Enabled all Ruff lint rules and resolved findings with justified inline suppressions.

pyproject.toml

@@ -72,60 +72,32 @@ target-version = "py312"
 extend-exclude = ["owlbot/_version.py"]  # auto-generated by hatch-vcs
 
 [tool.ruff.lint]
-select = [
-    # Core
-    "F",     # Pyflakes
-    "E",     # pycodestyle errors
-    "W",     # pycodestyle warnings
-    "N",     # pep8-naming
-    "D",     # pydocstyle
-    "I",     # isort
-    "ICN",   # flake8-import-conventions
-
-    # Correctness & bugs
-    "B",     # flake8-bugbear
-    "ASYNC", # flake8-async
-    "DTZ",   # flake8-datetimez
-    "RSE",   # flake8-raise
-    "RET",   # flake8-return
-    "A",     # flake8-builtins
-    "PIE",   # flake8-pie
-
-    # Modernization & simplification
-    "UP",    # pyupgrade
-    "SIM",   # flake8-simplify
-    "C4",    # flake8-comprehensions
-    "FLY",   # flynt (f-string conversion)
-    "PTH",   # flake8-use-pathlib
-
-    # Performance
-    "PERF",  # Perflint
-
-    # Security
-    "S",     # flake8-bandit
-
-    # Code hygiene
-    "T10",   # flake8-debugger
-    "T20",   # flake8-print
-    "ERA",   # eradicate
-    "PGH",   # pygrep-hooks
-    "TCH",   # flake8-type-checking
-
-    # Testing
-    "PT",    # flake8-pytest-style
-
-    # Ruff-specific
-    "RUF",   # Ruff-specific rules
-]
+select = ["ALL"]
 ignore = [
-    "D203",  # incompatible with D211 (no blank line before class docstring)
-    "D213",  # incompatible with D212 (summary on first line)
+    "ANN401",  # Any is valid at system boundaries; mypy strict handles real issues
+    "C901",    # McCabe complexity: noisy and not actionable
+    "COM812",  # handled by the formatter
+    "D203",    # incompatible with D211 (no blank line before class docstring)
+    "D213",    # incompatible with D212 (summary on first line)
+    "EM",      # exception message style: inline literals are fine
+    "PLR0911", # too many return statements: flat early-returns are clear
+    "PLR0912", # too many branches: inherent in parsers, validators, CLI
+    "PLR0913", # too many arguments: API surfaces and constructors need them
+    "PLR0915", # too many statements: inherent in parsers, validators, CLI
+    "TRY003",  # inline exception messages are fine (complements EM ignore)
+    "TRY301",  # raise inside try: guard clauses don't need helper functions
 ]
 
 [tool.ruff.lint.per-file-ignores]
 "owlbot/__init__.py" = ["E402"]     # constants defined before imports intentionally
 "owlbot/__main__.py" = ["T201"]     # CLI entry point uses print() for user output
-"tests/**" = ["S101", "S311"]       # assert is standard for pytest; random is fine in tests
+"tests/**" = [
+    "S101",     # assert is standard for pytest
+    "S311",     # pseudo-random generators are fine in tests
+    "SLF001",   # tests legitimately access private members for verification
+    "ARG001",   # unused args are normal for fixtures and handler stubs
+    "PLR2004",  # magic values are clear in test assertions
+]
 
 [tool.codespell]
 skip = "owlbot/_version.py,uv.lock"