fix: import pathlib in rleapp.py so --custom_artifacts_path works

[abrignoni]

main() calls pathlib.Path(args.custom_artifacts_path) at line 195, but pathlib is never imported, and it is not re-exported by any of the three wildcard imports at the top of the file (checked each one). Passing the flag aborts before anything happens.

Reproduced against main

$ python3 rleapp.py --custom_artifacts_path /tmp/somedir -p
Traceback (most recent call last):
  File "rleapp.py", line 498, in <module>
    main()
  File "rleapp.py", line 195, in main
    loader_paths.append(pathlib.Path(args.custom_artifacts_path))
                        ^^^^^^^
NameError: name 'pathlib' is not defined. Did you mean: 'hashlib'?

The flag has presumably never worked. Line 195 sits immediately after parse_args() with no early exit before it, so the crash is unconditional whenever the option is supplied.

After

Same command completes normally, loading the extra path:

*[Dd][Vv] [Aa]ccess [Ll]ogs*.csv
*contacts_*.txt

Artifact path list generation completed

Why it went unnoticed

pylint has been reporting it on every run:

rleapp.py:195:28: E0602: Undefined variable 'pathlib'

but the repo had no lint workflow until #380, so nothing surfaced it. Worth noting that the diff-aware check added there would not catch this either — it fails only on warnings a change introduces, and this one predates any change. It showed up because I was measuring the pre-existing baseline while writing that workflow.

rleapp.py goes from 14 pre-existing warnings to 13; the new lint gate reports No new warnings introduced (1 fewer than before). PASS.

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