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>
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