Implement embedded Orleans localhost host

AGENTS.md

@@ -23,6 +23,7 @@ This file defines how AI agents work in this solution.
   - `DotPilot`
   - `DotPilot.Core`
   - `DotPilot.Runtime`
+  - `DotPilot.Runtime.Host`
   - `DotPilot.ReleaseTool`
   - `DotPilot.Tests`
   - `DotPilot.UITests`
@@ -152,6 +153,7 @@ For this app:
 - architecture work must keep a vertical-slice shape: each feature owns its contracts, orchestration, and tests behind clear boundaries instead of growing a shared horizontal service layer
 - keep the Uno app project presentation-only; domain, runtime host, orchestration, integrations, and persistence code must live in separate class-library projects so UI composition does not mix with feature implementation
 - structure both `DotPilot.Tests` and `DotPilot.UITests` by vertical slice and explicit harness boundaries; do not keep test files in one flat project-root pile
+- the first embedded Orleans host cut must use `UseLocalhostClustering` plus in-memory grain storage and reminders; do not introduce remote clustering or external durable stores until a later backlog item explicitly requires them
 - GitHub is the backlog, not the product: use issues and PRs only to drive task scope and traceability, and never copy GitHub issue text, labels, workflow language, or tracker metadata into production code, runtime snapshots, or user-facing UI
 - Desktop responsiveness is a product requirement: avoid synchronous probe, filesystem, network, or process work on UI-facing construction and navigation paths so the app stays fast and immediately reactive
 - Do not invent a repo-specific product framing such as "workbench" unless the active issue or feature spec explicitly uses it; implement the app features described in the backlog instead of turning internal implementation language into the product narrative

Directory.Packages.props

@@ -12,6 +12,10 @@
     <PackageVersion Include="coverlet.collector" Version="8.0.0" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageVersion Include="Microsoft.Orleans.Core.Abstractions" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.Orleans.Persistence.Memory" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.Orleans.Reminders" Version="10.0.1" />
+    <PackageVersion Include="Microsoft.Orleans.Server" Version="10.0.1" />
     <PackageVersion Include="NUnit" Version="4.5.1" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="3.0.1" />

DotPilot.Core/DotPilot.Core.csproj

@@ -6,4 +6,8 @@
         <NoWarn>$(NoWarn);CS1591</NoWarn>
     </PropertyGroup>
 
+    <ItemGroup>
+        <PackageReference Include="Microsoft.Orleans.Core.Abstractions" />
+    </ItemGroup>
+
 </Project>

DotPilot.Core/Features/ControlPlaneDomain/ControlPlaneIdentifiers.cs

@@ -2,77 +2,96 @@
 
 namespace DotPilot.Core.Features.ControlPlaneDomain;
 
-public readonly record struct WorkspaceId(Guid Value)
+[GenerateSerializer]
+public readonly record struct WorkspaceId([property: Id(0)] Guid Value)
 {
     public static WorkspaceId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct AgentProfileId(Guid Value)
+[GenerateSerializer]
+public readonly record struct AgentProfileId([property: Id(0)] Guid Value)
 {
     public static AgentProfileId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct SessionId(Guid Value)
+[GenerateSerializer]
+public readonly record struct SessionId([property: Id(0)] Guid Value)
 {
     public static SessionId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct FleetId(Guid Value)
+[GenerateSerializer]
+public readonly record struct FleetId([property: Id(0)] Guid Value)
 {
     public static FleetId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct ProviderId(Guid Value)
+[GenerateSerializer]
+public readonly record struct PolicyId([property: Id(0)] Guid Value)
+{
+    public static PolicyId New() => new(ControlPlaneIdentifier.NewValue());
+
+    public override string ToString() => ControlPlaneIdentifier.Format(Value);
+}
+
+[GenerateSerializer]
+public readonly record struct ProviderId([property: Id(0)] Guid Value)
 {
     public static ProviderId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct ModelRuntimeId(Guid Value)
+[GenerateSerializer]
+public readonly record struct ModelRuntimeId([property: Id(0)] Guid Value)
 {
     public static ModelRuntimeId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct ToolCapabilityId(Guid Value)
+[GenerateSerializer]
+public readonly record struct ToolCapabilityId([property: Id(0)] Guid Value)
 {
     public static ToolCapabilityId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct ApprovalId(Guid Value)
+[GenerateSerializer]
+public readonly record struct ApprovalId([property: Id(0)] Guid Value)
 {
     public static ApprovalId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct ArtifactId(Guid Value)
+[GenerateSerializer]
+public readonly record struct ArtifactId([property: Id(0)] Guid Value)
 {
     public static ArtifactId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct TelemetryRecordId(Guid Value)
+[GenerateSerializer]
+public readonly record struct TelemetryRecordId([property: Id(0)] Guid Value)
 {
     public static TelemetryRecordId New() => new(ControlPlaneIdentifier.NewValue());
 
     public override string ToString() => ControlPlaneIdentifier.Format(Value);
 }
 
-public readonly record struct EvaluationId(Guid Value)
+[GenerateSerializer]
+public readonly record struct EvaluationId([property: Id(0)] Guid Value)
 {
     public static EvaluationId New() => new(ControlPlaneIdentifier.NewValue());
 

