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feat: Construct::TightInsertion, soft bounds held hard while constructing - #29
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…ting The priced greedy overloads a route early wherever one unit of excess is cheaper than a detour, and the descent does not always unload it. With soft bounds held hard until a node fits nowhere under them, the first solution pays no penalty when a penalty-free one is reachable. Opt-in: it suits overload-style softness (softcap lands on or under the open solve) and hurts window-style, where a single-customer route always meets a soft close and construction opens routes it need not. `bench --scenario=... --tight` runs a scenario from it.
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Stacked on #28. Opt-in, default behaviour unchanged.
What
Construct::TightInsertion { seed, k }: cheapest insertion with every soft bound treated as hard for as long as every unrouted node still fits under them. Once a node fits nowhere tightly, construction loosens and stays loose. The first solution pays no penalty when a penalty-free one is reachable.bench --scenario=softcap --tightruns a scenario from it.Why opt-in
The priced greedy overloads a route early wherever one unit of excess is cheaper than a detour, and the descent does not always unload it (X-n106 sat 5% above the open solve on #28). Tight construction fixes that shape but hurts the other one.
Measured on X-n1xx, tight vs priced construction:
X-n106 softcap lands exactly on open, X-n195 2393 under it. Softtw regresses because a single-customer route always meets a soft close, so tight construction opens extra routes instead of buying a cheap late slot.
Tests
tests/soft.rs: tight construction is penalty-free where the priced greedy overloads, and still routes a node that can never meet its soft bound.