docs: record the references/ analysis and reverse its recommendation

I first read winvm's dead-link finding as "add references/ to the rsync". Looking at what the directory holds reversed it. It has one file, protocols.org:273 is its only citation in the tree, and the four calendar workflows already sync and already carry the operational detail those recipes exist for. What the reference uniquely adds is credential file locations, which matter during a re-auth I do myself.

So a new synced directory carrying --delete semantics, to deliver one mostly-redundant file, is a poor trade. Pinned for Craig's decision with all three options written out.

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