docs: establish the constellation Git baseline

Condense the working handoff into implemented state, activation evidence and open choices. Record both repositories, flag superseded SharePoint setup instructions and undocumented input/support changes, and align the design with completed workbench organization.

Keep the generated nvim.log locally but ignore it. Both flakes evaluated successfully and whitespace checks passed. No implementation behavior changes, tests, builds, activation or remote writes.

docs/.archive/sharepoint-reference.md

@@ -2,6 +2,11 @@
 
 Archived: guidance for the existing implementation, not a new design decision.
 
+Superseded: this describes the earlier single-source, environment-file-gated
+implementation. The current [working state](../constellation-work.md) records two
+fixed library mirrors gated only by the presence of `rclone.conf`. Do not use the
+setup procedure below as current operational guidance.
+
 The Zenith user timer mirrors one selected company SharePoint document library
 into `~/.local/share/yookr-reference/sharepoint` hourly. SharePoint is
 authoritative: remote updates overwrite local files and remote deletions remove