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+# Insin Integration Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Ship the Epson print service as an Insin `.pkg` and emit runtime telemetry (events) to the on-device Insin agent's loopback listener.
+
+**Architecture:** New `Inspectron.Epson.PrintServer.Telemetry` namespace holds a small `IInsinTelemetry` interface (`Emit(kind, message)`) with two implementations (loopback HTTP; null). Event firing is wired at four points: bootstrap end (`service.started`), print outcome in `PrinterQueue` (`job.printed`, `job.failed.<reason>`), and a decorator around the discovery receiver (`printer.discovered`, `printer.online`, `printer.offline`). Package delivery is a plain zip with two shell hooks (`postinst`, `prem`) that install/remove the systemd units; publish is a hand-run script (no CI). See `docs/superpowers/specs/2026-07-23-insin-integration-design.md` for background.
+
+**Tech Stack:** C# / .NET 8, xUnit, Ninject, systemd, bash, `insin` CLI.
+
+---
+
+## File Structure
+
+**New source files:**
+- `Inspectron.Epson/PrintServer/Telemetry/IInsinTelemetry.cs` — interface, one method `void Emit(string kind, string message)`.
+- `Inspectron.Epson/PrintServer/Telemetry/NullInsinTelemetry.cs` — no-op implementation (for emulation mode).
+- `Inspectron.Epson/PrintServer/Telemetry/LoopbackInsinTelemetry.cs` — POSTs to `http://127.0.0.1:47823/events`, fire-and-forget, rate-limited warn log on failure.
+- `Inspectron.Epson/PrintServer/Telemetry/InsinMessageFormatter.cs` — pure static helper: builds `key=value key=value` strings, quotes values containing spaces.
+- `Inspectron.Epson/PrintServer/Telemetry/InsinEventKinds.cs` — constants for all kind strings and `MapErrorTypeToKindSuffix(PrintErrorType)`.
+- `Inspectron.Epson/PrintServer/DiscoveredPrintersReceiver/InsinTelemetryDiscoveredPrintersReceiver.cs` — decorator that wraps an inner `IDiscoveredPrintersReceiver` and emits transition events.
+
+**New test files (in a new `Inspectron.Epson.Tests` xUnit project):**
+- `Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj`
+- `Inspectron.Epson.Tests/GlobalUsings.cs`
+- `Inspectron.Epson.Tests/Telemetry/InsinMessageFormatterTests.cs`
+- `Inspectron.Epson.Tests/Telemetry/InsinEventKindsTests.cs`
+- `Inspectron.Epson.Tests/Telemetry/NullInsinTelemetryTests.cs`
+- `Inspectron.Epson.Tests/Telemetry/LoopbackInsinTelemetryTests.cs`
+- `Inspectron.Epson.Tests/Telemetry/InsinTelemetryDiscoveredPrintersReceiverTests.cs`
+- `Inspectron.Epson.Tests/Configuration/ConfigurationPathsTests.cs`
+
+**Modified source files:**
+- `Inspectron.Epson/Queue/PrinterQueue.cs` — add `IInsinTelemetry` dependency, emit `job.printed` / `job.failed.*`.
+- `Inspectron.Epson/Queue/PrintServer.cs` — thread `IInsinTelemetry` through to `PrinterQueue`.
+- `EpsonPrintService/PrintServerBootstrapper.cs` — DI binding, decorator wrapping, `service.started` emit.
+- `EpsonPrintService/ConfigurationPaths.cs` — change `LinuxConfigDir` from `/root/epsonprintservice` to `/opt/epson-print-service`.
+- `EpsonPrintService/EpsonPrintService.csproj` — bump `<Version>` (done per publish).
+- `Inspectron.Epson.slnx` — add the new test project.
+
+**New package assets (git-tracked):**
+- `deploy/insin/install.cfg`
+- `deploy/insin/postinst`
+- `deploy/insin/prem`
+- `deploy/insin/epson.service`
+- `deploy/insin/print_server.service`
+
+**New scripts (git-tracked):**
+- `scripts/publish-insin.sh`
+
+**Modified misc:**
+- `.gitignore` — add `.tools/` and `publish/`.
+
+---
+
+## Task 1: Bootstrap the `Inspectron.Epson.Tests` xUnit project
+
+**Files:**
+- Create: `Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj`
+- Create: `Inspectron.Epson.Tests/GlobalUsings.cs`
+- Create: `Inspectron.Epson.Tests/Sanity/SanityTests.cs`
+- Modify: `Inspectron.Epson.slnx`
+
+- [ ] **Step 1: Create the csproj**
+
+Write `Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj`:
+
+```xml
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <RollForward>Major</RollForward>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Inspectron.Epson\Inspectron.Epson.csproj" />
+    <ProjectReference Include="..\EpsonPrintService\EpsonPrintService.csproj" />
+  </ItemGroup>
+
+</Project>
+```
+
+- [ ] **Step 2: Create GlobalUsings.cs**
+
+Write `Inspectron.Epson.Tests/GlobalUsings.cs`:
+
+```csharp
+global using Xunit;
+```
+
+- [ ] **Step 3: Add a sanity test**
+
+Write `Inspectron.Epson.Tests/Sanity/SanityTests.cs`:
+
+```csharp
+namespace Inspectron.Epson.Tests.Sanity;
+
+public class SanityTests
+{
+    [Fact]
+    public void Truth_is_true() => Assert.True(true);
+}
+```
+
+- [ ] **Step 4: Add the project to the solution**
+
+Edit `Inspectron.Epson.slnx`; add a `<Project>` line after the existing test project reference:
+
+```xml
+<Project Path="Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj" />
+```
+
+- [ ] **Step 5: Run the tests**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj`
+Expected: `Passed! - Failed: 0, Passed: 1`.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add Inspectron.Epson.Tests/ Inspectron.Epson.slnx
+git commit -m "add Inspectron.Epson.Tests xUnit project"
+```
+
+---
+
+## Task 2: `InsinMessageFormatter` — pure key=value builder
+
+**Files:**
+- Create: `Inspectron.Epson/PrintServer/Telemetry/InsinMessageFormatter.cs`
+- Create: `Inspectron.Epson.Tests/Telemetry/InsinMessageFormatterTests.cs`
+
+- [ ] **Step 1: Write the failing tests**
+
+Write `Inspectron.Epson.Tests/Telemetry/InsinMessageFormatterTests.cs`:
+
+```csharp
+using Inspectron.Epson.PrintServer.Telemetry;
+
+namespace Inspectron.Epson.Tests.Telemetry;
+
+public class InsinMessageFormatterTests
+{
+    [Fact]
+    public void Format_single_pair_no_spaces()
+    {
+        var result = InsinMessageFormatter.Format(("printer", "192.168.1.10"));
+        Assert.Equal("printer=192.168.1.10", result);
+    }
+
+    [Fact]
+    public void Format_multiple_pairs_joined_by_space()
+    {
+        var result = InsinMessageFormatter.Format(
+            ("printer", "192.168.1.10"),
+            ("jobId", "42"));
+        Assert.Equal("printer=192.168.1.10 jobId=42", result);
+    }
+
+    [Fact]
+    public void Format_quotes_value_containing_space()
+    {
+        var result = InsinMessageFormatter.Format(("error", "paper end detected"));
+        Assert.Equal("error=\"paper end detected\"", result);
+    }
+
+    [Fact]
+    public void Format_escapes_embedded_double_quote()
+    {
+        var result = InsinMessageFormatter.Format(("error", "he said \"nope\""));
+        Assert.Equal("error=\"he said \\\"nope\\\"\"", result);
+    }
+
+    [Fact]
+    public void Format_treats_null_or_empty_value_as_empty_string()
+    {
+        var result = InsinMessageFormatter.Format(("model", (string?)null), ("name", ""));
+        Assert.Equal("model= name=", result);
+    }
+
+    [Fact]
+    public void Format_omits_pairs_with_null_or_empty_key()
+    {
+        var result = InsinMessageFormatter.Format(
+            ("", "ignored"),
+            ("printer", "192.168.1.10"));
+        Assert.Equal("printer=192.168.1.10", result);
+    }
+}
+```
+
+- [ ] **Step 2: Verify the tests fail**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~InsinMessageFormatter`
+Expected: build error — `InsinMessageFormatter` does not exist.
