1. Add //go:build !cgo to control_host_test.go so the stub-testing
tests only run in non-CGO builds, matching the stub.go build
constraint. Clean up dead nil check in SignatureCompiles test.
2. Replace two independent if-statements for actionType mapping in
ControlHost with a map lookup + explicit guard, consistent with
ControlQueue's ActionMap pattern. Prevents silent zero-value
actionType if SupportedHostActions expands later.
- backend/clib.go: Replace ControlHost stub with real implementation
using xcecli_hostctrl, following the same pattern as ControlQueue
- controllers/hosts.go: Remove package-level allFlag variable;
preCheckHostControlRequest now returns (bool, error) so the allFlag
is a local value in the caller, eliminating the data race
- controllers/queues.go: Same fix for preCheckQueueControlRequest
- Add unit tests for both preCheck functions verifying return values,
error cases, and concurrent safety
- Add compile-time verification test for ControlHost stub signature
