feat(x402): support upto scheme + observability + session marker#238

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Commits on May 21, 2026

fix(x402): honor schemePreference on proactive sign and tool-result retry paths
MQ37
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docs(x402): document upto scheme, session preferences and flags in README
MQ37
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fix(x402): preserve schemePreference on automatic bridge failover
MQ37
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fix(x402): type-declare schemePreference on bulk-connect options; drop dead conditional in upto signer
MQ37
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refactor(x402)!: collapse --x402-scheme into --x402 [auto|upto|exact]
MQ37
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fix(cli): use ClientError for CLI validation so users see a clean message
MQ37
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