+
+- [ ] **Step 3: Implement**
+
+Write `Inspectron.Epson/PrintServer/Telemetry/InsinMessageFormatter.cs`:
+
+```csharp
+using System.Text;
+
+namespace Inspectron.Epson.PrintServer.Telemetry;
+
+public static class InsinMessageFormatter
+{
+    public static string Format(params (string Key, string? Value)[] pairs)
+    {
+        var sb = new StringBuilder();
+        foreach (var (key, value) in pairs)
+        {
+            if (string.IsNullOrEmpty(key)) continue;
+            if (sb.Length > 0) sb.Append(' ');
+            sb.Append(key).Append('=').Append(FormatValue(value));
+        }
+        return sb.ToString();
+    }
+
+    private static string FormatValue(string? value)
+    {
+        if (string.IsNullOrEmpty(value)) return string.Empty;
+        if (value.IndexOf(' ') < 0 && value.IndexOf('"') < 0) return value;
+        var escaped = value.Replace("\\", "\\\\").Replace("\"", "\\\"");
+        return $"\"{escaped}\"";
+    }
+}
+```
+
+- [ ] **Step 4: Verify tests pass**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~InsinMessageFormatter`
+Expected: `Passed: 6, Failed: 0`.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add Inspectron.Epson/PrintServer/Telemetry/InsinMessageFormatter.cs \
+        Inspectron.Epson.Tests/Telemetry/InsinMessageFormatterTests.cs
+git commit -m "add InsinMessageFormatter"
+```
+
+---
+
+## Task 3: `IInsinTelemetry` + `NullInsinTelemetry`
+
+**Files:**
+- Create: `Inspectron.Epson/PrintServer/Telemetry/IInsinTelemetry.cs`
+- Create: `Inspectron.Epson/PrintServer/Telemetry/NullInsinTelemetry.cs`
+- Create: `Inspectron.Epson.Tests/Telemetry/NullInsinTelemetryTests.cs`
+
+- [ ] **Step 1: Write the failing test**
+
+Write `Inspectron.Epson.Tests/Telemetry/NullInsinTelemetryTests.cs`:
+
+```csharp
+using Inspectron.Epson.PrintServer.Telemetry;
+
+namespace Inspectron.Epson.Tests.Telemetry;
+
+public class NullInsinTelemetryTests
+{
+    [Fact]
+    public void Emit_does_nothing_and_does_not_throw()
+    {
+        var telemetry = new NullInsinTelemetry();
+        var ex = Record.Exception(() => telemetry.Emit("service.started", "version=1.0.0"));
+        Assert.Null(ex);
+    }
+}
+```
+
+- [ ] **Step 2: Verify the test fails**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~NullInsinTelemetry`
+Expected: build error — `IInsinTelemetry` and `NullInsinTelemetry` do not exist.
+
+- [ ] **Step 3: Implement the interface**
+
+Write `Inspectron.Epson/PrintServer/Telemetry/IInsinTelemetry.cs`:
+
+```csharp
+namespace Inspectron.Epson.PrintServer.Telemetry;
+
+public interface IInsinTelemetry
+{
+    void Emit(string kind, string message);
+}
+```
+
+- [ ] **Step 4: Implement the null adapter**
+
+Write `Inspectron.Epson/PrintServer/Telemetry/NullInsinTelemetry.cs`:
+
+```csharp
+namespace Inspectron.Epson.PrintServer.Telemetry;
+
+public sealed class NullInsinTelemetry : IInsinTelemetry
+{
+    public void Emit(string kind, string message) { }
+}
+```
+
+- [ ] **Step 5: Verify test passes**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~NullInsinTelemetry`
+Expected: `Passed: 1, Failed: 0`.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add Inspectron.Epson/PrintServer/Telemetry/IInsinTelemetry.cs \
+        Inspectron.Epson/PrintServer/Telemetry/NullInsinTelemetry.cs \
+        Inspectron.Epson.Tests/Telemetry/NullInsinTelemetryTests.cs
+git commit -m "add IInsinTelemetry and NullInsinTelemetry"
+```
+
+---
+
+## Task 4: `InsinEventKinds` — constants and error-type mapping
+
+**Files:**
+- Create: `Inspectron.Epson/PrintServer/Telemetry/InsinEventKinds.cs`
+- Create: `Inspectron.Epson.Tests/Telemetry/InsinEventKindsTests.cs`
+
+- [ ] **Step 1: Write the failing tests**
+
+Write `Inspectron.Epson.Tests/Telemetry/InsinEventKindsTests.cs`:
+
+```csharp
+using Inspectron.Epson.PrintServer.Telemetry;
+using Inspectron.Epson.Queue;
+
+namespace Inspectron.Epson.Tests.Telemetry;
+
+public class InsinEventKindsTests
+{
+    [Theory]
+    [InlineData(PrintErrorType.OutOfPaper, "job.failed.paper_out")]
+    [InlineData(PrintErrorType.Offline,    "job.failed.connection")]
+    [InlineData(PrintErrorType.ConversionError, "job.failed.other")]
+    [InlineData(PrintErrorType.Other,      "job.failed.other")]
+    [InlineData(PrintErrorType.None,       "job.failed.other")]
+    public void MapErrorTypeToKind(PrintErrorType input, string expected)
+    {
+        Assert.Equal(expected, InsinEventKinds.MapErrorTypeToKind(input));
+    }
+
+    [Fact]
+    public void Constants_have_expected_values()
+    {
+        Assert.Equal("service.started",     InsinEventKinds.ServiceStarted);
+        Assert.Equal("job.printed",         InsinEventKinds.JobPrinted);
+        Assert.Equal("printer.discovered",  InsinEventKinds.PrinterDiscovered);
+        Assert.Equal("printer.online",      InsinEventKinds.PrinterOnline);
+        Assert.Equal("printer.offline",     InsinEventKinds.PrinterOffline);
+    }
+}
+```
+
+Note: `PrintErrorType.CoverOpen` does not exist in the current enum (only `None`, `ConversionError`, `Offline`, `OutOfPaper`, `Other`) — the spec's `cover_open` suffix is deferred until the enum grows. `Offline` maps to `connection` because from the service's perspective a printer that stopped responding is a connection failure.
