feat(1b): add lint/format toolchain — lint devshell + scripts/lint.sh + ruff/yamllint config

ruff.toml

@@ -0,0 +1,16 @@
+# Ruff config for cc-ci Python (runner/ harness, bridge/, dashboard/, tests/). Phase 1b RL1.
+# ruff format owns style; ruff check owns lint. Line length matches the format default.
+line-length = 100
+target-version = "py311"
+
+[lint]
+# E/F = pyflakes+pycodestyle, W = warnings, I = import sorting, UP = pyupgrade,
+# B = bugbear (real footguns), C4 = comprehensions, SIM = simplify.
+select = ["E", "F", "W", "I", "UP", "B", "C4", "SIM"]
+# E501 (line too long) is left to the formatter; it only fires on un-splittable lines
+# (long string literals / URLs in comments) where wrapping would hurt readability.
+ignore = ["E501"]
+
+[lint.per-file-ignores]
+# Test files may use bare asserts and fixture-shadowing patterns pytest needs.
+"tests/**" = ["B011"]