add time logging

[resowifix]

This is an attempt to address issue #247.
This is a little bit "hand-crafted", but it seems to do the basic job.
I don't know if it is sufficient, or if someone knows how to improve it.

Note

Stream docker-compose output line-by-line during interop test execution

Replaces the blocking subprocess.run call in interop.py with subprocess.Popen to stream stdout line-by-line to debug logs as the process runs, rather than dumping the full output buffer after completion. Timeout enforcement is reimplemented manually using time.time() instead of relying on the subprocess timeout parameter.

^{Macroscope summarized 42aee2f.}