* test(qa): canonicalize channel routing scenarios
* test(qa): enforce Crabline actor allowlists
* test(qa): preserve canonical flow integration
* test(matrix): use retained topology fixture id
* test(qa): preserve WhatsApp live defaults
* QA: declare channel transport policy in scenarios
* refactor(qa): keep transport policy type local
* refactor(qa): keep transport policy on leaf contract
* test(matrix): use retained routing fixture
Drop the generated qa-runner catalog and the missing/install placeholder
path for repo-private QA runners. The host should discover bundled QA
commands from manifest plus runtime surface only.
Also trim stale qa-matrix install docs and package metadata so the
source-only QA policy stays consistent.