Add e2e solana example#37

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Woody4618 wants to merge 7 commits intoagentcommercekit:mainfrom

Woody4618:add-e2e-solana-example

Commits on Sep 29, 2025

Commits on Sep 30, 2025

Add docs for on-chain payments
Woody4618
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Commits on Oct 13, 2025

Use kit + code review
Woody4618
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Commits on Oct 14, 2025

Code review
Woody4618
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Commits on Oct 15, 2025

Remove Memo instruction
Woody4618
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