Gideon Bature

**What's wrong?** Please put a clear and concise description of what the bug is. under placeholders for the clock, it was stated that `{yy}` is for the `long year (i.e....

Update declare-a-smart-contract.adoc: fix minor typo in StarkScan link change the sub-domain from `testnet` to `sepolia`.

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### Description of the Changes on line 154, I corrected the url to the StarkScan, from `https://testnet.starkscan.co` to `https://sepolia.starkscan.co`. The one with the `testnet` sub-domain is no longer working, hence,...

fix a typing/word error, changed spend to send!

Enforce content-length validation on sender and size limits on payjoin-cli

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This PR follows up on #770 and addresses the remaining improvements in [comment](https://github.com/payjoin/rust-payjoin/pull/770#issuecomment-3000712651). It implements stricter content-length validation and removes `MAX_CONTENT_LENGTH` from the sender side, moving it to `payjoin-cli`. ###...