Update toolchain to Elixir 1.20 final

[bglusman]

Summary

• Update mise and asdf toolchain manifests from Elixir 1.20 RC to final 1.20.0 on OTP 29
• Align CI/release setup-beam config and Tinfoil metadata with final Elixir 1.20.0
• Update Dune to 0.3.16 and remove the deprecated Phoenix compiler entry from the project compiler list

Verification

• cd app && MIX_HOME=/tmp/wardwright-mix-otp29 HEX_HOME=/tmp/wardwright-hex-otp29 mise exec -- mix format --check-formatted
• cd app && MIX_HOME=/tmp/wardwright-mix-otp29 HEX_HOME=/tmp/wardwright-hex-otp29 mise exec -- mix test
• cd app && MIX_HOME=/tmp/wardwright-mix-otp29 HEX_HOME=/tmp/wardwright-hex-otp29 mise exec -- mix compile --warnings-as-errors
• git diff --check

Summary by Sourcery

Update the Elixir toolchain and related configuration to target the final Elixir 1.20.0 on OTP 29 and align dependencies and compilers accordingly.

Enhancements:

• Exclude the deprecated Phoenix compiler from the Mix project compiler list.
• Bump the Dune dependency to version ~> 0.3.16.

Build:

• Update mise toolchain configuration to use Elixir 1.20.0-otp-29 instead of the 1.20 RC build.

CI:

• Update CI and release GitHub Actions workflows to use Elixir 1.20.0 instead of the 1.20.0-rc.6 release candidate and align embedded Elixir version metadata in project configuration.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the Elixir/OTP toolchain from 1.20 RC to the final 1.20.0 release across local dev (mise/asdf), CI, and release workflows, updates the Dune dependency, and adjusts the Mix compiler list to drop the deprecated Phoenix compiler entry.

File-Level Changes

Change	Details	Files
Standardize Elixir/OTP version on 1.20.0 / OTP 29 across CI and release workflows.	Update GitHub Actions setup-beam configuration to use Elixir 1.20.0 instead of 1.20.0-rc.6 for all jobs Keep OTP pinned at 29.0 and Gleam at 1.17.0 while bumping only the Elixir version	.github/workflows/wardwright-release.yml .github/workflows/ci.yml
Update local toolchain manifests to the final Elixir 1.20.0 on OTP 29.	Bump mise Elixir tool entry from 1.20.0-rc.6-otp-29 to 1.20.0-otp-29 Align asdf .tool-versions Elixir entry with the final 1.20.0 on OTP 29	mise.toml .tool-versions
Adjust Mix project configuration for Elixir 1.20 and clean up compiler/dependency setup.	Exclude the deprecated :phoenix compiler from Mix.compilers/0 while preserving Gleam compilers prefixing Update Dune dependency from ~> 0.3.15 to ~> 0.3.16 Align Tinfoil/CI metadata in mix.exs to report Elixir 1.20.0 instead of the RC Refresh mix.lock to capture the new Dune version and any transitive resolution changes	app/mix.exs app/mix.lock

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[gemini-code-assist]

Code Review

This pull request updates the Elixir version to 1.20.0 across .tool-versions, mise.toml, and mix.exs, and upgrades the dune dependency to version 0.3.16. It also modifies the compilers list in mix.exs to subtract :phoenix. Feedback indicates that subtracting :phoenix from Mix.compilers() is redundant as it is not included in the default compilers list, and suggests simplifying the compilers configuration.

Important

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[sourcery-ai]

Hey - I've found 2 issues

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="app/mix.exs" line_range="116" />
<code_context>
       version: "0.0.11",
       elixir: "~> 1.18",
-      compilers: [:gleam_deps, :gleam] ++ Mix.compilers(),
+      compilers: [:gleam_deps, :gleam] ++ (Mix.compilers() -- [:phoenix]),
       aliases: ["deps.get": ["deps.get", "gleam.deps.get"]],
       erlc_paths: [
</code_context>
<issue_to_address>
**issue (bug_risk):** Double‑check that removing the :phoenix compiler won’t skip any Phoenix-specific compilation steps you still rely on.

`Mix.compilers() -- [:phoenix]` changes behavior from the default pipeline. If any Phoenix templates/views or other compile-time hooks still rely on the `:phoenix` compiler (e.g. `.eex`/`.heex` compilation), they’ll stop running. Please confirm those responsibilities are either obsolete or handled elsewhere before making this change.
</issue_to_address>

### Comment 2
<location path=".github/workflows/ci.yml" line_range="25" />
<code_context>
         with:
           otp-version: "29.0"
-          elixir-version: "1.20.0-rc.6"
+          elixir-version: "1.20.0"
           gleam-version: "1.17.0"
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
</code_context>
<issue_to_address>
**suggestion:** Consider reducing duplication of Elixir version strings across workflows and config to simplify future bumps.

The Elixir version is duplicated across `ci.yml`, `wardwright-release.yml`, `mise.toml`, and `mix.exs`, increasing the chance of inconsistency on future bumps. Within each workflow, consider centralizing it via a top-level `env:` value or YAML anchor so you only update it in one place per file.

Suggested implementation:

```
          elixir-version: "${{ env.ELIXIR_VERSION }}"

```

```
          elixir-version: "${{ env.ELIXIR_VERSION }}"

```

To fully implement the suggestion and avoid duplication in this workflow, you should also:
1. Add a top-level `env:` block in `.github/workflows/ci.yml` (likely near the top of the file, alongside `name:` and `on:`) defining a single `ELIXIR_VERSION` value, for example:
   ```yaml
   env:
     ELIXIR_VERSION: "1.20.0"
   ```
2. If there are other `elixir-version:` occurrences elsewhere in `ci.yml`, update them to also use `${{ env.ELIXIR_VERSION }}` so there is exactly one Elixir version definition per workflow file.
</issue_to_address>

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[Copilot]

Pull request overview

Updates the repository’s Elixir toolchain configuration and CI/release workflows to target Elixir 1.20 (moving from an RC to a final version), and adjusts app build configuration accordingly.

Changes:

• Bump Elixir toolchain references from 1.20.0-rc.6 to 1.20.0 (mise/asdf, CI, release workflow, and tinfoil metadata).
• Update the app’s Mix configuration to exclude the deprecated Phoenix compiler entry and bump :dune dependency.
• Update the lockfile to reflect the new :dune version.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
mise.toml	Updates mise-managed Elixir toolchain version.
app/mix.exs	Adjusts compiler list, tinfoil CI metadata, and bumps :dune requirement.
app/mix.lock	Updates locked :dune version/checksums.
.tool-versions	Updates asdf-managed Elixir toolchain version.
.github/workflows/ci.yml	Aligns CI setup-beam Elixir version to the new target.
.github/workflows/wardwright-release.yml	Aligns release workflow setup-beam Elixir version to the new target.