fix(blog): stop triage diagram edge from overlapping the confirmed box

In the Stage 2 triage flowchart, the diag->rule edge clipped the
Confirmed vulnerability box because confirmed and diag shared a rank and
the fan-out had to route through confirmed's row. Add an invisible
diag ~~~ confirmed link to lift confirmed into the terminal column,
clearing the edge path.

Author: misonijnik

src/content/blog/appsec-agent.mdx

@@ -132,6 +132,7 @@ Once the scan completes, every finding goes to the agent for triage: it reads th
     diag --> rule
     diag --> approx
     diag --> engine
+    diag ~~~ confirmed
 
     style triage fill:#fef3c7,stroke:#f59e0b,color:#92400e
     style poc fill:#fef3c7,stroke:#f59e0b,color:#92400e