[AZ-576] Add e2e test infrastructure (xUnit + jwks-mock + reporting)

Scaffold the blackbox test project the rest of epic AZ-575 (AZ-577..AZ-586)
will build on. Two new csprojs under tests/, plus the TLS materials and
TRX->CSV reporting hand-off the existing docker-compose.test.yml already
calls for.

JWKS mock (tests/Azaion.Missions.JwksMock/):
- ASP.NET Core minimal API on .NET 10, no NuGet deps; JWS is hand-rolled
  to keep the surface tight and avoid version drift with the SUT
- KeyStore with one in-memory ECDSA P-256 keypair + retired-key grace
  window for NFT-RES-07 / NFT-SEC-11 rotation observability
- Endpoints: GET /.well-known/jwks.json, POST /sign, POST /rotate-key
- Mock-only alg_override / kid_override switches drive NFT-SEC-09/10/11
- TLS keypair committed under tls/; tests/jwks-mock-ca.crt is a copy
  mounted into both missions and e2e-consumer per docker-compose.test.yml

E2E consumer (tests/Azaion.Missions.E2E.Tests/):
- xUnit 2.9.2 + Bogus 35.6.1 + Npgsql 10.0.2 + Xunit.SkippableFact 1.4.13
- TestBase / TokenMinter scaffolding for downstream tasks
- Fixtures/ for DbReset, DbSeed, ComposeRestart, JwksRotate, JwksMockReverse
- Helpers/ for DbAssertions (side-channel), HttpAssertions, FixtureSql
- 8 Tests/<category>/Sanity.cs discovery smoke tests (AC-3)
- Tests/InfrastructureSanity.cs SkippableFacts for AC-1/2/5/6
- Tests/AaaPatternEnforcement.cs greps source files for AC-7
- Tests/Reporting/TrxToCsvPostProcessorTests.cs covers AC-4
- Reporting/TrxToCsvPostProcessor.cs handles VSTest TRX -> environment.md
  CSV; xUnit traits are not propagated by the TRX logger so the converter
  reflects them out of the test DLL via GetCustomAttributesData
- Reporting.Cli/ is a separate console csproj that links the converter
  source files (test project excludes Reporting.Cli/** from compile)
- Dockerfile + entrypoint.sh wire dotnet test -> trx -> csv inside the
  e2e-consumer container the compose file already references

Local verification: 13 pass, 3 skip (with explicit reasons), 0 fail.
End-to-end TRX->CSV manually verified against environment.md header spec.
Docker stack build is handed off to autodev Step 7 (test-run skill).

Reports under _docs/03_implementation/.
AZ-576 task spec moved to _docs/tasks/done/.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Azaion.Missions.E2E.Tests/Helpers/DbAssertions.cs

@@ -0,0 +1,54 @@
+using Npgsql;
+using Xunit;
+
+namespace Azaion.Missions.E2E.Helpers;
+
+/// <summary>
+/// Side-channel database assertions. Used to verify state the API does not
+/// expose directly (default-vehicle invariants, mission row counts after
+/// cascade-delete, audit-table side effects).
+/// </summary>
+/// <remarks>
+/// Marked with <c>[Trait("db_access","seed-or-assert-only")]</c> at the
+/// consumer-test level — this helper itself is a pure utility.
+/// </remarks>
+public static class DbAssertions
+{
+    public static long ScalarCount(string sql, params (string Name, object Value)[] parameters)
+    {
+        using var conn = new NpgsqlConnection(TestEnvironment.DbSideChannel);
+        conn.Open();
+        using var cmd = conn.CreateCommand();
+        cmd.CommandText = sql;
+        foreach (var (name, value) in parameters)
+            cmd.Parameters.AddWithValue(name, value);
+        var result = cmd.ExecuteScalar();
+        if (result is null || result is DBNull)
+            throw new InvalidOperationException($"Scalar query '{sql}' returned NULL");
+        return Convert.ToInt64(result, System.Globalization.CultureInfo.InvariantCulture);
+    }
+
+    public static void AssertExactlyOneDefaultVehicle()
+    {
+        var count = ScalarCount("SELECT COUNT(*) FROM vehicles WHERE is_default = TRUE");
+        Assert.True(count <= 1, $"default-vehicle invariant violated: {count} vehicles flagged is_default=TRUE");
+    }
+
+    public static long TableRowCount(string table)
+    {
+        if (!IsValidIdentifier(table))
+            throw new ArgumentException($"Invalid table identifier '{table}'", nameof(table));
+        return ScalarCount($"SELECT COUNT(*) FROM {table}");
+    }
+
+    private static bool IsValidIdentifier(string s)
+    {
+        if (string.IsNullOrEmpty(s) || s.Length > 63) return false;
+        foreach (var c in s)
+        {
+            if (!(char.IsLetterOrDigit(c) || c == '_'))
+                return false;
+        }
+        return true;
+    }
+}