diff --git a/contracts/configuration/primitives.go b/contracts/configuration/primitives.go
new file mode 100644
index 0000000..e1809b4
--- /dev/null
+++ b/contracts/configuration/primitives.go
@@ -0,0 +1,7 @@
+package configuration
+
+import "git.cin.su/m/Assistant/platform/ids"
+
+// SemanticReference is a typed cross-owner reference; settings remain
+// Configuration-owned records.
+type SemanticReference = ids.SemanticRef
diff --git a/contracts/epistemics/primitives.go b/contracts/epistemics/primitives.go
new file mode 100644
index 0000000..097038e
--- /dev/null
+++ b/contracts/epistemics/primitives.go
@@ -0,0 +1,7 @@
+package epistemics
+
+import "git.cin.su/m/Assistant/platform/ids"
+
+// SemanticReference identifies evidence-related records without transferring
+// canonical ownership to Epistemics.
+type SemanticReference = ids.SemanticRef
diff --git a/contracts/self/primitives.go b/contracts/self/primitives.go
new file mode 100644
index 0000000..c4c1d58
--- /dev/null
+++ b/contracts/self/primitives.go
@@ -0,0 +1,7 @@
+package self
+
+import "git.cin.su/m/Assistant/platform/ids"
+
+// SemanticReference lets SELF cite evidence and capabilities without owning
+// their canonical state.
+type SemanticReference = ids.SemanticRef
diff --git a/contracts/situation/primitives.go b/contracts/situation/primitives.go
new file mode 100644
index 0000000..8885258
--- /dev/null
+++ b/contracts/situation/primitives.go
@@ -0,0 +1,7 @@
+package situation
+
+import "git.cin.su/m/Assistant/platform/ids"
+
+// SemanticReference keeps Situation references transport-neutral while
+// ContextScope semantics remain owned by Situation.
+type SemanticReference = ids.SemanticRef
diff --git a/contracts/world/primitives.go b/contracts/world/primitives.go
new file mode 100644
index 0000000..3d52c26
--- /dev/null
+++ b/contracts/world/primitives.go
@@ -0,0 +1,97 @@
+package world
+
+import (
+	"fmt"
+
+	"git.cin.su/m/Assistant/platform/ids"
+)
+
+// SemanticReference is the transport envelope used by World contracts. It is
+// a reference only; it does not expose another owner's storage.
+type SemanticReference = ids.SemanticRef
+
+type PrincipalRealm string
+
+const (
+	RealmPersonal PrincipalRealm = "PERSONAL"
+	RealmShared   PrincipalRealm = "SHARED"
+	RealmPublic   PrincipalRealm = "PUBLIC"
+	RealmSystem   PrincipalRealm = "SYSTEM"
+)
+
+type SensitivityClass string
+
+const (
+	SensitivityPublic          SensitivityClass = "PUBLIC"
+	SensitivityPrivate         SensitivityClass = "PRIVATE"
+	SensitivityRestricted      SensitivityClass = "RESTRICTED"
+	SensitivitySecretReference SensitivityClass = "SECRET_REFERENCE"
+)
+
+type ValueTypeKind string
+
+const (
+	ValueString    ValueTypeKind = "STRING"
+	ValueInteger   ValueTypeKind = "INTEGER"
+	ValueDecimal   ValueTypeKind = "DECIMAL"
+	ValueBoolean   ValueTypeKind = "BOOLEAN"
+	ValueTime      ValueTypeKind = "TIME"
+	ValueDuration  ValueTypeKind = "DURATION"
+	ValueEnum      ValueTypeKind = "ENUM"
+	ValueReference ValueTypeKind = "REFERENCE"
+	ValueBinaryRef ValueTypeKind = "BINARY_REF"
