- Random port via net.Listen(":0") replaces hardcoded 33310 (was the
primary failure mode under parallel test load).
- Bump waitForPort deadline 5s → 30s — `go build` under -race can exceed
5s on a loaded machine.
- Replace osPath() (always returned empty PATH because exec.Command("env").Env
is the *child's* env, not the parent's) with explicit PATH+HOME via
os.Getenv. Don't inherit full env: would leak ROUTING_MCP_TOKEN from the
parent shell and flip the routing pod into auth-required mode, breaking
the test.
Closes#15. Verified: 10 cold-cache test runs pass, 3 consecutive task check
runs pass.
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