Drives DockerCredProxy.start through the production code path against
a fake upstream container running on the same egress network. The
"agent" is a curl container on the bottle's internal network — same
access topology the agent uses in production.
Covers PRD 0010 success criteria:
- SC3 (the request reaches upstream, header round-trip works)
- SC6 (inbound Authorization stripped; the proxy injects the
configured token even when the agent tries to smuggle one in)
- partial SC2 (cred-proxy reachable by the alias from the internal
network)
- 404 for unconfigured routes
Live-network tests against real Anthropic / GitHub / Gitea / npm
upstreams (SC4 and SC5 specifically) are deferred — the fake-upstream
shape covers the routing + header layer that's actually under test
here.
didericis
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