capability.wiki.adapter-contract` | yes | off (orchestrator role, not the engine's own shard) |
+
+Note: X-FED and X-ATT are the **orchestrator** capabilities — for a *standalone* engine they are
+off; when shard-wiki orchestrates, the engine is simply one attached (canonical) shard among many.
+That is the engine↔orchestrator boundary made concrete (engine = a canonical-mode shard).
+
+### Conflict-mediation map (how the framework reconciles tensions into one whole)
+
+The collected UCs embed genuinely conflicting requirements. The framework mediates each with a
+**mechanism**, never a hard-coded policy — so one consistent featureset serves all:
+
+| Tension (conflicting UCs) | Mediation mechanism |
+|---------------------------|---------------------|
+| **Open vs governed** (UC-01 open edit ↔ UC-06 enterprise ACL) | the **L0→L4 authz ladder** (X-AUTHZ, additive); **history is the floor** at L0 — recoverability, not gatekeeping |
+| **Lossless vs lossy content** (UC-42 ↔ UC-59) | **translation spectrum + fidelity report** (TSD §A.6); native form stays canonical, loss is shown not hidden |
+| **Live vs snapshot** (UC-32 live transclusion ↔ UC-84/UC-3 cached) | the **live↔snapshot axis** + projection kind; degrade to a **marked** snapshot, never imply live |
+| **Canonical vs chorus** (UC-07 reconcile ↔ UC-27 coexist) | **conflict detection is core, resolution is a policy preset** (chorus / designated-canonical / …) |
+| **Eager vs lazy** (UC-03 projection ↔ UC-05 union) | **projection materialization** policy (lazy default; eager opt-in) |
+| **Single vs multi-writer** (concurrent edits) | **per-space append authority** on the coordination journal (total order, read-your-writes) |
+| **Integrated whole vs only-what-you-need** | the **typed-extension framework** + **per-shard activation** (reuse `feature-control`) — *the headline mediation*; extensions compose against typed contracts, so the featureset is one integrated whole yet selectively enabled |
+| **Minimal core vs feature-rich** | **small core (EC-1…EC-5)** + extensions; nothing beyond the c2 minimum is mandatory |
+
+This table is the seed of the engine's design rationale (T5): every conflict has a *mechanism*
+that lets a shard sit anywhere on the spectrum without forking the framework.
+
+---
+
 ## A. Information space, federation & coordination
 
 *Federation, union, overlay, projection, and the Git-backed coordination layer (INTENT + yawex/federation seeds).*

workplans/SHARD-WP-0013-wiki-engine-prep.md

@@ -88,7 +88,7 @@ capabilities visible + assessable on the reuse surface.
 
 ```task
 id: SHARD-WP-0013-T2
-status: todo
+status: done
 priority: high
 state_hub_task_id: "d83d0f96-7d95-405e-93cf-03314ab34636"
 ```
@@ -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"
 ```