fix: remove accidental debug logging from decoder pipeline

[harshaa765]

Summary

• Removes two max_logging.info(f"DEBUG: ...") statements that were accidentally committed to the pipeline scan path inside Decoder.__call__ (layers/decoders.py, previously lines 1029–1030).
• These lines emitted on every decode step, polluting production inference logs with internal debug output.
• No logic change — surrounding current_broadcast_args construction and scan_decoder_layers call are untouched.

Test plan

• Python syntax verified locally (ast.parse passes).
• Existing unit and integration tests for the decoder path cover the surrounding logic (no new test needed — this is a pure log-line deletion with no behavioral change).

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