DotPilot.Core/Features/ControlPlaneDomain/ParticipantContracts.cs

@@ -1,40 +1,58 @@
 namespace DotPilot.Core.Features.ControlPlaneDomain;
 
+[GenerateSerializer]
 public sealed record WorkspaceDescriptor
 {
+    [Id(0)]
     public WorkspaceId Id { get; init; }
 
+    [Id(1)]
     public string Name { get; init; } = string.Empty;
 
+    [Id(2)]
     public string RootPath { get; init; } = string.Empty;
 
+    [Id(3)]
     public string BranchName { get; init; } = string.Empty;
 }
 
+[GenerateSerializer]
 public sealed record AgentProfileDescriptor
 {
+    [Id(0)]
     public AgentProfileId Id { get; init; }
 
+    [Id(1)]
     public string Name { get; init; } = string.Empty;
 
+    [Id(2)]
     public AgentRoleKind Role { get; init; }
 
+    [Id(3)]
     public ProviderId? ProviderId { get; init; }
 
+    [Id(4)]
     public ModelRuntimeId? ModelRuntimeId { get; init; }
 
-    public IReadOnlyList<ToolCapabilityId> ToolCapabilityIds { get; init; } = [];
+    [Id(5)]
+    public ToolCapabilityId[] ToolCapabilityIds { get; init; } = [];
 
-    public IReadOnlyList<string> Tags { get; init; } = [];
+    [Id(6)]
+    public string[] Tags { get; init; } = [];
 }
 
+[GenerateSerializer]
 public sealed record FleetDescriptor
 {
+    [Id(0)]
     public FleetId Id { get; init; }
 
+    [Id(1)]
     public string Name { get; init; } = string.Empty;
 
+    [Id(2)]
     public FleetExecutionMode ExecutionMode { get; init; } = FleetExecutionMode.SingleAgent;
 
-    public IReadOnlyList<AgentProfileId> AgentProfileIds { get; init; } = [];
+    [Id(3)]
+    public AgentProfileId[] AgentProfileIds { get; init; } = [];
 }

DotPilot.Core/Features/ControlPlaneDomain/PolicyContracts.cs

@@ -0,0 +1,23 @@
+namespace DotPilot.Core.Features.ControlPlaneDomain;
+
+[GenerateSerializer]
+public sealed record PolicyDescriptor
+{
+    [Id(0)]
+    public PolicyId Id { get; init; }
+
+    [Id(1)]
+    public string Name { get; init; } = string.Empty;
+
+    [Id(2)]
+    public ApprovalState DefaultApprovalState { get; init; } = ApprovalState.NotRequired;
+
+    [Id(3)]
+    public bool AllowsNetworkAccess { get; init; }
+
+    [Id(4)]
+    public bool AllowsFileSystemWrites { get; init; }
+
+    [Id(5)]
+    public ApprovalScope[] ProtectedScopes { get; init; } = [];
+}

DotPilot.Core/Features/ControlPlaneDomain/ProviderAndToolContracts.cs

@@ -1,50 +1,73 @@
 namespace DotPilot.Core.Features.ControlPlaneDomain;
 
+[GenerateSerializer]
 public sealed record ToolCapabilityDescriptor
 {
+    [Id(0)]
     public ToolCapabilityId Id { get; init; }
 
+    [Id(1)]
     public string Name { get; init; } = string.Empty;
 
+    [Id(2)]
     public string DisplayName { get; init; } = string.Empty;
 
+    [Id(3)]
     public ToolCapabilityKind Kind { get; init; }
 
+    [Id(4)]
     public bool RequiresApproval { get; init; }
 
+    [Id(5)]
     public bool IsEnabledByDefault { get; init; }
 
-    public IReadOnlyList<string> Tags { get; init; } = [];
+    [Id(6)]
+    public string[] Tags { get; init; } = [];
 }
 
+[GenerateSerializer]
 public sealed record ProviderDescriptor
 {
+    [Id(0)]
     public ProviderId Id { get; init; }
 
+    [Id(1)]
     public string DisplayName { get; init; } = string.Empty;
 
+    [Id(2)]
     public string CommandName { get; init; } = string.Empty;
 
+    [Id(3)]
     public ProviderConnectionStatus Status { get; init; } = ProviderConnectionStatus.Unavailable;
 
+    [Id(4)]
     public string StatusSummary { get; init; } = string.Empty;
 
+    [Id(5)]
     public bool RequiresExternalToolchain { get; init; }
 
-    public IReadOnlyList<ToolCapabilityId> SupportedToolIds { get; init; } = [];
+    [Id(6)]
+    public ToolCapabilityId[] SupportedToolIds { get; init; } = [];
 }
 
+[GenerateSerializer]
 public sealed record ModelRuntimeDescriptor
 {
+    [Id(0)]
     public ModelRuntimeId Id { get; init; }
 
+    [Id(1)]
     public string DisplayName { get; init; } = string.Empty;
 
+    [Id(2)]
     public string EngineName { get; init; } = string.Empty;
 
+    [Id(3)]
     public RuntimeKind RuntimeKind { get; init; }
 
+    [Id(4)]
     public ProviderConnectionStatus Status { get; init; } = ProviderConnectionStatus.Unavailable;
 
-    public IReadOnlyList<string> SupportedModelFamilies { get; init; } = [];
+    [Id(5)]
+    public string[] SupportedModelFamilies { get; init; } = [];
 }