diff --git a/.prettierignore b/.prettierignore
index 46d003d..5c04ace 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,10 +1,17 @@
 # Prettier ignore file
 
+# Vendored third-party trees (not formatted here)
+vendor/
+
 # Dependencies
 node_modules/
 pnpm-lock.yaml
 .pnpm-store/
 
+# Lockfiles (avoid massive churn; not hand-edited as prose)
+poetry.lock
+uv.lock
+
 # Build output
 dist/
 build/
diff --git a/eslint.config.mjs b/eslint.config.mjs
index b087cb0..7d82d7b 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -7,6 +7,7 @@ import globals from "globals";
 export default [
     {
         ignores: [
+            "**/vendor/**",
             "**/node_modules/**",
             "**/dist/**",
             "**/build/**",
diff --git a/meshchatx/src/backend/licenses_collector.py b/meshchatx/src/backend/licenses_collector.py
index 8162c84..fe9f9d8 100644
--- a/meshchatx/src/backend/licenses_collector.py
+++ b/meshchatx/src/backend/licenses_collector.py
@@ -173,7 +173,9 @@ def _bundled_lxmfy_license_row(repo_root: Path) -> dict[str, Any] | None:
     }
 
 
-def _merge_bundled_lxmfy(repo_root: Path, rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
+def _merge_bundled_lxmfy(
+    repo_root: Path, rows: list[dict[str, Any]]
+) -> list[dict[str, Any]]:
     if any(str(r.get("name") or "").lower() == "lxmfy" for r in rows):
         return rows
     row = _bundled_lxmfy_license_row(repo_root)
diff --git a/pyproject.toml b/pyproject.toml
index a03d28a..30d1396 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -90,12 +90,17 @@ build-backend = "setuptools.build_meta"
 [tool.ruff]
 exclude = [
     ".git",
+    ".mypy_cache",
     ".pnpm-store",
+    ".ruff_cache",
+    "build",
+    "dist",
     "node_modules",
     "venv",
     ".venv",
     "tests/frontend",
     "vendor",
+    "*.egg-info",
 ]
 
 [tool.ruff.lint]