Fix router-backtrack cases in last-hop hints#3586

Merged

valentinewallace merged 10 commits intolightningdevkit:mainfrom

TheBlueMatt:2025-02-router-fixes

Feb 13, 2025

Commits on Feb 3, 2025

Commits on Feb 13, 2025

Prefer higher-value, shorter equal-cost paths when routing
TheBlueMatt
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Move last-hop route handling to the common "normal" hop codepath
TheBlueMatt
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Add direct hops to intros after all blinded paths in pathfinding
TheBlueMatt
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Add `PathBuildingHop::best_path_from_hop_selected`
TheBlueMatt
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Replace a few router `expect`s with `debug_assert` + `Err`-returns
TheBlueMatt
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More completely ignore route hints which are for our own channels
TheBlueMatt
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Stop wrapping router errors in `LightningError`
TheBlueMatt
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