chore: update deps + nix env to latest, target Elixir 1.20#4
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- flake: bump both nixpkgs inputs to latest; use beamMinimal28Packages.elixir_1_20 (Elixir 1.20.1 / OTP 28.5.0.2) - mix.exs: require Elixir ~> 1.18; bump telemetry, opentelemetry*, jason, req_llm, jido, ex_doc, dialyxir, credo constraints to latest minor lines - fix Elixir 1.20 type warnings: - reorder normalize_model_string/1 clauses (provider+model clause was unreachable) - replace always-false handler_id comparison in multi_backend_test with per-tag asserts Verified: mix compile --warnings-as-errors, mix test (230 pass / 8 excluded), mix format --check-formatted, mix credo --strict, mix dialyzer all green.
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Refreshes the dev environment and all dependencies to the latest, moving the toolchain to Elixir 1.20.
Toolchain
flake.nix:unstable.beamMinimal28Packages.elixir_1_19→elixir_1_20; both nixpkgs inputs bumped to latest (nixos-25.11→ 2026-06-15,nixpkgs-unstable→ 2026-06-16).elixir-lsandlivebookstill build against the new pin.Dependencies
~> 1.0~> 1.4(1.4.2)~> 1.2~> 1.5(1.5.0)~> 1.3~> 1.7(1.7.0)~> 1.6~> 1.10(1.10.0)~> 1.2~> 1.4(1.4.5)~> 1.0~> 1.16(1.16.0)~> 2.0~> 2.3(2.3.2)~> 0.28~> 0.40(0.40.3)~> 1.0~> 1.4(1.4.7)~> 1.6~> 1.7(1.7.19)mix.exsElixir requirement:~> 1.14→~> 1.18(dev env is 1.20; floor kept wide enough to stay installable on 1.18/1.19 for a published library).Code (fixes for new Elixir 1.20 type warnings)
lib/agent_obs/req_llm.ex: reordernormalize_model_string/1clauses — the%{provider:, model:}clause was placed after the broader%{model:}clause and was therefore unreachable, so provider-tagged maps never got the"provider:model"formatting. 1.20's type checker surfaced this latent bug; specific clause now comes first.test/agent_obs/multi_backend_test.exs: replace an always-falserefute ... ==comparison of disjoint tuple types with explicit per-tag asserts (:agent_obs_phoenix/:agent_obs_generic).Verification (all green on Elixir 1.20.1 / OTP 28)
mix compile --warnings-as-errors,mix test(230 passed / 8 excluded),mix format --check-formatted,mix credo --strict,mix dialyzer— all pass.CI
.github/workflows/ci.ymlruns everything throughnix develop, so it inherits the toolchain from the flake — no workflow edit needed.