feat: add secret store foundation

crates/crank-core/src/lib.rs

@@ -5,6 +5,7 @@ pub mod ids;
 pub mod observability;
 pub mod operation;
 pub mod protocol;
+pub mod secret;
 pub mod workspace;
 
 pub use access::{
@@ -18,7 +19,7 @@ pub use auth::{
 };
 pub use ids::{
     AgentId, AuthProfileId, DescriptorId, InvitationId, InvocationLogId, OperationId,
-    PlatformApiKeyId, SampleId, ToolId, UserId, UserSessionId, WorkspaceId,
+    PlatformApiKeyId, SampleId, SecretId, ToolId, UserId, UserSessionId, WorkspaceId,
 };
 pub use observability::{
     InvocationLevel, InvocationLog, InvocationSource, InvocationStatus, UsagePeriod, UsageRollup,
@@ -29,4 +30,5 @@ pub use operation::{
     RetryPolicy, Samples, Target, ToolDescription, ToolExample,
 };
 pub use protocol::{AuthKind, ExportMode, GraphqlOperationType, HttpMethod, Protocol};
+pub use secret::{Secret, SecretKind, SecretStatus, SecretVersion};
 pub use workspace::{Workspace, WorkspaceStatus};