+
+- [ ] **Step 2: Verify the tests fail**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~InsinEventKinds`
+Expected: build error — `InsinEventKinds` does not exist.
+
+- [ ] **Step 3: Implement**
+
+Write `Inspectron.Epson/PrintServer/Telemetry/InsinEventKinds.cs`:
+
+```csharp
+using Inspectron.Epson.Queue;
+
+namespace Inspectron.Epson.PrintServer.Telemetry;
+
+public static class InsinEventKinds
+{
+    public const string ServiceStarted     = "service.started";
+    public const string JobPrinted         = "job.printed";
+    public const string PrinterDiscovered  = "printer.discovered";
+    public const string PrinterOnline      = "printer.online";
+    public const string PrinterOffline     = "printer.offline";
+
+    public static string MapErrorTypeToKind(PrintErrorType errorType) => errorType switch
+    {
+        PrintErrorType.OutOfPaper => "job.failed.paper_out",
+        PrintErrorType.Offline    => "job.failed.connection",
+        _                         => "job.failed.other",
+    };
+}
+```
+
+- [ ] **Step 4: Verify tests pass**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~InsinEventKinds`
+Expected: `Passed: 6, Failed: 0`.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add Inspectron.Epson/PrintServer/Telemetry/InsinEventKinds.cs \
+        Inspectron.Epson.Tests/Telemetry/InsinEventKindsTests.cs
+git commit -m "add InsinEventKinds and PrintErrorType mapping"
+```
+
+---
+
+## Task 5: `LoopbackInsinTelemetry` — HTTP loopback emitter
+
+**Files:**
+- Create: `Inspectron.Epson/PrintServer/Telemetry/LoopbackInsinTelemetry.cs`
+- Create: `Inspectron.Epson.Tests/Telemetry/LoopbackInsinTelemetryTests.cs`
+
+- [ ] **Step 1: Write the failing test — happy path**
+
+Write `Inspectron.Epson.Tests/Telemetry/LoopbackInsinTelemetryTests.cs`:
+
+```csharp
+using System.Net;
+using System.Text;
+using System.Text.Json;
+using Inspectron.Epson.PrintServer.Telemetry;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace Inspectron.Epson.Tests.Telemetry;
+
+public class LoopbackInsinTelemetryTests
+{
+    private const int TestPort = 47823;
+
+    [Fact]
+    public async Task Emit_posts_json_payload_to_loopback()
+    {
+        using var listener = new HttpListener();
+        listener.Prefixes.Add($"http://127.0.0.1:{TestPort}/");
+        listener.Start();
+
+        using var http = new HttpClient();
+        var telemetry = new LoopbackInsinTelemetry(http, NullLogger.Instance);
+        telemetry.Emit("service.started", "version=1.0.14");
+
+        using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(3));
+        var ctxTask = listener.GetContextAsync();
+        var completed = await Task.WhenAny(ctxTask, Task.Delay(Timeout.Infinite, cts.Token));
+        Assert.Same(ctxTask, completed);
+        var ctx = ctxTask.Result;
+
+        Assert.Equal("POST", ctx.Request.HttpMethod);
+        Assert.Equal("/events", ctx.Request.Url!.AbsolutePath);
+        using var sr = new StreamReader(ctx.Request.InputStream, Encoding.UTF8);
+        var body = await sr.ReadToEndAsync();
+        using var doc = JsonDocument.Parse(body);
+        Assert.Equal("service.started", doc.RootElement.GetProperty("kind").GetString());
+        Assert.Equal("version=1.0.14",   doc.RootElement.GetProperty("message").GetString());
+        var at = doc.RootElement.GetProperty("at").GetString();
+        Assert.False(string.IsNullOrEmpty(at));
+        Assert.EndsWith("Z", at);
+
+        ctx.Response.StatusCode = 200;
+        ctx.Response.Close();
+        listener.Stop();
+    }
+
+    [Fact]
+    public async Task Emit_swallows_connection_refused_and_does_not_throw()
+    {
+        using var http = new HttpClient();
+        var telemetry = new LoopbackInsinTelemetry(http, NullLogger.Instance);
+        var ex = Record.Exception(() => telemetry.Emit("service.started", "version=1.0.14"));
+        Assert.Null(ex);
+        await Task.Delay(200);
+    }
+
+    [Fact]
+    public async Task Emit_swallows_500_response_and_does_not_throw()
+    {
+        using var listener = new HttpListener();
+        listener.Prefixes.Add($"http://127.0.0.1:{TestPort}/");
+        listener.Start();
+
+        using var http = new HttpClient();
+        var telemetry = new LoopbackInsinTelemetry(http, NullLogger.Instance);
+        telemetry.Emit("service.started", "version=1.0.14");
+
+        var ctx = await listener.GetContextAsync();
+        ctx.Response.StatusCode = 500;
+        ctx.Response.Close();
+
+        await Task.Delay(200);
+        listener.Stop();
+    }
+}
+```
+
+(`Microsoft.Extensions.Logging.Abstractions` is already brought in transitively via the reference to `Inspectron.Epson` — no NuGet edit needed.)
+
+- [ ] **Step 2: Verify the tests fail**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~LoopbackInsinTelemetry`
+Expected: build error — `LoopbackInsinTelemetry` does not exist.
