diff --git a/.claude/settings.json b/.claude/settings.json
new file mode 100644
index 0000000..372538d
--- /dev/null
+++ b/.claude/settings.json
@@ -0,0 +1,24 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git status*)",
+      "Bash(git diff*)",
+      "Bash(git log*)",
+      "Bash(git add*)",
+      "Bash(git commit*)",
+      "Bash(git push*)",
+      "Bash(git branch*)",
+      "Bash(git checkout*)",
+      "Bash(git stash*)",
+      "Bash(git remote*)",
+      "Bash(ruff check*)",
+      "Bash(ruff format*)",
+      "Bash(pytest*)",
+      "Bash(python -m pytest*)",
+      "Bash(pip install*)",
+      "Bash(pip list*)",
+      "Bash(soup *)",
+      "Bash(python -m soup_cli*)"
+    ]
+  }
+}
diff --git a/soup_cli/config/schema.py b/soup_cli/config/schema.py
index 8259f5d..157d558 100644
--- a/soup_cli/config/schema.py
+++ b/soup_cli/config/schema.py
@@ -1,6 +1,6 @@
 """Pydantic schemas for soup.yaml config — single source of truth."""
 
-from typing import Literal, Optional
+from typing import List, Literal, Optional, Union
 
 from pydantic import BaseModel, Field
 
@@ -9,7 +9,7 @@ class LoraConfig(BaseModel):
     r: int = Field(default=64, description="LoRA rank")
     alpha: int = Field(default=16, description="LoRA alpha")
     dropout: float = Field(default=0.05, description="LoRA dropout")
-    target_modules: str | list[str] = Field(
+    target_modules: Union[str, List[str]] = Field(
         default="auto",
         description="Target modules for LoRA. 'auto' = let peft decide.",
     )
@@ -28,7 +28,7 @@ class DataConfig(BaseModel):
 class TrainingConfig(BaseModel):
     epochs: int = Field(default=3, ge=1, description="Number of training epochs")
     lr: float = Field(default=2e-5, gt=0, description="Learning rate")
-    batch_size: int | Literal["auto"] = Field(
+    batch_size: Union[int, Literal["auto"]] = Field(
         default="auto",
         description="Batch size. 'auto' = find max that fits in memory.",
     )
diff --git a/soup_cli/data/validator.py b/soup_cli/data/validator.py
index 1d322b8..688525f 100644
--- a/soup_cli/data/validator.py
+++ b/soup_cli/data/validator.py
@@ -1,9 +1,11 @@
 """Dataset validation and statistics."""
 
+from typing import Optional
+
 from soup_cli.data.formats import FORMAT_SIGNATURES
 
 
-def validate_and_stats(data: list[dict], expected_format: str | None = None) -> dict:
+def validate_and_stats(data: list[dict], expected_format: Optional[str] = None) -> dict:
     """Compute stats and validate dataset."""
     if not data:
         return {
diff --git a/soup_cli/monitoring/display.py b/soup_cli/monitoring/display.py
index af78b65..b48e947 100644
--- a/soup_cli/monitoring/display.py
+++ b/soup_cli/monitoring/display.py
@@ -1,5 +1,7 @@
 """Rich live training dashboard in the terminal."""
 
+from typing import Optional
+
 from rich.console import Console
 from rich.live import Live
 from rich.panel import Panel
@@ -23,7 +25,7 @@ class TrainingDisplay:
         self.grad_norm = 0.0
         self.gpu_mem = ""
         self.speed = 0.0
-        self._live: Live | None = None
+        self._live: Optional[Live] = None
 
     def start(self, total_steps: int):
         """Start the live display."""