feat(provenance): v0.0.18 mock runtime integration tests E2E — 9 scenarios canonical own fixtures

Phase 2.1 PROVENANCE pallet — 9 integration tests E2E via FRAME mock runtime
composition (`construct_runtime!` macro + derive_impl + sp_io::TestExternalities).
Cierra honest disclosure sesión 2 ("real chain runtime aún NO arranca"). Pallet
end-to-end validado canonical sin esperar Slice 2e WASM resolution structural.

## 9 integration tests canonical PROV-3 flow

5 scenarios:
- scenario_1_passed_info_anchored_canonical (PROV-2/3/7) ✅
- scenario_2_warning_anchored_canonical (PROV-2/3/6/7) ✅
- scenario_3_failed_critical_rejected_canonical (PROV-6) ❌ NotAnchorable
- scenario_4_passed_block_security_rejected_canonical (PROV-6) ❌ NotAnchorable
- scenario_5_anonymous_level_0_rejected_canonical (PROV-5) ❌ ValidatorTierInsufficient

4 additional:
- additional_idempotency_already_attested_rejected_canonical (PROV-2) ❌ AlreadyAttested
- additional_tampered_signature_rejected_canonical (PROV-4) ❌ InvalidSignature
- additional_tampered_payload_rejected_canonical (PROV-4) ❌ InvalidSignature
- additional_6_step_prov_3_walkthrough_canonical (PROV-3 full) ✅ Pre/post assertions

## Own fixtures canonical

Per audit canonical sesión 3+ (docs/L7_roadmaps/AUDIT_CHARON_SESION_3_STATE_V1.md),
Ergon E2E fixture diary claim aspirational sin shipped commit verified — filesystem
+ git history confirma no source file canonical. Charon construye own fixtures
basados en vendor copy ValidationAttestation real existente. Pattern análogo
Slice 3 mock-WASM + v0.0.16 Ed25519 interim encoding.

## Files canonical

- NEW: crates/origin-chain-provenance/src/mock.rs (75 LOC mock runtime)
- NEW: crates/origin-chain-provenance/src/tests_integration.rs (270 LOC, 9 tests)
- EDIT: crates/origin-chain-provenance/Cargo.toml (sp-core+sp-io+sp-runtime dev-deps)
- EDIT: crates/origin-chain-provenance/src/lib.rs (mod mock + mod tests_integration + docstring v0.0.18)
- EDIT: CHANGELOG.md (v0.0.18 entry canonical pattern Phase 2.1)

## Verification

- cargo test -p origin-chain-provenance — 17 tests verde, 0 failures
  (9 integration + 6 standalone Ed25519 + 2 auto-generated)
- Workspace tests no regressions
- Cero warnings críticos

🎉 Phase 2.1 PROVENANCE pallet validated E2E via mock runtime canonical.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/origin-chain-provenance/src/lib.rs

@@ -1,19 +1,34 @@
-//! # pallet-origin-provenance — Phase 2.1 scaffold v0.0.14
+//! # pallet-origin-provenance — Phase 2.1 COMPLETE + v0.0.18 mock runtime integration tests
 //!
 //! Asset attestation pallet canonical per CHN-7 + DC PROVENANCE_PALLET_V1
-//! (5/10 firmas hoy 2026-05-24, deadline ratificación 2026-05-29).
+//! (6/10 firmas sesión 3+ 2026-05-24, deadline ratificación 2026-05-29).
 //!
-//! ## Status canonical: v0.0.16 — Real Ed25519 verification implementada
+//! ## Status canonical: v0.0.18 — Mock runtime integration tests E2E own fixtures
 //!
 //! Este crate provee:
 //! - Storage layout canonical `StorageMap<AssetHash, AssetAttestation>` (PROV-2) ✅
 //! - Dispatchable canonical `attest_asset(origin, ValidationAttestation)` (PROV-3) ✅
-//! - **Real Ed25519 verify canonical via ed25519-dalek (PROV-4) ✅ v0.0.16**
+//! - Real Ed25519 verify canonical via ed25519-dalek (PROV-4) ✅ v0.0.16
 //! - OIT Level >= 3 enforcement canonical (PROV-5) ✅
 //! - is_anchorable check canonical (PROV-6) ✅
 //! - Events canonical `AssetAttested` + `AttestationRejected` (PROV-7) ✅
 //! - Errors canonical (PROV-4/5/6) ✅
 //! - Pallet Config trait canonical ✅
+//! - Runtime API canonical `verify_provenance` (PROV-8) ✅ v0.0.17
+//! - **Mock runtime + integration tests E2E own fixtures (v0.0.18 sesión 3+) ✅**
+//!
+//! ## v0.0.18 sesión 3+ mock runtime integration tests
+//!
+//! Per audit canonical sesión 3+ (`AUDIT_CHARON_SESION_3_STATE_V1.md`),
+//! Ergon E2E fixture diary claim aspirational sin shipped commit verified.
+//! Charon construye own fixtures basados en vendor copy ValidationAttestation
+//! real existente. 9 integration tests canonical:
+//!
+//! - 5 scenarios PROV-3 flow: passed_info anchored + warning anchored +
+//!   failed_critical rejected + passed_block_security rejected + anonymous_level_0 rejected
+//! - 4 additional: idempotency + tampered_signature + tampered_payload + 6-step walkthrough
+//!
+//! Mock runtime composition canonical via `construct_runtime!` macro (System + Provenance).
 //!
 //! ## Lo que NO funciona aún (post-Ergon sub-crate Cap 42+)
 //!
@@ -287,6 +302,16 @@ pub mod pallet {
 
 extern crate alloc;
 
+// v0.0.18 — Mock runtime canonical + integration tests E2E PROV-3 flow.
+// Per audit canonical sesión 3+ (`AUDIT_CHARON_SESION_3_STATE_V1.md`),
+// own fixtures basados en vendor copy ValidationAttestation real existente
+// (no depender de Ergon E2E fixture diary claim aspirational).
+#[cfg(test)]
+pub mod mock;
+
+#[cfg(test)]
+mod tests_integration;
+
 #[cfg(test)]
 mod tests {
     use super::*;