Enables loops within loop bodies to be properly expanded:
- Copy Loop field in expandLoopIteration (was intentionally omitted)
- Add cloneLoopSpec for deep copying of LoopSpec with body steps
- Recursively call ApplyLoops at end of expandLoop to expand nested loops
- Also copy OnComplete field for consistency
Nested IDs follow natural chaining pattern:
outer.iter1.inner.iter2.step
Tested with 2-level and 3-level nesting scenarios.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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