Add transcript line workflow rules

MeetingAssistant.Tests/WorkflowRulesEditorTests.cs

@@ -612,6 +612,36 @@ public sealed class WorkflowRulesEditorTests
         Assert.Equal("rules: []", await File.ReadAllTextAsync(rulesPath));
     }
 
+    [Fact]
+    public async Task RulesEditorToolsRefuseTranscriptLinePropertyOutsideTranscriptLineTrigger()
+    {
+        var root = Path.Combine(Path.GetTempPath(), "meeting-assistant-tests", Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(root);
+        var rulesPath = Path.Combine(root, "rules.yaml");
+        await File.WriteAllTextAsync(rulesPath, "rules: []");
+        var tools = new WorkflowRulesEditorTools(new MeetingAssistantOptions
+        {
+            Automation = new AutomationOptions { RulesPath = rulesPath }
+        });
+
+        var result = await tools.WriteRules("""
+            rules:
+            - name: broken-transcript-property
+              on:
+                - created: {}
+              steps:
+                - uses: set_property
+                  property: transcript.line
+                  value: redacted
+            """, replace_file: true);
+
+        Assert.StartsWith("Refused: workflow rules are invalid.", result);
+        Assert.Contains("broken-transcript-property", result);
+        Assert.Contains("transcript.line", result);
+        Assert.Contains("transcript_line", result);
+        Assert.Equal("rules: []", await File.ReadAllTextAsync(rulesPath));
+    }
+
     [Fact]
     public async Task RulesEditorToolsRefuseMalformedRazorStepValues()
     {