Brings the gate stage section up to date

[johnnyt]

What changed

The "When a stage fails" section of CLAUDE.md now:

• names the constraint mix.exs carries, {:ex_quality, "~> 0.15"} (it said ~> 0.14);
• lists the eight stages a bare mix quality runs here - Format, Compile, Dependencies, Credo, Tests, Dialyzer, Docs, Doc links - where it listed six. The three expected ○ skipped (not installed) stages (Doctor, Gettext, Sobelow) are unchanged.

No other line of the section moves.

Refs: px-wm2w

Review (in-turn)

Checked against the bead's acceptance ("the sentence names the constraint mix.exs carries and the stage list matches a bare mix quality run"):

• Constraint: mix.exs @deps carries {:ex_quality, "~> 0.15", only: :dev, runtime: false}; mix.lock resolves it to 0.15.1.
• Stage list, read from ex_quality at the v0.15.1 tag (the locked version) rather than from a remembered run: Mix.Tasks.Quality always runs Format and Compile, then the @analysis_stages list (Credo, Dialyzer, Doctor, Docs, Doc links, Gettext, Sobelow, Dependencies) plus Tests. .quality.exs sets docs: [enabled: :auto] and doc_links: [enabled: :auto], and ExQuality.Config detects both from :ex_doc, which mix.exs carries as a dev dependency, so both run. Doctor, Gettext and Sobelow are not dependencies, so each is skipped with "not installed", matching gate.project_level_skips and gate.not_applicable_skips in .claude/wurk.json. That leaves eight running stages, which is the new list; the display names are the ones each stage module reports ("Tests", "Docs", "Doc links").
• mix quality itself was not run for this change; the list is read from the tool's source at the locked version.

Advisory, not changed (outside the bead): the loop-profile bullet in the same section says Dialyzer and the dependency audit do not run under --profile loop; Docs and Doc links do not run there either. The sentence does not claim to be exhaustive, so it is left as is.

Gate

Documentation only (CLAUDE.md is outside gate.build_paths and gate.also_gated_paths): "a change touching no Elixir code has no gate to run and may commit on review of the diff alone". No changelog fragment (changelog.d/README.md excludes documentation).

Tier: gate (documentation, no contract surface, a few lines).

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