fix(py): exclude markdown from ruff scope (0.16+ formats code fences)

Author: KooshaPari

ruff.toml

@@ -15,6 +15,10 @@ line-length = 100
 extend-exclude = [
     "codex-rs",
     "codex-cli",
+    # Ruff 0.16+ also formats Python code fences inside Markdown, which
+    # churns research/consolidated docs on every formatter upgrade. Scope
+    # the formatter to Python source files only.
+    "*.md",
 ]
 
 # Enable rule sections