chore: add E225 and E251 ruff lint rules for spacing around =

Agent-Logs-Url: https://github.com/CyberAgentAILab/python-dte-adjustment/sessions/c78547a9-11d0-425a-b916-dfbcc417a12f

Co-authored-by: TomeHirata <33407409+TomeHirata@users.noreply.github.com>

Author: Copilot

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ repos:
     hooks:
       - id: ruff
         name: ruff (linter)
-        args: [--fix]
+        args: [--fix, --preview]
       - id: ruff-format
         name: ruff (formatter)
   - repo: https://github.com/pre-commit/pre-commit-hooks

pyproject.toml

@@ -57,8 +57,11 @@ dev-dependencies = [
 ]
 
 [tool.ruff.lint]
+preview = true
 # TID252: Ban relative imports - enforce absolute imports for internal modules
-select = ["TID252"]
+# E225: Missing whitespace around operator (e.g. x=1 → x = 1)
+# E251: Unexpected spaces around keyword / parameter equals (e.g. def f(a =0) → def f(a=0))
+select = ["TID252", "E225", "E251"]
 
 [tool.ruff.lint.flake8-tidy-imports]
 # Ban all relative imports