chore: update toolchain and dependencies#2
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Bump the Nix-pinned toolchain to Elixir 1.20.1 / OTP 28 and refresh Hex dependencies for compatibility. Toolchain: - nix flake update (nixpkgs + nixpkgs-unstable) - Pin Elixir 1.20 on OTP 28 explicitly (the default `elixir` attr still tracks 1.18), via `beam.packages.erlang_28.elixir_1_20` - Bump `mix.exs` elixir requirement to ~> 1.20 Dependencies (mix deps.update --all): - credo 1.7.12 -> 1.7.19 - decimal 2.3.0 -> 3.1.1 (transitive via ecto) - dialyxir 1.4.6 -> 1.4.7 - earmark_parser 1.4.44 -> 1.4.45 - ecto 3.13.3 -> 3.14.0 - erlex 0.2.7 -> 0.2.9 - ex_doc 0.38.4 -> 0.40.3 - jason 1.4.4 -> 1.4.5 - makeup_erlang 1.0.2 -> 1.1.0 - stream_data 1.2.0 -> 1.3.0 - telemetry 1.3.0 -> 1.4.2 Mix 1.20 compatibility: - Move `preferred_cli_env` from `project/0` into the new `cli/0` callback as `preferred_envs` (the old location is deprecated in Mix 1.20) Compiles with zero warnings under --warnings-as-errors; format, credo, and the full test suite (197 passed) are green.
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Summary
Modernizes the dev toolchain and Hex dependencies, and ensures the library builds cleanly on the latest compiler (Elixir 1.20.1 / OTP 28) with zero warnings.
Toolchain
nix flake updaterefreshednixpkgs(2025-10-04 → 2026-01-02) andnixpkgs-unstable(2025-10-04 → 2026-06-16).elixirattr in unstable still tracks 1.18, so the flake now pins Elixir 1.20 on OTP 28 explicitly viabeam.packages.erlang_28.elixir_1_20(anderlang_28,beam.elixir-ls).mix.exselixir:requirement bumped~> 1.14→~> 1.20.Dependencies (
mix deps.update --all)No deps held back — all updated to latest resolvable.
Mix 1.20 compatibility
preferred_cli_envout ofproject/0(deprecated in Mix 1.20) into the newcli/0callback aspreferred_envs.CI confirmation (run locally inside the Nix flake)
mix compile --warnings-as-errors --force— zero warningsmix test— 197 passed (11 properties, 186 tests), 8 excluded (:claude_code_acp, require an API key)mix format --check-formatted— cleanmix credo— no issuesKnown limitations / blockers
mix dialyzerreports pre-existingno_return/ contract warnings on every schemachangeset/1function (the@spec changeset(t(), map())combined with thestruct \\ %__MODULE__{}default arg). These are not a regression — they reproduce identically onmainwith the new toolchain, and Dialyzer is not part of the CI workflow (ci.ymlruns compile/test/format/credo only). Left out of scope for this dependency/toolchain PR; worth a separate follow-up to either relax the specs or add a Dialyzer ignore file and wire it into CI.