feat(OMN-13407): carry delegation context pack hash

src/omnibase_core/models/delegation/wire/model_delegation_wire_request.py

@@ -96,6 +96,20 @@ class ModelDelegationRequest(BaseModel):
         default=None,
         description="File context for the delegation, if any.",
     )
+    context_pack: str = Field(
+        default="",
+        description=(
+            "Optional assembled context injected ahead of the prompt for context "
+            "ON/OFF experiments. Empty string means no context pack."
+        ),
+    )
+    context_pack_hash: str = Field(
+        default="",
+        description=(
+            "Stable hash of context_pack for projection readback and ROI "
+            "measurement. Empty string means no context pack was injected."
+        ),
+    )
     correlation_id: UUID = Field(
         ...,
         description="Unique identifier for tracking through the pipeline.",

src/omnibase_core/models/delegation/wire/model_task_delegated_event.py

@@ -89,6 +89,13 @@ class ModelTaskDelegatedEvent(BaseModel):
         default=None,
         description="Raw response received from the delegated model.",
     )
+    context_pack_hash: str = Field(
+        default="",
+        description=(
+            "Stable hash of the context pack injected into the delegated prompt. "
+            "Empty string means the OFF arm or no context pack."
+        ),
+    )
     pricing_manifest_version: int = Field(
         default=0,
         ge=0,

tests/unit/models/delegation/wire/test_delegation_wire_models.py

@@ -75,6 +75,19 @@ def test_basic_construction(self) -> None:
         r = self._make()
         assert r.task_type == "test"
 
+    def test_context_pack_hash_defaults_to_off_arm(self) -> None:
+        r = self._make()
+        assert r.context_pack == ""
+        assert r.context_pack_hash == ""
+
+    def test_context_pack_hash_is_accepted(self) -> None:
+        r = self._make(
+            context_pack="Relevant repo facts.",
+            context_pack_hash="sha256:abc123",
+        )
+        assert r.context_pack == "Relevant repo facts."
+        assert r.context_pack_hash == "sha256:abc123"
+
     def test_compliance_budget_required_when_schema_key_set(self) -> None:
         with pytest.raises(ValueError, match="compliance_budget is required"):
             self._make(output_schema_key="some_schema")
@@ -607,6 +620,18 @@ def test_default_topic(self) -> None:
         )
         assert event.topic == TASK_DELEGATED_TOPIC_V1
         assert event.escalation_count == 0
+        assert event.context_pack_hash == ""
+
+    def test_carries_context_pack_hash(self) -> None:
+        event = ModelTaskDelegatedEvent(
+            timestamp="2026-05-26T00:00:00Z",
+            correlation_id=uuid.uuid4(),
+            task_type="test",
+            delegated_to="local_qwen3",
+            quality_gate_passed=True,
+            context_pack_hash="sha256:ctx",
+        )
+        assert event.context_pack_hash == "sha256:ctx"
 
     def test_rejects_invalid_topic_and_negative_metrics(self) -> None:
         with pytest.raises(ValidationError):