tubedude / finance-elixir / 975f2c0a897b4e7014725d3504723b33a9bffd82-PR-28

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Pull #28

github

Lower the Elixir floor to ~> 1.15 and test it in CI

The only feature gating < 1.18 was Enum.sum_by/2 (Elixir 1.18), introduced in
the 1.6.1 review pass; revert those six sites to Enum.reduce. The rest of the
code is ~1.12 vintage. Widen the CI matrix to 1.15.8/25 and 1.18.4/27 (test
only); format and Credo run on the newest version, whose formatter output is the
reference.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AVibXT2w1dEdVtMHqffFKn

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