Add support for "phantom" BOLT 12 offers, up to the invoice_request step#4335

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TheBlueMatt wants to merge 9 commits intolightningdevkit:mainfrom

TheBlueMatt:2025-01-phantom-bolt12

Commits on Jan 22, 2026

Fix 0.2 CHANGELOG to note that offers will break on downgrade
TheBlueMatt
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Add an `ExpandedKey` key for phantom blinded path authentication
TheBlueMatt
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Accept blinded paths built by a phantom node participant
TheBlueMatt
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Commits on Jan 27, 2026

f add docs on channel_details_to_forward_nodes
TheBlueMatt
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