docs: sister-repo index update + working notes
CLAUDE.md: the historian SDK is now owned inside HistorianGateway at histsdk/ (the separate ~/Desktop/histsdk repo was folded in with history), so the sister-project list no longer points at a standalone repo. Also checks in working notes that were sitting untracked in the tree: deferred.md (remaining deferred work snapshot), ScadaBridge-docs-fixed.md and ScadaBridge-docs-issues.md (documentation-analysis report output).
This commit was merged in pull request #19.
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