Brings the gate stage section up to date

CLAUDE.md

@@ -342,7 +342,7 @@ required, this file wins.
 
 The full reference is **`deps/ex_quality/usage-rules.md`**, vendored with the
 dependency, so it is the version of the tool this repo actually runs
-(`{:ex_quality, "~> 0.14"}`). Read it when a stage fails in a way its own
+(`{:ex_quality, "~> 0.15"}`). Read it when a stage fails in a way its own
 output does not explain, or when you need the shape of the JSON report. Fetch
 it with `mix deps.get` if `deps/` is cold; do not go looking for the rules on
 the web instead.
@@ -353,8 +353,9 @@ Four rules do not wait to be looked up:
   stage costs one line and detail prints only for failures, so truncating
   removes findings, not noise.
 - **Read the `○` lines.** A skipped stage is not a passing one. This repo runs
-  six stages - Format, Compile, Dependencies, Credo, Tests, Dialyzer - and
-  three are reported `○ skipped (not installed)`: Doctor, Gettext, Sobelow.
+  eight stages - Format, Compile, Dependencies, Credo, Tests, Dialyzer, Docs,
+  Doc links - and three are reported `○ skipped (not installed)`: Doctor,
+  Gettext, Sobelow.
   Those three are recorded in `.claude/wurk.json` under
   `gate.project_level_skips` and `gate.not_applicable_skips` and are the
   expected state. Any other `○` in a full run is a real gap and is worth