Mock HTTP backend. Refuses non-allowed hosts. Returns stubbed responses
registered per-node via stub/3.
Test/dev backend (the default). Its stub registry is an Agent started lazily
on first use and is NOT part of any supervision tree — fine for tests, not a
production process. Use Bloccs.Effects.HTTP.Req in production.
Summary
Functions
Build the capability struct from a [effects].http declaration.
Clear all stubs. Test-only.
Register a stub response for a method + URL pattern. URL match is a literal string match for v0.1.