Maps a raw ingest request (Plug.Conn) to a Ankusa.Route. This is the seam that makes the catch-URL scheme pluggable, so the framework fits a single static server, a multi-tenant SaaS handing every customer their own path, or a product minting opaque catch URLs of its own shape at runtime — without touching the hot path.

This module is both the behaviour every resolver implements and the instance-scoped facade (resolves config.route_resolver and delegates).

A resolver does URL-scheme work only. It never reads the body, verifies signatures, or touches storage: it answers "which endpoint is this?" and hands back a Ankusa.Route. Policy (verify/sinks) still comes from the Ankusa.SourceStore keyed by the returned source_id.