docs: document fee sponsorship signing hash behavior#72
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Adds documentation explaining that when building sponsored transactions, the sender must indicate sponsorship BEFORE signing because the signing hash differs: - Sponsored: fee_token omitted from signing payload, 0x00 marker used - Non-sponsored: fee_token included in signing payload This was raised as feedback from an external integration partner who discovered this behavior during testing. Changes: - Added warning callout in Go SDK docs - Added 'Signing Hash Behavior' section in sponsor-user-fees guide
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- Add build step after typecheck in CI to catch build failures before deploy - Change checkDeadlinks to 'warn' (TIP-1011 has dead link in tempo repo)
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Summary
Documents an important design choice in fee sponsorship: the sender must indicate sponsorship before signing because the signing hash differs based on whether a transaction will be sponsored.