docs: Campaign LA — pinned launch-contract schema COMMITTED into plan LA1

The LA3 Opus review process note was right: the contract both sides
implement lived only in orchestrator prompts, which is exactly the drift
mode the pin exists to prevent (and it produced the paths-key CRITICAL).
The schema, field rules, probe-mode discriminator, and status vocabulary
are now a binding plan section; amendments change this text first,
implementations second. Ledger: LA3 fix round dispatched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/AcDream.App.Tests/Configuration/RuntimeOptionsSessionConfigTests.cs

@@ -0,0 +1,148 @@
+using AcDream.App;
+using AcDream.App.Configuration;
+using AcDream.Runtime.Session;
+
+namespace AcDream.App.Tests.Configuration;
+
+/// <summary>
+/// Campaign LA slice LA1: round-trip tests for
+/// <see cref="RuntimeOptions.FromSessionConfig"/> — the overlay that turns a
+/// parsed <see cref="SessionConfiguration"/>/<see cref="SessionDescriptor"/>
+/// into the same typed bundle the env-var dev flow produces.
+/// </summary>
+public sealed class RuntimeOptionsSessionConfigTests
+{
+    [Fact]
+    public void SessionConfigOverridesLiveSettingsAndCarriesAllFiveNewFields()
+    {
+        var config = new SessionConfiguration { Version = 1 };
+        var session = new SessionDescriptor
+        {
+            Id = "gui-session",
+            Endpoint = new SessionEndpointDescriptor
+            {
+                Host = "192.168.1.50",
+                Port = 9123,
+            },
+            Account = "guiaccount",
+            Character = new SessionCharacterSelectorDescriptor { Name = "GuiToon" },
+            Credential = new SessionCredentialDescriptor
+            {
+                Provider = SessionCredentialProviderKind.Environment,
+                Reference = "IGNORED",
+            },
+            Plugins = ["PluginA", "PluginB"],
+            LoginCommands = ["/tell x, hi"],
+            LoginCommandDelayMs = 900,
+            StatusFile = "status.jsonl",
+        };
+
+        RuntimeOptions options = RuntimeOptions.FromSessionConfig(
+            "D:\\dat",
+            _ => null,
+            "session.json",
+            config,
+            session,
+            "resolved-password");
+
+        Assert.True(options.LiveMode);
+        Assert.Equal("192.168.1.50", options.LiveHost);
+        Assert.Equal(9123, options.LivePort);
+        Assert.Equal("guiaccount", options.LiveUser);
+        Assert.Equal("resolved-password", options.LivePass);
+        Assert.Equal("session.json", options.SessionConfigPath);
+        Assert.Equal("gui-session", options.SessionId);
+        Assert.Equal(
+            new LiveSessionCharacterSelector(null, null, "GuiToon"),
+            options.LiveCharacterSelector);
+        Assert.Equal("status.jsonl", options.StatusFilePath);
+        Assert.Equal(["PluginA", "PluginB"], options.Plugins);
+        Assert.Equal(["/tell x, hi"], options.LoginCommands);
+        Assert.Equal(900, options.LoginCommandDelayMs);
+    }
+
+    [Fact]
+    public void AbsentCharacterSelectorLeavesFirstAvailableFallbackInEffect()
+    {
+        var config = new SessionConfiguration { Version = 1 };
+        var session = new SessionDescriptor
+        {
+            Id = "no-selector",
+            Endpoint = new SessionEndpointDescriptor { Host = "127.0.0.1", Port = 9000 },
+            Account = "account",
+            Credential = new SessionCredentialDescriptor
+            {
+                Provider = SessionCredentialProviderKind.Environment,
+                Reference = "X",
+            },
+        };
+
+        RuntimeOptions options = RuntimeOptions.FromSessionConfig(
+            "D:\\dat",
+            _ => null,
+            "session.json",
+            config,
+            session,
+            "password");
+
+        Assert.Null(options.LiveCharacterSelector);
+        Assert.Null(options.Plugins);
+        Assert.Empty(options.LoginCommands);
+        Assert.Equal(500, options.LoginCommandDelayMs);
+        Assert.Null(options.StatusFilePath);
+    }
+
+    [Fact]
+    public void ProcessContentOverridesDatDirectoryAndPreparedAssetPath()
+    {
+        var config = new SessionConfiguration
+        {
+            Version = 1,
+            Process = new SessionProcessSettings
+            {
+                Content = new SessionContentDescriptor
+                {
+                    DatDirectory = "D:\\configured-dats",
+                    PreparedAssetPath = "D:\\configured-dats\\acdream.pak",
+                },
+            },
+        };
+        var session = new SessionDescriptor
+        {
+            Id = "content-session",
+            Endpoint = new SessionEndpointDescriptor { Host = "127.0.0.1", Port = 9000 },
+            Account = "account",
+            Credential = new SessionCredentialDescriptor
+            {
+                Provider = SessionCredentialProviderKind.Environment,
+                Reference = "X",
+            },
+        };
+
+        RuntimeOptions options = RuntimeOptions.FromSessionConfig(
+            "D:\\configured-dats",
+            _ => null,
+            "session.json",
+            config,
+            session,
+            "password");
+
+        Assert.Equal(
+            "D:\\configured-dats\\acdream.pak",
+            options.PreparedAssetPath);
+    }
+
+    [Fact]
+    public void EnvironmentFlowLeavesEveryNewFieldAtItsNothingConfiguredDefault()
+    {
+        RuntimeOptions options = RuntimeOptions.Parse("D:\\dat", _ => null);
+
+        Assert.Null(options.SessionConfigPath);
+        Assert.Null(options.SessionId);
+        Assert.Null(options.LiveCharacterSelector);
+        Assert.Null(options.StatusFilePath);
+        Assert.Null(options.Plugins);
+        Assert.Empty(options.LoginCommands);
+        Assert.Equal(500, options.LoginCommandDelayMs);
+    }
+}