Sentinel Recovery payment-boundary preflights

Local read-only stdio MCP server that deterministically checks inline agent-payment documents and decoded x402 v2 `PaymentRequired` JSON under pinned exact-EVM EIP-3009 rules. The preflight tools make no network requests, access no wallet, and perform no signing, settlement, payment, or receipt verification. Install from verified source or the checksummed v0.3.0 MCPB release; official [MCP Registry record](https://registry.modelcontextprotocol.io/v0.1/servers/io.github.TerminallyLazy%2Fsentinel-recovery-services/versions/0.3.0).

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