diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -13,3 +13,8 @@ make -C history/FIAM_v0.2_Draft6 check
 
 Normative releases should be promoted into a versioned top-level release
 layout; `history/` remains reserved for superseded drafts.
+
+## InterfaceCanon boundary
+
+See the [accepted InterfaceCanon derivation review](docs/interface-canon-boundary.md)
+for source revisions, findings, and the scope of acceptance.
diff --git a/docs/interface-canon-boundary.md b/docs/interface-canon-boundary.md
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+# InterfaceCanon derivation boundary
+
+Status: accepted for the reviewed draft derivation and authority boundary.
+Reviewer: Codex acting for facetted-interfaces under the repository task request.
+Review date: 2026-09-09.
+
+Reviewed InterfaceCanon interface-model 0.1.1 at
+`1fc82ec6655ed286cea3be284e33d08e7b27edc3`, specifically
+`infospace/models/interface/InterfaceCanonInterfaceModel.md` and
+`infospace/assimilation/fiam/sources.json`. Request package:
+`6b33ac2388190207c4373e6f288922ce5c0b0413`, INTERFACE-WP-0004-T01;
+State Hub request `cb3a7690-f145-4559-969f-c6f800994de0`.
+
+InterfaceCanon translates FIAM interface terminology into a focused extension
+to InfoTechCanon. FIAM retains authority over standard semantics, Core schemas,
+controlled terms, profiles, policies, reference implementation, and conformance.
+InterfaceCanon owns its derived presentation and cross-canon mappings.
+
+The consumer pins FIAM v0.2 Draft 6 at
+`135326756913363b098bcdee791628b5e864b8be`, including the retained Draft 1
+explanation, frozen Core schema, and Canon. All four source manifest hashes
+were verified against that commit.
+
+## Review findings
+
+| Distinction | FIAM evidence | Assessment |
+| --- | --- | --- |
+| Contract versus binding | Core `contractParticipation`, `binding`; Draft 1 structural spine | Preserved; offers/requires concerns participation and multiple realizations can share a contract. |
+| Endpoint versus resource selector | Core `endpoint`, `resourceSelector`, `binding.endpoints` | Preserved; endpoint reuse does not imply resource identity. |
+| Channel versus retained resource | Draft 1 structural spine and Kafka example | Preserved; exchange and retained information remain distinct roles. |
+| Shape versus artifact versus representation | Core `informationShape`; Draft 1 hardening §§3–5 | Preserved; representation remains scoped to shape-participation assertions. |
+| Assertions versus lens conclusions | Core `assertion`; Draft 6 §§1, 6–7 | Preserved; unknown evidence and policy-dependent interpretations remain explicit. |
+
+No blocking semantic corrections were found in this reviewed model. Its prose
+is an explanatory summary: exact required fields, optionality, controlled terms,
+and validation remain governed by FIAM's source artifacts and validators.
+
+Acceptance is limited to fidelity of this derivation and its authority boundary.
+It does not promote either draft to stable, certify consumer runtime conformance,
+or change the identity/commerce ownership ledger. Future source revisions need
+a new review. This document is the repository's review receipt; its Git commit
+identifies the applied peer change.
diff --git a/workplans/FIAM-WP-0002-interface-canon-boundary-review.md b/workplans/FIAM-WP-0002-interface-canon-boundary-review.md
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@@ -0,0 +1,46 @@
+---
+id: FIAM-WP-0002
+type: workplan
+title: "Review and apply InterfaceCanon derivation boundary"
+domain: infotech
+repo: facetted-interfaces
+status: finished
+owner: codex
+topic_slug: canon
+created: "2026-09-09"
+updated: "2026-09-09"
+spec_refs:
+  - INTENT.md
+  - docs/interface-canon-boundary.md
+---
+
+# FIAM-WP-0002 — InterfaceCanon boundary review
+
+Handle State Hub request `cb3a7690-f145-4559-969f-c6f800994de0` from
+interface-canon for INTERFACE-WP-0004-T01.
+
+## T01 — Review pinned derivation and source provenance
+
+```task
+id: FIAM-WP-0002-T01
+status: done
+priority: high
+```
+
+Compared interface-model 0.1.1 at `1fc82ec6655ed286cea3be284e33d08e7b27edc3`
+with FIAM Core and Draft 1/Draft 6 explanations. Verified all four manifest
+source hashes against FIAM commit `135326756913363b098bcdee791628b5e864b8be`.
+The five requested semantic distinctions are preserved; no blocking corrections.
+
+## T02 — Apply boundary document and record acceptance
+
+```task
+id: FIAM-WP-0002-T02
+status: done
+priority: high
+```
+
+Added `docs/interface-canon-boundary.md` and README navigation. The receipt
+records reviewer identity, exact revisions, evidence, and limited acceptance.
+Validated source locators and local document links. No runtime changes.
+The review is available to the requesting repository in this committed receipt.