Merge hands/mill-votes-cut-0a: the live migration-discovery fix on main

Concept Mill votes Cut 0a (concept-mill-votes:cut_report:cut-0a.h1), held by
Soul (concept-mill-votes:verdict:cut-0a.s1). daedcc4, the live release, is now
an ancestor of main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Bifrost.Web/Data/Migrations/20260608210000_AddHeimdallUserIdentity.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -5,6 +6,7 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Bifrost.Web.Data.Migrations
 {
     /// <inheritdoc />
+    [DbContext(typeof(BifrostDbContext))]
     [Migration("20260608210000_AddHeimdallUserIdentity")]
     public partial class AddHeimdallUserIdentity : Migration
     {

src/Bifrost.Web/Data/Migrations/20260609143000_AddPatronSupportDerivation.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -5,6 +6,7 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Bifrost.Web.Data.Migrations
 {
     /// <inheritdoc />
+    [DbContext(typeof(BifrostDbContext))]
     [Migration("20260609143000_AddPatronSupportDerivation")]
     public partial class AddPatronSupportDerivation : Migration
     {

src/Bifrost.Web/Data/Migrations/20260609160000_AddExternalPatronProviderIntake.cs

@@ -1,10 +1,12 @@
 using Bifrost.Web.Domain;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
 
 namespace Bifrost.Web.Data.Migrations
 {
+    [DbContext(typeof(BifrostDbContext))]
     [Migration("20260609160000_AddExternalPatronProviderIntake")]
     public partial class AddExternalPatronProviderIntake : Migration
     {

src/Bifrost.Web/Data/Migrations/20260622142000_AddBridgeActionIdentityProvenance.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -5,6 +6,8 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Bifrost.Web.Data.Migrations
 {
     /// <inheritdoc />
+    [DbContext(typeof(BifrostDbContext))]
+    [Migration("20260622142000_AddBridgeActionIdentityProvenance")]
     public partial class AddBridgeActionIdentityProvenance : Migration
     {
         /// <inheritdoc />

src/Bifrost.Web/Data/Migrations/20260622165000_AddBifrostNativeIdentity.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -5,6 +6,7 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Bifrost.Web.Data.Migrations
 {
     /// <inheritdoc />
+    [DbContext(typeof(BifrostDbContext))]
     [Migration("20260622165000_AddBifrostNativeIdentity")]
     public partial class AddBifrostNativeIdentity : Migration
     {

src/Bifrost.Web/Data/Migrations/20260622202000_AddBridgeActionTargetSurfaceName.cs

@@ -1,3 +1,4 @@
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -5,6 +6,8 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Bifrost.Web.Data.Migrations
 {
     /// <inheritdoc />
+    [DbContext(typeof(BifrostDbContext))]
+    [Migration("20260622202000_AddBridgeActionTargetSurfaceName")]
     public partial class AddBridgeActionTargetSurfaceName : Migration
     {
         /// <inheritdoc />

src/Bifrost.Web/Data/Migrations/20260705190000_AddPatronSupportProjectAttribution.cs

@@ -1,4 +1,5 @@
 using System;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -6,6 +7,8 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace Bifrost.Web.Data.Migrations
 {
     /// <inheritdoc />
+    [DbContext(typeof(BifrostDbContext))]
+    [Migration("20260705190000_AddPatronSupportProjectAttribution")]
     public partial class AddPatronSupportProjectAttribution : Migration
     {
         /// <inheritdoc />

tests/Bifrost.Web.Tests/MigrationDiscoveryTests.cs

@@ -0,0 +1,56 @@
+using Bifrost.Web.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Bifrost.Web.Tests;
+
+public sealed class MigrationDiscoveryTests
+{
+    private static readonly string[] ExpectedMigrations =
+    [
+        "20260422084653_InitialAlphaFoundation",
+        "20260608210000_AddHeimdallUserIdentity",
+        "20260609143000_AddPatronSupportDerivation",
+        "20260609160000_AddExternalPatronProviderIntake",
+        "20260617010537_AddBridgeActionLedger",
+        "20260617022305_AddAgentDispatchRuns",
+        "20260617033635_AddAgentTransportReceipts",
+        "20260617041417_AddGovernanceActivityReceipts",
+        "20260622142000_AddBridgeActionIdentityProvenance",
+        "20260622165000_AddBifrostNativeIdentity",
+        "20260622202000_AddBridgeActionTargetSurfaceName",
+        "20260705190000_AddPatronSupportProjectAttribution",
+    ];
+
+    // Database.GetMigrations() reads assembly metadata only; no connection is opened.
+    private static List<string> Discovered()
+    {
+        var options = new DbContextOptionsBuilder<BifrostDbContext>()
+            .UseNpgsql("Host=unused")
+            .Options;
+        using var db = new BifrostDbContext(options);
+        return db.Database.GetMigrations().ToList();
+    }
+
+    [Fact]
+    public void Every_migration_type_is_discovered()
+    {
+        var discovered = Discovered();
+        var declared = typeof(BifrostDbContext).Assembly.GetTypes()
+            .Where(t => !t.IsAbstract && typeof(Migration).IsAssignableFrom(t))
+            .ToList();
+
+        Assert.NotEmpty(declared);
+        Assert.Equal(declared.Count, discovered.Count);
+        foreach (var type in declared)
+        {
+            Assert.Contains(discovered, id => id.EndsWith("_" + type.Name, StringComparison.Ordinal));
+        }
+    }
+
+    [Fact]
+    public void All_twelve_migrations_are_listed_in_order()
+    {
+        Assert.Equal(ExpectedMigrations, Discovered());
+    }
+}