+
+- [ ] **Step 3: Implement**
+
+Write `Inspectron.Epson/PrintServer/Telemetry/LoopbackInsinTelemetry.cs`:
+
+```csharp
+using System.Net.Http.Json;
+using Microsoft.Extensions.Logging;
+
+namespace Inspectron.Epson.PrintServer.Telemetry;
+
+public sealed class LoopbackInsinTelemetry : IInsinTelemetry
+{
+    private const string Endpoint = "http://127.0.0.1:47823/events";
+    private static readonly TimeSpan RequestTimeout = TimeSpan.FromSeconds(2);
+    private static readonly long WarnIntervalTicks = TimeSpan.FromMinutes(5).Ticks / TimeSpan.TicksPerMillisecond;
+
+    private readonly HttpClient _http;
+    private readonly ILogger _logger;
+    private long _lastWarnMs = -WarnIntervalTicks;
+
+    public LoopbackInsinTelemetry(HttpClient http, ILogger logger)
+    {
+        _http = http;
+        _logger = logger;
+    }
+
+    public void Emit(string kind, string message)
+    {
+        var payload = new
+        {
+            kind,
+            message,
+            at = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.fffZ")
+        };
+        _ = Task.Run(() => SendAsync(payload));
+    }
+
+    private async Task SendAsync(object payload)
+    {
+        try
+        {
+            using var cts = new CancellationTokenSource(RequestTimeout);
+            using var resp = await _http.PostAsJsonAsync(Endpoint, payload, cts.Token);
+            if (!resp.IsSuccessStatusCode)
+                MaybeWarn($"insin loopback returned {(int)resp.StatusCode}");
+        }
+        catch (Exception ex)
+        {
+            MaybeWarn($"insin loopback unreachable at 127.0.0.1:47823 ({ex.GetType().Name}), dropping events");
+        }
+    }
+
+    private void MaybeWarn(string message)
+    {
+        var now = Environment.TickCount64;
+        var last = Interlocked.Read(ref _lastWarnMs);
+        if (now - last < WarnIntervalTicks) return;
+        if (Interlocked.CompareExchange(ref _lastWarnMs, now, last) != last) return;
+        _logger.LogWarning("{Message}", message);
+    }
+}
+```
+
+- [ ] **Step 4: Verify tests pass**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~LoopbackInsinTelemetry`
+Expected: `Passed: 3, Failed: 0`.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add Inspectron.Epson/PrintServer/Telemetry/LoopbackInsinTelemetry.cs \
+        Inspectron.Epson.Tests/Telemetry/LoopbackInsinTelemetryTests.cs
+git commit -m "add LoopbackInsinTelemetry with rate-limited warn logging"
+```
+
+---
+
+## Task 6: `InsinTelemetryDiscoveredPrintersReceiver` — decorator
+
+**Files:**
+- Create: `Inspectron.Epson/PrintServer/DiscoveredPrintersReceiver/InsinTelemetryDiscoveredPrintersReceiver.cs`
+- Create: `Inspectron.Epson.Tests/Telemetry/InsinTelemetryDiscoveredPrintersReceiverTests.cs`
+
+- [ ] **Step 1: Write the failing tests**
+
+Write `Inspectron.Epson.Tests/Telemetry/InsinTelemetryDiscoveredPrintersReceiverTests.cs`:
+
+```csharp
+using EpsonPrintService;
+using Inspectron.Epson;
+using Inspectron.Epson.PrintServer.Telemetry;
+
+namespace Inspectron.Epson.Tests.Telemetry;
+
+public class InsinTelemetryDiscoveredPrintersReceiverTests
+{
+    private sealed class RecordingTelemetry : IInsinTelemetry
+    {
+        public List<(string Kind, string Message)> Events { get; } = new();
+        public void Emit(string kind, string message) => Events.Add((kind, message));
+    }
+
+    private sealed class CountingInner : IDiscoveredPrintersReceiver
+    {
+        public int Calls;
+        public Task OnPrintersDiscoveredAsync(IReadOnlyList<DiscoveredPrinter> printers)
+        {
+            Calls++;
+            return Task.CompletedTask;
+        }
+    }
+
+    private static DiscoveredPrinter Printer(string ip, string model = "TM-T30III") =>
+        new() { IPAddress = ip, ModelName = model };
+
+    [Fact]
+    public async Task First_sighting_emits_discovered_and_online()
+    {
+        var telemetry = new RecordingTelemetry();
+        var inner = new CountingInner();
+        var sut = new InsinTelemetryDiscoveredPrintersReceiver(inner, telemetry);
+
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+
+        Assert.Equal(1, inner.Calls);
+        Assert.Collection(telemetry.Events,
+            e => Assert.Equal("printer.discovered", e.Kind),
+            e => Assert.Equal("printer.online",     e.Kind));
+        Assert.Contains("printer=192.168.1.10", telemetry.Events[0].Message);
+        Assert.Contains("model=TM-T30III",      telemetry.Events[0].Message);
+    }
+
+    [Fact]
+    public async Task Repeat_sighting_emits_nothing()
+    {
+        var telemetry = new RecordingTelemetry();
+        var sut = new InsinTelemetryDiscoveredPrintersReceiver(new CountingInner(), telemetry);
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+        telemetry.Events.Clear();
+
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+
+        Assert.Empty(telemetry.Events);
+    }
+
+    [Fact]
+    public async Task Disappearance_emits_offline()
+    {
+        var telemetry = new RecordingTelemetry();
+        var sut = new InsinTelemetryDiscoveredPrintersReceiver(new CountingInner(), telemetry);
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+        telemetry.Events.Clear();
+
+        await sut.OnPrintersDiscoveredAsync(Array.Empty<DiscoveredPrinter>());
+
+        Assert.Single(telemetry.Events);
+        Assert.Equal("printer.offline", telemetry.Events[0].Kind);
+        Assert.Equal("printer=192.168.1.10", telemetry.Events[0].Message);
+    }
+
+    [Fact]
+    public async Task Reappearance_emits_online_only_not_discovered()
+    {
+        var telemetry = new RecordingTelemetry();
+        var sut = new InsinTelemetryDiscoveredPrintersReceiver(new CountingInner(), telemetry);
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+        await sut.OnPrintersDiscoveredAsync(Array.Empty<DiscoveredPrinter>());
+        telemetry.Events.Clear();
+
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+
+        Assert.Single(telemetry.Events);
+        Assert.Equal("printer.online", telemetry.Events[0].Kind);
+    }
+
+    [Fact]
+    public async Task Telemetry_failures_do_not_break_inner()
+    {
+        var telemetry = new ThrowingTelemetry();
+        var inner = new CountingInner();
+        var sut = new InsinTelemetryDiscoveredPrintersReceiver(inner, telemetry);
+
+        await sut.OnPrintersDiscoveredAsync(new[] { Printer("192.168.1.10") });
+
+        Assert.Equal(1, inner.Calls);
+    }
+
+    private sealed class ThrowingTelemetry : IInsinTelemetry
+    {
+        public void Emit(string kind, string message) => throw new InvalidOperationException("boom");
+    }
+}
+```
+
+- [ ] **Step 2: Verify the tests fail**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~InsinTelemetryDiscoveredPrintersReceiver`
+Expected: build error — decorator does not exist.
