v2.40.0: log sampled rollout completions during training

Features

• log sampled rollout completions during training

  train_llm_rollout takes a new completion_logging=CompletionLoggingConfig(...) argument. When set, each iteration samples prompt groups from the rollout batch and decodes prompt, completion, reward, turn count and completion-token count. Every interval iterations the samples from every population member go in one write to the console (verbose), a W&B completions table (wb) and an optional JSONL file (jsonl_path). Text fields are capped at max_chars, keeping head and tail. The latest samples are also logged at error level if training raises.

  The building blocks (CompletionLogger, CompletionRecord, build_completion_record and the writers) live in agilerl.training.llm.completion_logging for custom training loops.

Other

• bump GitHub Actions off Node 20 and CodeQL Action v3

  Put the CodeQL job steps in .github/workflows/codeql.yml so that file has
  on.push (CI still calls it as a merge gate; push to main and the weekly
  schedule still feed the Security tab). Use actions/checkout@v5 and
  github/codeql-action v4.

Full Changelog: v2.39.0...v2.40.0