[client] Add chain tip query method to `getdeploymentinfo` RPC#480

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natobritto wants to merge 2 commits intorust-bitcoin:masterfrom

natobritto:fix-getdeploymentinfo

Commits on Jan 23, 2026

feat(client): add `getdeploymentinfo` chain tip query method
natobritto
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Commits on Jan 26, 2026

test(blockchain): test getdeploymentinfo tip query method
natobritto
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