<commit_before>- add validation framework
- catch (and report) missing module error in expression
- support two different filter hooks. one after each render, and one after all
  rendering. maybe pre_filters, render_filters, and post_filters
<commit_msg>updated TODO<commit_after>- add validation framework
- catch (and report) missing module error in expression

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{'dir': 'git-commits-cleaned', 'id': '2413415', 'n_tokens_mistral': 86, 'n_tokens_neox': 84, 'n_words': 44}