Address recurring review feedback on the docker reconnect path:
- reconnectToContainer was 98 lines (over the 80-line repo limit). Split
into ensureContainerRunning (inspect + start + re-inspect) and
bringupAgentctl (health-check, find-or-create instance, transparent
re-handshake). The orchestration body now reads top-down at 49 lines.
- resolveDockerEndpoint and waitForAgentctlHealth grew real branches in
this PR (host-port lookup with container-IP fallback; 240×500ms
retry loop) but had no direct tests. Introduce narrow hostPortLookup
/ healthChecker interfaces, satisfied by *docker.Client and
*agentctl.ControlClient, so both functions are now driven by stubs
that exercise happy-path, fallback, retry-until-healthy, exhaustion,
and context-cancellation branches.
- Add direct unit tests for the docker package's pure helpers
(normalizeDockerHostIP, buildDockerPortBindings) and for
dockerAgentctlPortBindings — a regression in the published port
range or host IP would silently break container reconnect.
José Almeida