Two cases:
- root/notes -> root (single-link cycle through workspace root).
- root/a -> b, root/b -> a (two-step cycle of dangling symlinks).
Both must complete in O(seconds) and surface alpha.md exactly once.
Proves walker::walk_files's visited-set guard catches realistic cycle
shapes via the public SourceConnector API.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
altair823
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