Bridge Coach memory brief with project metrics summaries.

Add Performance Summary block to memory brief, document metrics synthesis in
agent-coach, and add e2e and CLI tests for qualitative plus quantitative briefs.

tests/test_e2e_agency_framework.py

@@ -209,6 +209,49 @@ class TestMemoryBrief:
         # Raw mode should not include the orientation header
         assert "Orientation Brief for:" not in result.output
 
+    def test_brief_includes_performance_summary_with_memory_and_metrics(self, project):
+        self._populate(project)
+        runner = CliRunner()
+        runner.invoke(
+            cli,
+            [
+                "metrics",
+                "record",
+                "sys-medic",
+                "--target",
+                str(project),
+                "--success",
+                "--time",
+                "30",
+                "--quality",
+                "0.88",
+            ],
+        )
+        runner.invoke(
+            cli,
+            [
+                "metrics",
+                "record",
+                "project-management",
+                "--target",
+                str(project),
+                "--success",
+                "--time",
+                "15",
+                "--quality",
+                "0.95",
+            ],
+        )
+
+        result = runner.invoke(cli, ["memory", "brief", "sys-medic", "--target", str(project)])
+
+        assert result.exit_code == 0
+        assert "## Performance Summary" in result.output
+        assert "Success rate:" in result.output
+        assert "tegpi-01" in result.output
+        assert "Context From Other Agents" in result.output
+        assert "project-management" in result.output
+
 
 class TestMemoryClear:
     def test_clear_removes_file(self, project):