Askrene parallel solving support#8723

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rustyrussell wants to merge 18 commits intoElementsProject:masterfrom

rustyrussell:guilt/askrene-parallel

Commits on Dec 5, 2025

askrene: move routines only accessed by the child process into child/.
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askrene: move fmt_flow_full from askrene.c into flow.c.
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askrene: move fork() entry point into its own file.
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askrene: make children use child_log() instead of rq_log.
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askrene: remove non child-friendly fields from struct route_query.
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askrene: expose additional_costs htable so child can access it.
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askrene: move route_query definition and functions into child/.
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askrene: have child make `struct route_query` internally.
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askrene: actually run children in parallel.
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askrene: limit how many children we have.
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askrene: make "child.c" to be the explicit child entry point.
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askrene: close files in child to isolate against bugs.
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pytest: rework test_real_data and test_real_biases to be parallel.
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