Moves the dev dependency to ex_quality 0.15.1

[johnnyt]

Moves the dev dependency to ex_quality 0.15.1 (bead px-e1qe).

What changed

• mix.lock: the ex_quality line moves from 0.15.0 to 0.15.1. It is the only lock line that moved; mix deps.update ex_quality reported every other package unchanged.
• mix.exs is untouched: its constraint {:ex_quality, "~> 0.15", ...} already admits 0.15.1.

ex_quality 0.15.1 fixes the Docs stage. 0.15.0 counted only ExDoc warning lines starting with warning:, and ExDoc 0.40 on Elixir 1.18 indents them, so the stage could report no warnings over docs that warned. 0.15.1 reads both shapes and also passes --warnings-as-errors to mix docs.

Docs stage findings

None. On 0.15.1 the Docs stage reports No warnings, and MIX_ENV=dev mix docs --warnings-as-errors exits 0 with no warning lines in its output. No skip_code_autolink_to entry was needed, and the existing skip_undefined_reference_warnings_on: ["CHANGELOG.md"] stays as it was.

Gate

Full mix quality green on this tree with ex_quality 0.15.1 in deps/: Format, Compile, Doc links, Dependencies, Credo, Docs, Tests (2,914 of 2,914 passed, 95.6% coverage), Dialyzer. Doctor, Gettext and Sobelow are skipped as not installed, the expected state recorded in .claude/wurk.json. The commit was made on the staged tree byte-identical to the tree that run went green on.

No changelog fragment: changelog.d/README.md excludes tooling changes. No gate-change log or record is required by this repo's CLAUDE.md for a dependency move. No version bump.

Review

In-turn review, tier=gate: the diff is one mix.lock line and touches no contract surface (no public function, module, option, wire shape or corpus file) and is far under the size threshold. I re-read the diff against the bead's acceptance: the lock resolves 0.15.1 from Hex with the checksum pair Hex served; the constraint admits it; the Docs stage runs on 0.15.1 (confirmed from the vendored deps/ex_quality/mix.exs version) and is green; the docs build with warnings as errors exits 0; no other dependency moved.

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