feat(route): measured-promotion gate + outcome-calibrated routing #155

Job	Run time
Assert zero runtime dependencies	8s
Version fields agree	6s
ShellCheck	7s
Test (Node 20)	20s
Docs match code	8s
Dependency review	4s
Lint & format (Biome)	16s
Test (Node 22)	17s
	1m 26s

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