concore stop can kill unrelated processes due to overly broad substring matching #580

Ran into another one while going through concore_cli/commands/stop.py (status.py has the same code).

Process matching there is just "concore" in cmdline_str.lower(), a plain substring check. So any process that happens to have "concore" anywhere in its command line gets treated as a concore process and force killed.

Easy to hit by accident too, since a lot of people will clone this repo into a folder literally named concore. Anything else running from inside that folder, an editor, a script, whatever, ends up with that path in its argv and matches.

Tested it by pulling the exact matching logic out of stop.py and running it against a few unrelated cmdlines, all came back as a match even though none of them are concore processes.

Different from #391 and #280, those were about the old concorekill.bat mechanism and taskkill's return code. This is earlier than that, the process discovery itself is too loose.