tooling: pin the ruff rule selection and move CI to 0.16.1 (#40)

Ruff 0.16 widened its default lint selection (UP, LOG, BLE, I, RUF and more) and
began formatting Python code blocks embedded in Markdown. The result was that an
unchanged codebase reported 0 or 381 violations depending only on which ruff you
ran, and four docs files showed phantom format diffs locally that CI never saw.

Declare select = ["E4", "E7", "E9", "F"] explicitly so the project's rule set no
longer depends on ruff's shifting defaults, exclude Markdown from check and
format, and bump the CI pin. Verified clean on BOTH 0.16.1 and 0.15.21 with no
source changes, so widening the rule set stays a deliberate act rather than an
upgrade side-effect.

Also adds .DS_Store to .gitignore; it was absent, which is why stray copies sat
untracked in the working tree.

Closes #39.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: dcj

.github/workflows/lint.yml

@@ -13,6 +13,6 @@ jobs:
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: "3.12"
-      - run: pip install ruff==0.15.21
+      - run: pip install ruff==0.16.1
       - run: ruff check .
       - run: ruff format --check .

.gitignore

@@ -28,3 +28,6 @@ htmlcov/
 
 # Local config files (contain secrets)
 broker-cfg*.json
+
+# macOS
+.DS_Store

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to `ebus-sdk` are recorded here. Format follows [Keep a Chan
 
 ## [Unreleased]
 
+### Changed
+
+- Tooling: the ruff lint selection is now declared explicitly (`select = ["E4", "E7", "E9", "F"]`) rather than inherited from ruff's defaults, and CI moves from ruff 0.15.21 to 0.16.1. Ruff 0.16 widened its default selection (UP, LOG, BLE, I, RUF and more) and began formatting Python code blocks embedded in Markdown, so an unchanged codebase reported 0 or 381 violations depending only on which ruff you happened to run, and four docs files showed phantom format diffs locally that CI never saw. Pinning the set decouples "what this project lints for" from "what version of ruff is installed"; `extend-exclude = ["*.md"]` keeps prose out of both check and format. Verified clean on both 0.16.1 and 0.15.21, with no source changes. Widening the rule set (the 381) is now a deliberate act rather than an upgrade side-effect. ([#39](https://github.com/electrification-bus/python-sdk/issues/39))
+
 ## [0.18.1] — 2026-08-07
 
 ### Added

pyproject.toml

@@ -74,8 +74,19 @@ ebus_sdk = ["py.typed"]
 
 [tool.ruff]
 line-length = 120
+# Ruff 0.16 formats Python code blocks embedded in Markdown. This repo's docs are
+# prose that happens to contain illustrative snippets, not a formatting target, so
+# keep them out of both check and format.
+extend-exclude = ["*.md"]
 
 [tool.ruff.lint]
+# Declared explicitly rather than inherited: ruff's default selection changed in
+# 0.16 (it began enforcing UP, LOG, BLE, I, RUF and more), which turned an
+# unchanged codebase into 381 violations depending only on which ruff you ran.
+# Pinning the set here decouples "what this project lints for" from "what version
+# of ruff you happen to have". Widening it is a deliberate act, not an upgrade
+# side-effect.
+select = ["E4", "E7", "E9", "F"]
 # E402: module-level imports not at top — triggered by __future__ + docstring pattern
 # E721: type comparison with == — intentional in datatype_from_type()
 ignore = ["E402", "E721"]