refactor(agent): align policy contracts with runtime (#6306)

app/agent/policy/__init__.py

@@ -4,14 +4,9 @@ from app.agent.policy.contracts import (
     ActionEffect,
     ActionPolicy,
     AuthSource,
-    CanonicalInvocation,
-    ConversationKind,
-    DeliveryTarget,
     ConfirmationMode,
     ExecutionOutcome,
     ExecutionReceipt,
-    InboundEnvelope,
-    InboundProvenance,
     MigrationState,
     PolicyDecision,
     PolicyObservation,
@@ -19,10 +14,7 @@ from app.agent.policy.contracts import (
     PrincipalRole,
     PrincipalType,
     RecoveryMode,
-    RECEIPT_STATE_TRANSITIONS,
-    ReceiptState,
     ResultSensitivity,
-    TERMINAL_RECEIPT_STATES,
     ToolInvocation,
     ToolOrigin,
     ToolPolicyContext,
@@ -48,16 +40,11 @@ __all__ = [
     "ActionPolicy",
     "AgentToolPolicyOrchestrator",
     "AuthSource",
-    "CanonicalInvocation",
-    "ConversationKind",
-    "DeliveryTarget",
     "ConfirmationMode",
     "DEFAULT_TOOL_POLICY_ORCHESTRATOR",
     "DEFAULT_TOOL_POLICY_REGISTRY",
     "ExecutionOutcome",
     "ExecutionReceipt",
-    "InboundEnvelope",
-    "InboundProvenance",
     "MigrationState",
     "PolicyDecision",
     "PolicyObservation",
@@ -66,10 +53,7 @@ __all__ = [
     "PrincipalType",
     "REDACTED_VALUE",
     "RecoveryMode",
-    "RECEIPT_STATE_TRANSITIONS",
-    "ReceiptState",
     "ResultSensitivity",
-    "TERMINAL_RECEIPT_STATES",
     "ToolInvocation",
     "ToolOrigin",
     "ToolPolicyContext",