Moves the format stage to check mode

.quality.exs

@@ -37,6 +37,14 @@
     warnings_as_errors: true
   ],
 
+  # Check-mode, not reformat-mode (sui-b5y, fleet-wide decision 2026-08-22):
+  # a gate that rewrites drifting files cannot report drift as a finding, so
+  # in CI unformatted code would pass instead of going red. Drift fails the
+  # stage; run `mix format` yourself before committing.
+  format: [
+    check: true
+  ],
+
   credo: [
     strict: true
   ],

CLAUDE.md

@@ -128,9 +128,10 @@ mix test                     # tests only
 ```
 
 Run `mix quality --profile loop` between edits; full `mix quality` must be green
-before any commit. The gate formats your code for you - do not run `mix format`
-as a separate step. See the ExQuality section at the end of this file for the
-rules the gate expects you to follow.
+before any commit. The format stage runs in check mode (`format: [check: true]`
+in `.quality.exs`, sui-b5y): drift fails the gate and nothing is rewritten, so
+run `mix format` yourself before committing. See the ExQuality section at the
+end of this file for the rules the gate expects you to follow.
 
 Toolchain lives in `mise.toml`, and it is deliberately thin: no JRE (the Saxon
 corpus transform is statifier-ex's), no Node (the JavaScript ships as source and

mix.exs

@@ -48,7 +48,7 @@ defmodule StatifierUI.MixProject do
       {:phoenix_live_view, "~> 1.0", optional: true},
 
       # Dev / test
-      {:ex_quality, "~> 0.13", only: :dev, runtime: false},
+      {:ex_quality, "~> 0.14", only: :dev, runtime: false},
       {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
       {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},
       {:excoveralls, "~> 0.18", only: :test},

mix.lock

@@ -7,7 +7,7 @@
   "earmark_parser": {:hex, :earmark_parser, "1.4.46", "67607a0532e810c6f630a515c548d0b24949643f168cc556303bee4cf96105c7", [:mix], [], "hexpm", "9c44636e8a1c68c62f526b2dcd85d941dbbcee7ab82cf64ba06ce28bef8e89f5"},
   "erlex": {:hex, :erlex, "0.2.9", "7debbbaa9f4f368b8cd648983e0f1d7963028508e9c59e9d4ed504e94ef52a55", [:mix], [], "hexpm", "8cfffc0ec7159e6d73de2ab28a588064de80f88b2798d5cbe4482cbbc200178b"},
   "ex_doc": {:hex, :ex_doc, "0.40.3", "4a972ffe64bc07dc605af487e98fc19b72a4185f55ca031b94c0552d6071c1d9", [:mix], [{:earmark_parser, "~> 1.4.44", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "2756e357742fecd9749b489b85d67c9ce99c465f2e75728d9e6dc8d704b973de"},
-  "ex_quality": {:hex, :ex_quality, "0.13.0", "dbe2dc02d40d7c6007d1808e677fbef34db1d1370f4814d10c6b8e46bae4cc43", [:mix], [{:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8dfc1df8b2fe5dcfff6073cd60303a09a2745a47e6b91143db32e72949dab0d2"},
+  "ex_quality": {:hex, :ex_quality, "0.14.0", "702ed122c85c1d1f1dca2efab60871884e9ba6aefc492f334da51a8175543cc6", [:mix], [{:jason, "~> 1.4", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "ac8553e6b7a6a35ada03ef748530db2c5871d69427d74a634fd37afdeabf7e24"},
   "excoveralls": {:hex, :excoveralls, "0.18.5", "e229d0a65982613332ec30f07940038fe451a2e5b29bce2a5022165f0c9b157e", [:mix], [{:castore, "~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "523fe8a15603f86d64852aab2abe8ddbd78e68579c8525ae765facc5eae01562"},
   "file_system": {:hex, :file_system, "1.1.1", "31864f4685b0148f25bd3fbef2b1228457c0c89024ad67f7a81a3ffbc0bbad3a", [:mix], [], "hexpm", "7a15ff97dfe526aeefb090a7a9d3d03aa907e100e262a0f8f7746b78f8f87a5d"},
   "jason": {:hex, :jason, "1.4.5", "2e3a008590b0b8d7388c20293e9dcc9cf3e5d642fd2a114e4cbbb52e595d940a", [:mix], [{:decimal, "~> 1.0 or ~> 2.0 or ~> 3.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "b0c823996102bcd0239b3c2444eb00409b72f6a140c1950bc8b457d836b30684"},