No CHANGELOG.md tracking behavior changes across already-landed fixes

[chonilius]

Several closed issues represent real, user-visible behavior changes to deployed-or-deployable contracts: #55 (dust-distribution algorithm), #56 (TTL scaling for far-future deadlines), #57/#58 (crowdfunding support added to escrow and milestones), #60 (internal extend_ttl/require_admin deduplication). None of this is captured in a CHANGELOG.md — anyone integrating against these contracts (starting with mergefi-backend) has to reconstruct what changed and when from git/issue history rather than reading a single chronological summary. Worth starting one now, even retroactively for the changes already listed above, given how much has already shipped at version = "0.1.0" with no per-change record.

[iorchirmyom-afk]

@iorchirmyom-afk has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, I’ve carefully reviewed the issue and understand the requirements and acceptance criteria. I’m confident I can implement a clean and effective solution. Kindly assign it to me. Thank you.

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[cristianooR7]

@cristianooR7 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello miantainer, i would like to work on this

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