Update toolchain to Elixir 1.20 and OTP 29 - #30
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Bump .tool-versions, mix.exs requirement, and CI/release setup-beam to Elixir 1.20.0 / Erlang 29.0.1. Key the mix and PLT caches on the BEAM version so a toolchain bump invalidates stale OTP-28 artifacts instead of failing dialyzer on an old PLT.
mix deps.update --all within existing version constraints; no mix.exs changes. Verified full mix quality green on Elixir 1.20 / OTP 29.
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Summary
.tool-versionstoerlang 29.0.1/elixir 1.20.0-otp-29mix.exsrequirement to~> 1.20setup-beamat Elixir 1.20.0 / OTP 29.0.1mix(deps/_build) and PLT caches on the BEAM version so a toolchain bump invalidates stale OTP-28 artifacts instead of failing dialyzer on an old PLTElixir 1.20+ / OTP 29+mix deps.update --allto latest within existing constraints (mix.lock only; nomix.exsdep changes). Notable: bandit 1.10.4→1.11.1, cli_mate 0.10.0→0.10.2, doctor 0.22→0.23, mint 1.7.1→1.9.0, finch 0.21→0.22, igniter 0.7.9→0.8.1, plug 1.19.1→1.19.2, thousand_island 1.4.3→1.5.0Test plan
mix quality(full: format, compile w/ warnings-as-errors, deps, doctor, credo, dialyzer, tests) green on Elixir 1.20.0 / OTP 29 — 63% coveragemix qualityafterdeps.update --all— still green (dialyzer PLT rebuilt)mix quality) passed on both commitsmix hex.audit— no retired/insecure packagesKnown issue (pre-existing, not from this PR)
Local
MIX_ENV=prod mix release sevfails on macOS 26 / Xcode 26.4.1: zig 0.15.2 can't link against the host SDK (__availability_version_check), and burrito 1.5 hard-rejects zig 0.16. OTP 29 ERTS itself fetches/unpacks fine. Releases build via CI (release.ymlon tag), which cross-compiles from Linux with zig's bundled SDK stubs and is unaffected.Note: third-party deps (bandit, mint, plug, etc.) emit new 1.20 bitstring-
size/pin and dialyzer clause warnings during compile. Severance's own code compiles clean under warnings-as-errors.