+
+- [ ] **Step 3: Implement**
+
+Write `Inspectron.Epson/PrintServer/DiscoveredPrintersReceiver/InsinTelemetryDiscoveredPrintersReceiver.cs`:
+
+```csharp
+using Inspectron.Epson;
+using Inspectron.Epson.PrintServer.Telemetry;
+
+namespace EpsonPrintService;
+
+public sealed class InsinTelemetryDiscoveredPrintersReceiver : IDiscoveredPrintersReceiver
+{
+    private readonly IDiscoveredPrintersReceiver _inner;
+    private readonly IInsinTelemetry _telemetry;
+    private readonly HashSet<string> _seenIps = new();
+    private readonly Dictionary<string, bool> _present = new();
+    private readonly object _stateLock = new();
+
+    public InsinTelemetryDiscoveredPrintersReceiver(
+        IDiscoveredPrintersReceiver inner,
+        IInsinTelemetry telemetry)
+    {
+        _inner = inner;
+        _telemetry = telemetry;
+    }
+
+    public async Task OnPrintersDiscoveredAsync(IReadOnlyList<DiscoveredPrinter> printers)
+    {
+        await _inner.OnPrintersDiscoveredAsync(printers);
+
+        List<(string kind, string message)> toEmit;
+        lock (_stateLock)
+        {
+            toEmit = ComputeEvents(printers);
+        }
+
+        foreach (var (kind, message) in toEmit)
+        {
+            try { _telemetry.Emit(kind, message); }
+            catch { /* swallow: telemetry must never break discovery */ }
+        }
+    }
+
+    private List<(string, string)> ComputeEvents(IReadOnlyList<DiscoveredPrinter> printers)
+    {
+        var events = new List<(string, string)>();
+        var currentIps = new HashSet<string>();
+        foreach (var p in printers)
+        {
+            if (string.IsNullOrEmpty(p.IPAddress)) continue;
+            currentIps.Add(p.IPAddress);
+
+            if (_seenIps.Add(p.IPAddress))
+                events.Add((InsinEventKinds.PrinterDiscovered,
+                    InsinMessageFormatter.Format(("printer", p.IPAddress), ("model", p.ModelName))));
+
+            if (!_present.TryGetValue(p.IPAddress, out var wasPresent) || !wasPresent)
+                events.Add((InsinEventKinds.PrinterOnline,
+                    InsinMessageFormatter.Format(("printer", p.IPAddress))));
+
+            _present[p.IPAddress] = true;
+        }
+
+        foreach (var kv in _present.ToList())
+        {
+            if (kv.Value && !currentIps.Contains(kv.Key))
+            {
+                events.Add((InsinEventKinds.PrinterOffline,
+                    InsinMessageFormatter.Format(("printer", kv.Key))));
+                _present[kv.Key] = false;
+            }
+        }
+
+        return events;
+    }
+}
+```
+
+- [ ] **Step 4: Verify tests pass**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~InsinTelemetryDiscoveredPrintersReceiver`
+Expected: `Passed: 5, Failed: 0`.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add Inspectron.Epson/PrintServer/DiscoveredPrintersReceiver/InsinTelemetryDiscoveredPrintersReceiver.cs \
+        Inspectron.Epson.Tests/Telemetry/InsinTelemetryDiscoveredPrintersReceiverTests.cs
+git commit -m "add InsinTelemetryDiscoveredPrintersReceiver decorator"
+```
+
+---
+
+## Task 7: Thread `IInsinTelemetry` into `PrinterQueue` and emit job outcomes
+
+**Files:**
+- Modify: `Inspectron.Epson/Queue/PrinterQueue.cs`
+- Modify: `Inspectron.Epson/Queue/PrintServer.cs`
+
+Note: no unit test for the queue — the queue's readers-writer lock + background loop makes a fast, deterministic unit test disproportionately expensive. Correctness of the mapping is covered by `InsinEventKindsTests`; end-to-end wiring is covered by the manual acceptance test in the spec. If a bug surfaces we can add an integration test then.
