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Detect recursive subtree cycles at parse time (fixes #979)#1085
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Use an ancestor set passed through recursivelyCreateSubtree to detect cycles, avoiding the substring-matching false positives of a prefix path check. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Avoids copying the set at each recursive call. Uses insert-on-entry and erase-on-exit (DFS backtracking) so sibling subtrees sharing the same ID are handled correctly. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Replaces #980