Add standalone Bash incident check scripts

infra-run/scripts/bash/incident-checks/examples/jvm-threads-heap.sample.txt

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+OK: JVM diagnostics collected for PID 1234
+
+Detected JVM process:
+PID USER RSS_MB CPU COMMAND
+1234 app 2048 42.1 java -Xms2g -Xmx2g -jar order-api.jar
+Thread count: 188
+
+Heap and JVM evidence:
+
+[jcmd VM.flags]
+1234:
+-XX:InitialHeapSize=2147483648 -XX:MaxHeapSize=2147483648
+
+[jcmd GC.heap_info]
+garbage-first heap total 2097152K, used 1521000K
+
+[jcmd Thread.print summary]
+102 java.lang.Thread.State: WAITING
+53 java.lang.Thread.State: RUNNABLE
+33 java.lang.Thread.State: TIMED_WAITING
+
+Evidence:
+PID=1234 thread_count=188 top=10
+
+Recommended next steps:
+- Review GC logs and recent application errors
+- Check JVM heap sizing against container or host memory limits
+- Check thread count trend in monitoring before concluding a leak
+- Capture jstack only if approved by operational process
+- Attach this output to incident ticket