+
+- [ ] **Step 1: Add the constructor parameter to `PrinterQueue`**
+
+Edit `Inspectron.Epson/Queue/PrinterQueue.cs`:
+
+Change the `using` block at the top and add:
+
+```csharp
+using Inspectron.Epson.PrintServer.Telemetry;
+```
+
+Change the field block (after `_statusReporter`) — add:
+
+```csharp
+    private readonly IInsinTelemetry _telemetry;
+```
+
+Change the constructor signature and body:
+
+```csharp
+    public PrinterQueue(string printerIp, IPrintService printService, ILogger logger, PrintServer printServer, IJobStatusReporter statusReporter, IInsinTelemetry telemetry)
+    {
+        PrinterIp = printerIp;
+        _queue = new ConcurrentQueue<PrintJob>();
+        _priorityQueue = new ConcurrentStack<PrintJob>();
+        _signal = new SemaphoreSlim(0);
+        _cancellationTokenSource = new CancellationTokenSource();
+        _printService = printService;
+        _logger = logger;
+        _printServer = printServer;
+        _statusReporter = statusReporter;
+        _telemetry = telemetry;
+    }
+```
+
+- [ ] **Step 2: Emit on success and failure in `ProcessQueueAsync`**
+
+Still in `PrinterQueue.cs`, replace the `_printService.PrintAsync(...)` block. Find:
+
+```csharp
+                    _printServer.EnterPrintLock();
+                    try
+                    {
+                        // Call the actual print function
+                        var result = await _printService.PrintAsync(PrinterIp, job);
+```
+
+Replace with:
+
+```csharp
+                    _printServer.EnterPrintLock();
+                    var stopwatch = System.Diagnostics.Stopwatch.StartNew();
+                    try
+                    {
+                        // Call the actual print function
+                        var result = await _printService.PrintAsync(PrinterIp, job);
+                        stopwatch.Stop();
+```
+
+Then, inside the existing `if (!result.Success)` branch, after the existing `else` (Re-queue with retry) branch — right at the end of the `else` before the closing `}`— add the emit call. Locate the current success branch:
+
+```csharp
+                        else
+                        {
+                            _logger.LogInformation("Job completed successfully on printer {PrinterId}",  PrinterIp);
+                            await _statusReporter.ReportStatusAsync(job, PrintJobStatus.Completed);
+                        }
+```
+
+Replace with:
+
+```csharp
+                        else
+                        {
+                            _logger.LogInformation("Job completed successfully on printer {PrinterId}",  PrinterIp);
+                            await _statusReporter.ReportStatusAsync(job, PrintJobStatus.Completed);
+                            SafeEmit(InsinEventKinds.JobPrinted, InsinMessageFormatter.Format(
+                                ("printer",     PrinterIp),
+                                ("receiptType", job.Document?.ReceiptType.ToString()),
+                                ("durationMs",  stopwatch.ElapsedMilliseconds.ToString())));
+                        }
+```
+
+Similarly, inside `if (!result.Success)`, after the three-branch mapping, ADD an emit call right after the closing `}` of the outermost success/failure decision. To keep this simple, replace the entire `if (!result.Success)` block with:
+
+```csharp
+                        if (!result.Success)
+                        {
+                            var failKind = InsinEventKinds.MapErrorTypeToKind(result.ErrorType);
+                            SafeEmit(failKind, InsinMessageFormatter.Format(
+                                ("printer",     PrinterIp),
+                                ("receiptType", job.Document?.ReceiptType.ToString()),
+                                ("retry",       job.RetryCount.ToString()),
+                                ("error",       result.ErrorType.ToString())));
+
+                            if (result.ErrorType == PrintErrorType.ConversionError)
+                            {
+                                _logger.LogWarning("Job failed due to conversion error, not re-queuing");
+                                await _statusReporter.ReportStatusAsync(job, PrintJobStatus.Failed);
+                            }
+                            else if (result.ErrorType == PrintErrorType.Offline)
+                            {
+                                _logger.LogWarning("Printer is offline, job failed");
+                                await _statusReporter.ReportStatusAsync(job, PrintJobStatus.Failed);
+                            }
+                            else
+                            {
+                                // Re-queue with retry logic
+                                job.RetryCount++;
+                                if (job.RetryCount == 1)
+                                {
+                                    await _statusReporter.ReportStatusAsync(job, PrintJobStatus.OutOfPaper);
+                                }
+                                _logger.LogWarning("Job failed, retrying ({RetryCount}/3)", job.RetryCount);
+                                await Task.Delay(5000, cancellationToken); // Wait before retry
+                                EnqueuePriority(job);
+                            }
+                        }
+```
+
+- [ ] **Step 3: Add the `SafeEmit` helper**
+
+Add this method at the bottom of `PrinterQueue` (just before the closing brace of the class):
+
+```csharp
+    private void SafeEmit(string kind, string message)
+    {
+        try { _telemetry.Emit(kind, message); }
+        catch (Exception ex) { _logger.LogWarning(ex, "insin telemetry emit failed"); }
+    }
+```
+
+- [ ] **Step 4: Confirm `PrintJobFromSignalR.ReceiptType` is still an `int`**
+
+Run: `grep -n "ReceiptType" Inspectron.Epson/PrintServer/JobSources/SignalRPrintJobSource.cs`
+
+Expected: hit for `public int ReceiptType`. The `.ToString()` in the emits above assumes `int`. If the field is now a `string`, drop `.ToString()`. If the field was renamed or removed, adapt the emit's `receiptType` argument.
+
+- [ ] **Step 5: Update `PrintServer.RegisterPrinter` to pass the telemetry**
+
+Edit `Inspectron.Epson/Queue/PrintServer.cs`. Change the field block (after `_statusReporter`) — add:
+
+```csharp
+    private readonly Inspectron.Epson.PrintServer.Telemetry.IInsinTelemetry _telemetry;
+```
+
+Change the constructor:
+
+```csharp
+    public PrintServer(IPrintService printService, ILogger logger, IJobStatusReporter statusReporter, Inspectron.Epson.PrintServer.Telemetry.IInsinTelemetry telemetry)
+    {
+        _printService = printService;
+        _logger = logger;
+        _statusReporter = statusReporter;
+        _telemetry = telemetry;
+        _printerQueues = new ConcurrentDictionary<string, PrinterQueue>();
+    }
+```
+
+Change the `RegisterPrinter` call:
+
+```csharp
+    public void RegisterPrinter(string printerIp)
+    {
+        var queue = new PrinterQueue(printerIp, _printService, _logger, this, _statusReporter, _telemetry);
+        // ... rest unchanged
+```
+
+- [ ] **Step 6: Verify the solution builds**
+
+Run: `dotnet build Inspectron.Epson.slnx`
+Expected: build succeeds with 0 errors. (Bootstrapper will still work because Ninject resolves `IInsinTelemetry` at runtime — we bind it in Task 8.)
+
+- [ ] **Step 7: Verify tests still pass**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj`
+Expected: all previous tests still pass.
