[Demirrr]

Part of the print to logger cleanup in Improvements.md §3 (first of several module-by-module PRs).

• learners/nces.py and learners/nces2.py (so also ROCES): 27 print calls become logger calls with levels (info for status/verbose predictions, warning for missing/partial pretrained weights and auto-train notices, error for failures). Same convention as drill.py.
• ANSI colour escapes dropped; fixed the Ćheck typo; leftover debug print(num_workers) in NCES2.train is now logger.debug.
• Improvements.md counts updated (270 to ~245); CHANGELOG entry added.

Local: tests/test_nces.py, test_nces2.py, test_roces.py pass (3 passed; needed LD_PRELOAD of the system libstdc++ for pysat in my conda env, unrelated to this change); ruff clean.

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