Service: drop the WASAPI inputs (mic) list — outputs and apps only

The service streams a machine's OUTPUT audio (or specific apps); capturing a mic from an
unattended, logged-out box isn't a use case (Ed). Removed the "WASAPI audio inputs to
send" list from the service config dialog, and made the service ignore inputs everywhere:

- ServiceProfileDialog: removed the inputs CheckedListBox, its status label, its row and
  accessibility wiring. Save now clears SelectedWasapiSendInputs so a profile saved by an
  older build can't keep a mic streaming.
- ServiceSendHost.BuildSendSpecs: removed the input-spec loop — a legacy profile's inputs
  are deliberately ignored.

(The main app is unchanged: it still has its WASAPI inputs list and AudioDeviceCatalog
.LoadInputs stays for it.)

Test: the service-parity test now adds a mic to the profile and asserts BuildSendSpecs
emits only per-application specs and never a CaptureKind.Input. Gate 46/46.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RemSound.App/SelfTest.cs

@@ -1000,11 +1000,14 @@ internal static class SelfTest
         {
             var appsProfile = new Profile { WasapiSendMode = "applications", SendAllApplications = true };
             appsProfile.SelectedSendApplications.Add("nonexistent-proc-for-test");
+            appsProfile.SelectedWasapiSendInputs.Add("some-mic-id");   // legacy input selection must be ignored
             var appSpecs = ServiceSendHost.BuildSendSpecs(appsProfile);
             Check(!appSpecs.Any(s => s.Kind == CaptureKind.Loopback),
                 "applications mode must NOT produce a whole-system loopback spec, even with SendAllApplications=true");
-            Check(appSpecs.All(s => s.Kind is CaptureKind.ProcessLoopback or CaptureKind.Input),
-                "applications mode must build only per-application (or input) specs — the 'send all' path is gone");
+            Check(appSpecs.All(s => s.Kind == CaptureKind.ProcessLoopback),
+                "the service builds only per-application specs — no whole-system loopback, and no WASAPI inputs");
+            Check(!appSpecs.Any(s => s.Kind == CaptureKind.Input),
+                "the service must never send WASAPI inputs, even if a legacy profile still lists one");
         }
         return "service forces Opus + 2.5ms frame + lock-to-clock; apps mode is specific-apps-only; crypto matches";
     }

src/RemSound.App/ServiceProfileDialog.cs

@@ -30,9 +30,9 @@ internal sealed class ServiceProfileDialog : Form
     private readonly Label outputsStatus = new() { AutoSize = true, Text = "No output device selected." };
     private readonly CheckedListBox appsList = new() { CheckOnClick = true, Width = 460, Height = 110, AccessibleName = "Applications to send (Alt+3)" };
     private readonly Label appsStatus = new() { AutoSize = true, Text = "No application selected." };
-    private readonly CheckedListBox inputsList = new() { CheckOnClick = true, Width = 460, Height = 90, AccessibleName = "WASAPI audio inputs to send (Alt+4)" };
-    private readonly Label inputsStatus = new() { AutoSize = true, Text = "No input device selected." };
-    private MnemonicLabel? sendModeLabel, outputsLabel, appsLabel, inputsLabel;
+    // No WASAPI-inputs (microphone/line-in) list: the service sends this machine's OUTPUT audio (or
+    // specific apps) only — capturing a mic from an unattended, logged-out box isn't a use case (Ed).
+    private MnemonicLabel? sendModeLabel, outputsLabel, appsLabel;
 
     // No "Audio profile" tab: the service always sends Opus at the live-jamming frame (2.5 ms), Small
     // packets, and locked to the audio clock — the settings Ed found sound good. They're forced in
@@ -154,11 +154,9 @@ internal sealed class ServiceProfileDialog : Form
         sendModeLabel = AddListRow(panel, 0, "How to send WASAPI audio (Alt+&1)", sendModeList);
         outputsLabel = FormLayoutRows.AddCheckedListRow(panel, 1, "WASAPI audio outputs to send (Alt+&2)", outputsList, outputsStatus, l => l.Focus());
         appsLabel = FormLayoutRows.AddCheckedListRow(panel, 2, "Applications to send (Alt+&3)", appsList, appsStatus, l => l.Focus());
-        inputsLabel = FormLayoutRows.AddCheckedListRow(panel, 3, "WASAPI audio inputs to send (Alt+&4)", inputsList, inputsStatus, l => l.Focus());
 
         CheckedListAccessibility.Wire(outputsList, outputsStatus, "output device");
         CheckedListAccessibility.Wire(appsList, appsStatus, "application");
-        CheckedListAccessibility.Wire(inputsList, inputsStatus, "input device");
 
         // "Use Windows default output" is exclusive, same as the main app: while it's ticked the specific
         // output cards can't be, and ticking it clears them.
@@ -221,7 +219,6 @@ internal sealed class ServiceProfileDialog : Form
             // Default is exclusive: if the profile carries the follower, drop any specific outputs it also
             // carried (already inside the suppressAppEvents guard set at the top of LoadFromProfile).
             if (AudioDefaultFollower.IsFollowerChecked(outputsList)) AudioDefaultFollower.UncheckRealDevices(outputsList);
-            PopulateDeviceList(inputsList, AudioDeviceCatalog.LoadInputs(), working.SelectedWasapiSendInputs);
 
             var appsMode = ProcessLoopbackCapture.IsSupported
                 && string.Equals(working.WasapiSendMode, "applications", StringComparison.OrdinalIgnoreCase);
@@ -245,7 +242,9 @@ internal sealed class ServiceProfileDialog : Form
     private void SaveToProfile()
     {
         working.SelectedWasapiSendOutputs = CheckedIds(outputsList);
-        working.SelectedWasapiSendInputs = CheckedIds(inputsList);
+        // The service never sends WASAPI inputs (no mic list any more) — clear any legacy selection so a
+        // profile saved by an older build can't keep a mic streaming.
+        working.SelectedWasapiSendInputs = new List<string>();
         working.WasapiSendMode = sendModeList.SelectedIndex == 1 ? "applications" : "devices";
         // Applications mode = pick specific apps only (matches the main app; the "send all applications"
         // option was removed from both). Force the legacy flag off so a stale profile that still carries

src/RemSound.App/ServiceSendHost.cs

@@ -600,8 +600,8 @@ public sealed class ServiceSendHost : IDisposable
                 }
             }
         }
-        foreach (var id in p.SelectedWasapiSendInputs.Distinct())
-            specs.Add(new CaptureSourceSpec(id, CaptureKind.Input, id));
+        // The service never sends WASAPI inputs (mics/line-ins) — outputs and specific apps only. Any
+        // SelectedWasapiSendInputs left in an old profile is deliberately ignored here.
         return specs;
     }