+
+- [ ] **Step 8: Commit**
+
+```bash
+git add Inspectron.Epson/Queue/PrinterQueue.cs Inspectron.Epson/Queue/PrintServer.cs
+git commit -m "emit insin telemetry for job outcomes in PrinterQueue"
+```
+
+---
+
+## Task 8: DI wiring + `service.started` emit in `PrintServerBootstrapper`
+
+**Files:**
+- Modify: `EpsonPrintService/PrintServerBootstrapper.cs`
+
+- [ ] **Step 1: Add usings**
+
+Edit `EpsonPrintService/PrintServerBootstrapper.cs`, add near the top:
+
+```csharp
+using Inspectron.Epson.PrintServer.Telemetry;
+using System.Reflection;
+```
+
+- [ ] **Step 2: Bind `IInsinTelemetry`**
+
+Inside `StartAsync()`, right after `_kernel.Bind<HttpClient>()...`, add:
+
+```csharp
+        if (_config.EmulationMode)
+            _kernel.Bind<IInsinTelemetry>().To<NullInsinTelemetry>().InSingletonScope();
+        else
+            _kernel.Bind<IInsinTelemetry>().To<LoopbackInsinTelemetry>().InSingletonScope();
+```
+
+- [ ] **Step 3: Wrap `IDiscoveredPrintersReceiver` with the decorator**
+
+In `StartAsync()`, find:
+
+```csharp
+        _kernel.Bind<IDiscoveredPrintersReceiver>().To<JamesDiscoveredPrintersReceiver>().InSingletonScope();
+```
+
+Replace with:
+
+```csharp
+        _kernel.Bind<JamesDiscoveredPrintersReceiver>().ToSelf().InSingletonScope();
+        _kernel.Bind<IDiscoveredPrintersReceiver>().ToMethod(ctx =>
+            new InsinTelemetryDiscoveredPrintersReceiver(
+                ctx.Kernel.Get<JamesDiscoveredPrintersReceiver>(),
+                ctx.Kernel.Get<IInsinTelemetry>()))
+            .InSingletonScope();
+```
+
+- [ ] **Step 4: Emit `service.started` at the end of `StartAsync()`**
+
+At the end of `StartAsync()`, right after the existing `Console.WriteLine("Print server started.");`, add:
+
+```csharp
+        var version = Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "unknown";
+        var telemetry = _kernel.Get<IInsinTelemetry>();
+        try
+        {
+            telemetry.Emit(InsinEventKinds.ServiceStarted, InsinMessageFormatter.Format(
+                ("version",      version),
+                ("restaurantId", _config.RestaurantId)));
+        }
+        catch { /* telemetry must never fail startup */ }
+```
+
+- [ ] **Step 5: Verify emulation-mode default binding still works**
+
+Run: `dotnet build Inspectron.Epson.slnx`
+Expected: build succeeds. Ninject will resolve `IInsinTelemetry` because we always bind exactly one implementation.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add EpsonPrintService/PrintServerBootstrapper.cs
+git commit -m "bind IInsinTelemetry in DI and emit service.started"
+```
+
+---
+
+## Task 9: Move Linux config path to `/opt/epson-print-service/`
+
+**Files:**
+- Modify: `EpsonPrintService/ConfigurationPaths.cs`
+- Create: `Inspectron.Epson.Tests/Configuration/ConfigurationPathsTests.cs`
+
+- [ ] **Step 1: Write the failing test**
+
+Write `Inspectron.Epson.Tests/Configuration/ConfigurationPathsTests.cs`:
+
+```csharp
+using System.Runtime.InteropServices;
+using EpsonPrintService;
+
+namespace Inspectron.Epson.Tests.Configuration;
+
+public class ConfigurationPathsTests
+{
+    [Fact]
+    public void GetConfigPath_uses_opt_dir_on_linux_when_env_unset_and_no_local_file()
+    {
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Linux)) return;
+        var previous = Environment.GetEnvironmentVariable("EPSON_CONFIG_PATH");
+        Environment.SetEnvironmentVariable("EPSON_CONFIG_PATH", null);
+        try
+        {
+            var path = ConfigurationPaths.GetConfigPath();
+            Assert.Equal("/opt/epson-print-service/config.txt", path);
+        }
+        finally
+        {
+            Environment.SetEnvironmentVariable("EPSON_CONFIG_PATH", previous);
+        }
+    }
+
+    [Fact]
+    public void EPSON_CONFIG_PATH_override_still_wins()
+    {
+        var previous = Environment.GetEnvironmentVariable("EPSON_CONFIG_PATH");
+        Environment.SetEnvironmentVariable("EPSON_CONFIG_PATH", "/tmp/override.txt");
+        try
+        {
+            var path = ConfigurationPaths.GetConfigPath();
+            Assert.Equal("/tmp/override.txt", path);
+        }
+        finally
+        {
+            Environment.SetEnvironmentVariable("EPSON_CONFIG_PATH", previous);
+        }
+    }
+}
+```
+
+The first test guards against local checkouts having a stray `./config.txt` in the working directory that would otherwise satisfy `File.Exists(LocalConfigFileName)` and trigger the migration branch — that branch is unavoidably filesystem-dependent, so the test is written to only verify the *default* path when neither env nor local file exists. In a clean CI env that's the case; on a dev machine ensure no `./config.txt` is next to the test binary output before running.
+
+- [ ] **Step 2: Verify the tests fail**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~ConfigurationPathsTests`
+Expected: on Linux, first test fails with `/root/epsonprintservice/config.txt` !=  `/opt/epson-print-service/config.txt`.
+
+- [ ] **Step 3: Implement**
+
+Edit `EpsonPrintService/ConfigurationPaths.cs`. Change line 7:
+
+```csharp
+    private const string LinuxConfigDir = "/opt/epson-print-service";
+```
+
+- [ ] **Step 4: Verify tests pass**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj --filter FullyQualifiedName~ConfigurationPathsTests`
+Expected: `Passed: 2, Failed: 0` (or the Linux-only test skipped on Windows).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add EpsonPrintService/ConfigurationPaths.cs \
+        Inspectron.Epson.Tests/Configuration/ConfigurationPathsTests.cs
+git commit -m "move linux config path to /opt/epson-print-service"
+```
+
+---
+
+## Task 10: Package assets — `deploy/insin/`
+
+**Files:**
+- Create: `deploy/insin/install.cfg`
+- Create: `deploy/insin/postinst`
+- Create: `deploy/insin/prem`
+- Create: `deploy/insin/epson.service`
+- Create: `deploy/insin/print_server.service`
+
+- [ ] **Step 1: Create `install.cfg`**
+
+Write `deploy/insin/install.cfg`:
+
+```ini
+install_path=/opt/epson-print-service
+```
+
+- [ ] **Step 2: Create `postinst`**
+
+Write `deploy/insin/postinst`:
+
+```bash
+#!/usr/bin/env bash
+set -euo pipefail
+INSTALL_DIR="$(pwd)"
+chmod +x "$INSTALL_DIR/EpsonPrintService"
+mkdir -p /var/lib/epson-print-service
+install -m 644 epson.service        /etc/systemd/system/epson.service
+install -m 644 print_server.service /etc/systemd/system/print_server.service
+systemctl daemon-reload
+systemctl enable --now epson.service print_server.service
+```
+
+Note the binary name: `EpsonPrintService` (default `dotnet publish` output for the `EpsonPrintService` project — no `-p:AssemblyName` override).
