Remove erroneous code formatter

CLAUDE.md

@@ -34,7 +34,12 @@ uv run stack
 uv run flake8 --config tox.ini
 ```
 
-Formatting uses `black` (available via `uv run black`). Linting config is in `tox.ini`.
+Linting config is in `tox.ini`; `./scripts/lint.sh` runs what CI runs.
+
+There is no autoformatter, deliberately. `max-line-length` is a ceiling, not a target: code
+wrapped shorter than it is wrapped that way on purpose, and a formatter that joins those
+lines back up to the limit is not wanted here. Match the wrapping of the surrounding code
+by hand.
 
 ## Testing
 

pyproject.toml

@@ -32,12 +32,7 @@ requires-python = ">=3.10"
 stack = "stack:main.cli"
 
 [dependency-groups]
-dev = ["flake8", "black", "pytest"]
-
-[tool.black]
-# Matches flake8's max-line-length in tox.ini. Without this black defaults to 88
-# and reformats the whole file it is pointed at, so keep the two in step.
-line-length = 132
+dev = ["flake8", "pytest"]
 
 [tool.pytest.ini_options]
 testpaths = ["tests/unit"]

scripts/lint.sh

@@ -1,8 +1,12 @@
 #!/bin/bash
-
-if [[ "$1" == "--fix" ]]; then
-  LINE_LENGTH=$(cat tox.ini | grep 'max-line-length' | cut -d'=' -f2 | awk '{ print $1 }')
-  uv run black -l ${LINE_LENGTH:-132} src/stack/
-fi
+#
+# Lints the source. This is what CI runs, so it is the check to satisfy before
+# pushing.
+#
+# There is deliberately no --fix: the formatter that used to live here (black
+# -l 132) treats the line length as a target rather than a ceiling, so it joins
+# hand-wrapped code into single long lines. Nothing in the source needs
+# reformatting -- max-line-length in tox.ini is a limit, and wrapping shorter
+# than it is a choice made for readability, not a defect to be corrected.
 
 uv run flake8 --config tox.ini