Scan enumerates a file twice when a directory symlink inside MediaRoot aliases another directory (ghost discovered row)

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🔗 What

ScanService walks Library:MediaRoot with Directory.EnumerateFiles(root, …, RecurseSubdirectories = true). When the root contains a directory symlink that points at another directory under the same root (root/link → root/inner), every file under inner/ is yielded twice — once as root/link/x.mp3, once as root/inner/x.mp3. The catalog's identity is the path, so the second path is classified discovered and becomes a ghost row of the same physical file (the gh-#610 shape, one file at a time).

Found 2026-08-30 while proving F154.6 for T380 (the Gardener's file actions): a move into root/link left the row at the link path and the next tick reported 1 discovered. The planner now refuses moves into symlinked directories (FileActionRule.SymlinkedTarget), but the scan itself still double-counts any pre-existing alias.

🛠️ Options

1. Enumerate with AttributesToSkip |= ReparsePoint (skip directory symlinks entirely — simplest; an aliased tree is then reachable only by its real path).
2. Resolve each yielded path with ResolveLinkTarget(returnFinalTarget: true) and dedupe on the real path (keeps link-only layouts working; costs a stat per file).
3. Document "no internal symlink aliases under MediaRoot" in DEPLOYMENT and leave the scan alone.

Fact pinning the current truth: Story379_FileActionExecutors.cs (AScanTickAfterTheSymlinkedMoveDiscoversAGhostDuplicateOfTheSamePhysicalFile).

https://claude.ai/code/session_01AmM47neuvsJph3ZT4brTCV