+	ValueList      ValueTypeKind = "LIST"
+	ValueStruct    ValueTypeKind = "STRUCT"
+)
+
+type ValueField struct {
+	Name string
+	Type ValueTypeSpec
+}
+
+type ValueTypeSpec struct {
+	Kind          ValueTypeKind
+	Element       *ValueTypeSpec
+	Fields        []ValueField
+	EnumValues    []string
+	ReferenceKind string
+}
+
+func (s ValueTypeSpec) Validate() error {
+	if s.Kind == "" {
+		return fmt.Errorf("value type kind is required")
+	}
+	switch s.Kind {
+	case ValueList:
+		if s.Element == nil {
+			return fmt.Errorf("list element type is required")
+		}
+		return s.Element.Validate()
+	case ValueStruct:
+		if len(s.Fields) == 0 {
+			return fmt.Errorf("struct fields are required")
+		}
+		seen := map[string]struct{}{}
+		for _, field := range s.Fields {
+			if field.Name == "" {
+				return fmt.Errorf("struct field name is required")
+			}
+			if _, ok := seen[field.Name]; ok {
+				return fmt.Errorf("duplicate struct field %q", field.Name)
+			}
+			seen[field.Name] = struct{}{}
+			if err := field.Type.Validate(); err != nil {
+				return fmt.Errorf("field %s: %w", field.Name, err)
+			}
+		}
+	case ValueEnum:
+		if len(s.EnumValues) == 0 {
+			return fmt.Errorf("enum values are required")
+		}
+	case ValueReference:
+		if s.ReferenceKind == "" {
+			return fmt.Errorf("reference kind is required")
+		}
+	}
+	return nil
+}
diff --git a/contracts/world/primitives_test.go b/contracts/world/primitives_test.go
new file mode 100644
index 0000000..278eef1
--- /dev/null
+++ b/contracts/world/primitives_test.go
@@ -0,0 +1,17 @@
+package world
+
+import "testing"
+
+func TestValueTypeSpecValidatesTypedRecursiveShape(t *testing.T) {
+	spec := ValueTypeSpec{Kind: ValueStruct, Fields: []ValueField{{Name: "name", Type: ValueTypeSpec{Kind: ValueString}}, {Name: "refs", Type: ValueTypeSpec{Kind: ValueList, Element: &ValueTypeSpec{Kind: ValueReference, ReferenceKind: "world.object"}}}}}
+	if err := spec.Validate(); err != nil {
+		t.Fatalf("ValueTypeSpec.Validate() = %v", err)
+	}
+}
+
+func TestValueTypeSpecRejectsDuplicateFields(t *testing.T) {
+	spec := ValueTypeSpec{Kind: ValueStruct, Fields: []ValueField{{Name: "same", Type: ValueTypeSpec{Kind: ValueString}}, {Name: "same", Type: ValueTypeSpec{Kind: ValueString}}}}
+	if err := spec.Validate(); err == nil {
+		t.Fatal("duplicate fields were accepted")
+	}
+}
diff --git a/dev/ACTIVE_TASK.json b/dev/ACTIVE_TASK.json
index 74b8ef7..872a17e 100644
--- a/dev/ACTIVE_TASK.json
+++ b/dev/ACTIVE_TASK.json
@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/GEN2-001-accept-gen2-owner-registry-and-dependency-rules.json",
-  "task_id": "GEN2-001",
+  "task_file": "dev/tasks/GEN2-002-introduce-shared-gen2-data-primitives-without-shared-domain-semantics.json",
+  "task_id": "GEN2-002",
   "task_revision": 1
 }
diff --git a/platform/clock/instant.go b/platform/clock/instant.go
new file mode 100644
index 0000000..7db8330
--- /dev/null
+++ b/platform/clock/instant.go
@@ -0,0 +1,14 @@
+package clock
+
+import "time"
+
+// Instant is a UTC point represented as Unix milliseconds.
