fix(cv): gate AI proposals on grounding and source freshness

JobTrackerApi.Tests/MeteredSummarizerServiceTests.cs

@@ -52,6 +52,37 @@ public sealed class MeteredSummarizerServiceTests
         Assert.Equal(1, fixture.Handler.RequestCount);
     }
 
+    [Fact]
+    public async Task Cv_factual_review_is_admitted_and_finalized_by_the_shared_usage_gate()
+    {
+        await using var fixture = await Fixture.CreateAsync("{\"assessment\":{\"verdict\":\"unknown\",\"coverageComplete\":false,\"claims\":[]}}");
+        var result = await fixture.Service.EvaluateCvRewriteAsync("Built APIs.", "Developed APIs.", "Requires SQL.");
+
+        Assert.NotNull(result);
+        var usage = Assert.Single(await fixture.Db.AiUsageRecords.AsNoTracking().ToListAsync());
+        Assert.Equal("synchronous.cv-factual-review", usage.TaskType);
+        Assert.Equal("Built APIs.\nDeveloped APIs.\nRequires SQL.".Length, usage.InputCharacterCount);
+        Assert.Equal(result.Text.Length, usage.OutputCharacterCount);
+        Assert.Equal(1, fixture.Handler.RequestCount);
+    }
+
+    [Fact]
+    public async Task Exhausted_limit_rejects_cv_factual_review_before_provider_call()
+    {
+        await using var fixture = await Fixture.CreateAsync("{\"assessment\":{}}");
+        fixture.Db.AiUsageRecords.Add(new AiUsageRecord
+        {
+            OwnerUserId = "owner", SourceType = "synthetic", SourceId = "review-limit", TaskType = "synthetic",
+            CallCount = 250, EstimatedTokenCount = 1, CreatedAtUtc = DateTimeOffset.UtcNow,
+        });
+        await fixture.Db.SaveChangesAsync();
+
+        var error = await Assert.ThrowsAsync<AiUsageLimitException>(() => fixture.Service.EvaluateCvRewriteAsync("Built APIs.", "Developed APIs.", null));
+
+        Assert.Equal("monthly_ai_calls_exhausted", error.Code);
+        Assert.Equal(0, fixture.Handler.RequestCount);
+    }
+
     [Fact]
     public async Task Exhausted_limit_rejects_before_provider_call()
     {