The strict-denial pin only asserted a 401, so any unrelated 401 (a bad key, a deleted key) would have kept it green while tag routing silently broke. The harness now keeps the 401 response body, the way it already does for 429s, and the pin asserts the tag-routing denial message.
Key and team router_settings set enable_tag_filtering on the request kwargs,
and get_deployments_for_tag already treats that as authoritative, but
_select_pre_routing_strategy only consulted the router-wide flag, so tagged
auto-router markers still captured untagged requests from keys that enabled
filtering. The e2e auto-router module now enables tag filtering through
key-level router_settings instead of flipping /config/update module-wide,
which was denying concurrently running tagged requests from other suites on
the shared per-build CI proxy.