+
+- [ ] **Step 3: Create `prem`**
+
+Write `deploy/insin/prem`:
+
+```bash
+#!/usr/bin/env bash
+set -euo pipefail
+systemctl disable --now epson.service print_server.service 2>/dev/null || true
+rm -f /etc/systemd/system/epson.service /etc/systemd/system/print_server.service
+systemctl daemon-reload 2>/dev/null || true
+```
+
+- [ ] **Step 4: Create `epson.service`**
+
+Write `deploy/insin/epson.service`:
+
+```ini
+[Unit]
+Description=Epson Print Service
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/epson-print-service
+ExecStart=/opt/epson-print-service/EpsonPrintService
+Restart=on-failure
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target
+```
+
+- [ ] **Step 5: Create `print_server.service`**
+
+Copy the existing `EpsonPrintService/print_server.service` into `deploy/insin/print_server.service`, then rewrite `ExecStart` / `WorkingDirectory` to the new install path if they aren't already:
+
+Write `deploy/insin/print_server.service`:
+
+```ini
+[Unit]
+Description=Epson Print Server (companion)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+WorkingDirectory=/opt/epson-print-service
+ExecStart=/opt/epson-print-service/EpsonPrintService
+Restart=on-failure
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target
+```
+
+If the original `print_server.service` has a different purpose than a duplicate of `epson.service` (check the file), preserve its `ExecStart` but retarget the working directory. When in doubt, treat it as a duplicate — this file exists in the current repo but is likely legacy.
+
+- [ ] **Step 6: Set executable bits and commit**
+
+```bash
+chmod +x deploy/insin/postinst deploy/insin/prem
+git add deploy/insin/
+git commit -m "add insin package assets (install.cfg, hooks, systemd units)"
+```
+
+Confirm executable bits landed in git:
+
+Run: `git ls-files -s deploy/insin/postinst deploy/insin/prem`
+Expected: mode `100755` on both.
+
+---
+
+## Task 11: Publish script + .gitignore
+
+**Files:**
+- Create: `scripts/publish-insin.sh`
+- Modify: `.gitignore`
+
+- [ ] **Step 1: Create the script**
+
+Write `scripts/publish-insin.sh`:
+
+```bash
+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${INSIN_URL:?INSIN_URL not set}"
+: "${INSIN_TOKEN:?INSIN_TOKEN not set}"
+
+repo_root="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$repo_root"
+
+version=$(dotnet msbuild EpsonPrintService/EpsonPrintService.csproj \
+            -getProperty:Version -nologo | tr -d '[:space:]')
+echo "Publishing epson-print-service@${version}"
+
+payload="publish/payload"
+rm -rf publish && mkdir -p "$payload"
+dotnet publish EpsonPrintService/EpsonPrintService.csproj \
+  -c Release -r linux-arm64 --self-contained true \
+  -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true \
+  -o "$payload"
+
+cp deploy/insin/install.cfg          "$payload/"
+cp deploy/insin/postinst             "$payload/"
+cp deploy/insin/prem                 "$payload/"
+cp deploy/insin/epson.service        "$payload/"
+cp deploy/insin/print_server.service "$payload/"
+chmod +x "$payload/postinst" "$payload/prem"
+
+mkdir -p .tools
+manifest=$(curl -fsSL "$INSIN_URL/api/v1/downloads/cli")
+cli_version=$(printf '%s' "$manifest" \
+  | python3 -c 'import json,sys; print(json.load(sys.stdin)[0]["version"])')
+cli_filename=$(printf '%s' "$manifest" \
+  | python3 -c 'import json,sys; a=next(x for x in json.load(sys.stdin)[0]["artifacts"] if x["rid"]=="linux-arm64"); print(a["filename"])')
+if [ ! -x ".tools/insin/insin" ] || [ "$(cat .tools/insin/.version 2>/dev/null)" != "$cli_version" ]; then
+  echo "Fetching insin CLI $cli_version"
+  curl -fsSL "$INSIN_URL/api/v1/downloads/cli/$cli_version/$cli_filename" -o /tmp/insin.tar.gz
+  rm -rf .tools/insin && mkdir -p .tools/insin
+  tar -xzf /tmp/insin.tar.gz -C .tools/insin
+  chmod +x .tools/insin/insin
+  echo "$cli_version" > .tools/insin/.version
+fi
+insin_bin="$repo_root/.tools/insin/insin"
+
+( cd "$payload" && "$insin_bin" pack "epson-print-service@${version}" )
+pkg="publish/packages/epson-print-service@${version}.pkg"
+[ -f "$pkg" ] || { echo "expected $pkg missing"; exit 1; }
+
+"$insin_bin" publish "$pkg"
+echo "Published epson-print-service@${version}"
+```
+
+- [ ] **Step 2: Make it executable**
+
+Run: `chmod +x scripts/publish-insin.sh`
+
+- [ ] **Step 3: Update `.gitignore`**
+
+Read `.gitignore` and append (only if not already present):
+
+```gitignore
+
+# Insin publish artifacts
+.tools/
+publish/
+```
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add scripts/publish-insin.sh .gitignore
+git commit -m "add scripts/publish-insin.sh for manual insin package publish"
+```
+
+Confirm executable bit landed:
+
+Run: `git ls-files -s scripts/publish-insin.sh`
+Expected: mode `100755`.
+
+---
+
+## Task 12: Final build + acceptance-test rehearsal
+
+**Files:** (none modified)
+
+- [ ] **Step 1: Full solution build**
+
+Run: `dotnet build Inspectron.Epson.slnx -c Release`
+Expected: 0 errors, 0 warnings from new code.
+
+- [ ] **Step 2: Full test run**
+
+Run: `dotnet test Inspectron.Epson.Tests/Inspectron.Epson.Tests.csproj`
+Expected: all tests pass. Sum of previous tasks: `Passed: 24+, Failed: 0` (1 sanity + 6 formatter + 1 null + 6 kinds + 3 loopback + 5 decorator + 2 config paths).
+
+- [ ] **Step 3: Dry-run the publish script — build phase only**
+
+Run:
+
+```bash
+dotnet publish EpsonPrintService/EpsonPrintService.csproj \
+  -c Release -r linux-arm64 --self-contained true \
+  -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true \
+  -o publish/payload
+ls -lh publish/payload/EpsonPrintService
+```
+
+Expected: a single ELF binary around 50-90 MB in size.
+
+Clean up: `rm -rf publish/`
+
+- [ ] **Step 4: Print the acceptance-test checklist**
+
+The remaining acceptance steps are manual and hardware-bound (see spec, section "Manual acceptance test"): publish → assign in Insin admin UI → wait one heartbeat → confirm systemd status → confirm events in admin UI → trigger real print → simulate paper-out → bump version + upgrade.
+
+Do NOT run `./scripts/publish-insin.sh` as part of this task — publishing is a deliberate, hand-triggered step that ships to production.
+
+- [ ] **Step 5: Commit any remaining formatting changes and confirm clean tree**
+
+Run: `git status`
+Expected: `nothing to commit, working tree clean`.