Critical bug fixes identified during code review:
1. External dependency rewriting: Dependencies on steps OUTSIDE the loop
are now preserved as-is instead of being incorrectly prefixed.
2. Children dependency rewriting: Child step dependencies are now properly
rewritten with iteration context.
3. Missing fields: Added Expand, ExpandVars, Gate fields to loop expansion.
4. Condition validation: Loop `until` conditions are now validated with
ParseCondition to catch syntax errors early.
5. Label format: Changed gate and loop labels from colon-delimited to
JSON format for unambiguous parsing:
- gate:{"condition":"expr"}
- loop:{"until":"expr","max":N}
Added TestApplyLoops_ExternalDependencies to verify the fix.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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