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Adds the anchors the sync-diagnostics signals attach to, with no signals emitted yet: - New "Ledger Sync Health" dashboard (uid ledger-sync-health) with the standard template-variable block copied from an existing board, plus empty "Bootstrap (Domain 0)" and "Sync pipeline" rows. - Signal index section in the data-collection reference, an operator-flow stub in the telemetry runbook, and a glossary anchor. - A sync_diagnostics group in expected_metrics.json and a matching assertion helper in validate_telemetry.py so CI fails when a signal regresses to absent. Also registers the new dashboard uid with the harness so the board is covered by validation. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>