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Owner decision: this is a service business that uses materials to deliver a service rather than selling inventory, so powder/consumables are expensed at purchase (bill to a COGS/expense account) and inventory is not capitalized on the Balance Sheet. No code change required — the Balance Sheet already behaves this way, and the perpetual consumption-COGS path (O6) is opt-in via item account mappings (set only via CSV import) and stays dormant under this policy. Documents the double-count footgun (do not both expense at purchase and map item COGS/Inventory accounts) and locks the periodic choice into the ledger-refactor plan's Phase 5. All accounting audit findings O1-O9 now resolved. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>