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Narrow the allowed-methods routes by static path and bucket (#3070)

An auto-OPTIONS, a 405 and a 404 for a method other than GET each look
for the allowed-methods route of the path, and did so by walking a union
of every such route: the whole of them for OPTIONS and for a method with
no routes of its own, and the ones the method has no route on otherwise.
A request for a method the path does answer has not walked its routes
that way since the static table and the route buckets.

The allowed-methods routes are now looked up the same way: a table of
the paths they spell out in full, then buckets by a literal segment,
then the union. A method's neighbours share the table and get buckets of
their own.

Co-authored-by: Claude Fable 5.2 <noreply@anthropic.com>

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