[codex] fix temporal values from from_list

[cigrainger]

Summary

• Encode Elixir Date, Time, NaiveDateTime, and DateTime structs as typed DuckDB literals in the small-list from_list/1 SQL path.
• Add a regression test covering temporal values in small lists.

Root Cause

Small list sources are represented as inline SELECT ... UNION ALL ... SQL, but Dux.QueryBuilder.encode_value/1 only handled nil, numbers, booleans, and strings. Temporal structs therefore raised a FunctionClauseError before DuckDB could evaluate the query. Large lists already used ADBC ingestion and did not hit this encoder.

Validation

• mix test test/dux/verb_test.exs
• Manual reproduction with Dux.peek/1 on the example from the issue

Fixes #51

[srowley]

Thanks! I am starting to get a little more familiar with the library and noticed that pin interpolation doesn't support temporal values. I wrote a fix and a test for that. The test passes after the fix and my uses for that functionality now work, but I can't run the entire test suite without getting a bunch of out-of-memory errors.

If you'd like me to submit a pull request with that I'm happy to; I just can't guarantee it didn't break something else.

Edit - I figured out how to run tests; pull request forthcoming. Also a separate PR for consideration that fixed the tests for me.