Fixes a bug where outer iteration chaining was lost when nested loops
were expanded. The problem was:
1. chainLoopIterations set: outer.iter2.inner depends on outer.iter1.inner
2. ApplyLoops recursively expanded nested loops
3. outer.iter2.inner became outer.iter2.inner.iter1.work, etc.
4. The dependency was lost (referenced non-existent ID)
The fix:
- Move recursive ApplyLoops BEFORE chaining
- Add chainExpandedIterations that finds iteration boundaries by ID prefix
- Works with variable step counts per iteration (nested loops expand differently)
Now outer.iter2's first step correctly depends on outer.iter1's LAST step,
ensuring sequential execution of outer iterations.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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