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Valid x402 manifest with 492 payment rails exposed D1 SQL limit; preflight checks can catch it

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A merchant's x402 manifest can pass structural validation yet still fail when a registry tries to import it, so the importer may be the real problem. A public report from open-x402-bazaar described a manifest with 123 resources and 492 payment entries that triggered a D1_ERROR for too many SQL variables. The prior replacement flow also risked deleting the existing listing before the new one was saved. The author built ManifestScope, a free browser-local checker, and an offline CLI with a GitHub Action for merchant repositories to run structural preflight checks. Proposed open-source fix PR #6 uses parameterized queries to address the import problem.

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