No recursion depth protection in EXECUTE SCRIPT (infinite loop)

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Description

A script that calls EXECUTE SCRIPT on itself recurses infinitely until the process is killed.

Steps to Reproduce

Create loop.mdl containing execute script 'loop.mdl'; then:

./mxcli -p project.mpr -c "execute script 'loop.mdl'"

Expected

Error after max depth reached (e.g., "maximum script nesting depth exceeded")

Actual

Infinite recursion until process killed or stack overflow

Severity

Low

Test Case Reference

session-test-cases.md §11.6

[retran]

Duplicate of #472 (more detailed report)