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docs(billing): session handoff — core on main, sub-project #2 (NexaCloud) next Captures resume state for the centralized-billing initiative: core engine done and on main, the 4-chunk decomposition of sub-project #2 (NexaCloud adapter + dual-run reconciliation), the pending "where to start" decision, open questions, and the test/branch workflow. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> @