+type Instant int64
+
+func (i Instant) Valid() bool { return i > 0 }
+
+func NowInstant() Instant { return FromTime(time.Now().UTC()) }
+
+func FromTime(value time.Time) Instant { return Instant(value.UTC().UnixMilli()) }
+
+func (i Instant) Time() time.Time { return time.UnixMilli(int64(i)).UTC() }
diff --git a/platform/clock/instant_test.go b/platform/clock/instant_test.go
new file mode 100644
index 0000000..74a83d8
--- /dev/null
+++ b/platform/clock/instant_test.go
@@ -0,0 +1,14 @@
+package clock
+
+import (
+	"testing"
+	"time"
+)
+
+func TestInstantRoundTripUsesUTCUnixMilliseconds(t *testing.T) {
+	want := time.Date(2026, time.August, 29, 12, 34, 56, 789000000, time.FixedZone("local", 3*60*60))
+	got := FromTime(want).Time()
+	if !got.Equal(want.UTC()) || got.Location() != time.UTC {
+		t.Fatalf("instant round trip = %v, want %v UTC", got, want.UTC())
+	}
+}
diff --git a/platform/ids/ids.go b/platform/ids/ids.go
index d4391ff..8389550 100644
--- a/platform/ids/ids.go
+++ b/platform/ids/ids.go
@@ -6,14 +6,43 @@ import (
 	"fmt"
 )
 
-// ID is a transport-neutral opaque identifier primitive. Domain packages wrap it
-// in strong semantic ID types; do not pass bare ID across semantic boundaries.
-type ID string
+// StableID is a transport-neutral opaque identifier primitive. Domain packages
+// wrap it in strong semantic ID types; do not pass bare StableID across
+// semantic boundaries.
+type StableID string
 
-func New() (ID, error) {
+// ID is retained as a compatibility name for the V1 primitive.
+type ID = StableID
+
+// Revision is the optimistic version of a versioned semantic record.
+type Revision uint64
+
+const InitialRevision Revision = 1
+
+func (r Revision) Valid() bool { return r >= InitialRevision }
+
+// SemanticRef is a technical cross-owner reference envelope. It identifies a
+// record but does not grant storage ownership or provide generic CRUD.
+type SemanticRef struct {
+	OwnerNamespace string
+	SemanticKind   string
+	StableID       StableID
+	Revision       *Revision
+}
+
+func (r SemanticRef) Valid() bool {
+	return r.OwnerNamespace != "" && r.SemanticKind != "" && r.StableID != "" &&
+		(r.Revision == nil || r.Revision.Valid())
+}
+
+func NewStableID() (StableID, error) {
 	var b [16]byte
 	if _, err := rand.Read(b[:]); err != nil {
 		return "", fmt.Errorf("generate id: %w", err)
 	}
-	return ID(hex.EncodeToString(b[:])), nil
+	return StableID(hex.EncodeToString(b[:])), nil
+}
+
+func New() (ID, error) {
+	return NewStableID()
 }
diff --git a/platform/ids/ids_test.go b/platform/ids/ids_test.go
new file mode 100644
index 0000000..da59f15
--- /dev/null
+++ b/platform/ids/ids_test.go
@@ -0,0 +1,21 @@
+package ids
+
+import "testing"
+
+func TestNewStableIDIsOpaque128BitHex(t *testing.T) {
+	id, err := NewStableID()
+	if err != nil || len(id) != 32 {
+		t.Fatalf("NewStableID() = %q, %v", id, err)
+	}
+	if !(SemanticRef{OwnerNamespace: "world", SemanticKind: "object", StableID: id}.Valid()) {
+		t.Fatal("stable id was not accepted by semantic reference")
+	}
+}
+
+func TestSemanticRefRejectsInvalidRevision(t *testing.T) {
+	revision := Revision(0)
+	ref := SemanticRef{OwnerNamespace: "world", SemanticKind: "object", StableID: "id", Revision: &revision}
+	if ref.Valid() {
+		t.Fatal("semantic reference accepted invalid revision")
+	}
+}