fix(ci): bound e2e command timeouts

[Scetrov]

Summary

• give the full E2E suite a 30-minute budget and the CI job a 35-minute hard limit
• bound individual efctl commands with contexts, preserving time for lifecycle cleanup
• add a 50ms regression test for command cancellation

Validation

• go test -count=1 ./...
• go test -v -count=1 -tags e2e -run '^(TestRunCommandTimeout|TestE2E_VersionOnly)$' ./tests/e2e/...
• pre-commit run --all-files

The full Docker-backed lifecycle test could not run locally because the local Docker command is a Podman shim without storage permissions.