Two latent bugs the self-hosted Mac mini had been hiding. Both caught
by the newer toolchain on ubuntu-latest runners after PR #1626.
1. workspace-server/internal/handlers/terminal.go:442
`fmt.Sprintf("%s:%d", host, port)` flagged by go vet as unsafe
for IPv6 (it omits the required [::] brackets). Replaced with
`net.JoinHostPort(host, strconv.Itoa(port))` which handles both
IPv4 and IPv6 correctly. No runtime behaviour change — the only
call site passes "127.0.0.1", so the bug would never trigger in
practice, but vet is right to flag it as a latent correctness
issue.
2. workspace/tests/test_a2a_executor.py::test_set_current_task_updates_heartbeat
`MagicMock()` auto-creates attributes on first access, so
`getattr(heartbeat, "active_tasks", 0)` in shared_runtime.py
returned a MagicMock rather than the default 0. Adding 1 to a
MagicMock returns another MagicMock, so the assertion
`heartbeat.active_tasks == 1` never held. Seeding
`heartbeat.active_tasks = 0` before the first call makes
getattr() return a real int, matching how the real HeartbeatLoop
class initialises itself.
Both pre-existed on main and were hidden by the older Python / Go
toolchains on the Mac mini runner. Verified locally (venv pytest
pass, `go vet ./...` + `go build ./...` clean on workspace-server).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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