fix(resource): update validate_clone_into_url to raise ValueError for invalid URLs

- Change validate_clone_into_url() return type from bool to None
- Raise ValueError for empty or invalid git repository URLs
- Update BDD steps to catch ValueError and set clone_url_valid accordingly
- Aligns with contract requirement from PR #8304 review feedback

features/steps/container_clone_into_steps.py

@@ -25,13 +25,25 @@ from cleveragents.resource.handlers.clone_into import (
 @when('I validate clone-into URL "{url}"')
 def step_validate_url(context: Context, url: str) -> None:
     """Validate a clone-into URL."""
-    context.clone_url_valid = validate_clone_into_url(url)
+    context.clone_url_error = None
+    try:
+        validate_clone_into_url(url)
+        context.clone_url_valid = True
+    except ValueError as exc:
+        context.clone_url_valid = False
+        context.clone_url_error = exc
 
 
 @when("I validate clone-into URL with whitespace only")
 def step_validate_whitespace_url(context: Context) -> None:
     """Validate a whitespace-only clone-into URL."""
-    context.clone_url_valid = validate_clone_into_url("   ")
+    context.clone_url_error = None
+    try:
+        validate_clone_into_url("   ")
+        context.clone_url_valid = True
+    except ValueError as exc:
+        context.clone_url_valid = False
+        context.clone_url_error = exc
 
 
 @when("I call clone_repo_into_container with empty container_id")

src/cleveragents/resource/handlers/clone_into.py

@@ -131,7 +131,7 @@ def clone_repo_into_container(
     return target_dir
 
 
-def validate_clone_into_url(url: str) -> bool:
+def validate_clone_into_url(url: str) -> None:
     """Validate that a URL is a plausible git repository URL.
 
     Accepts:
@@ -143,12 +143,11 @@ def validate_clone_into_url(url: str) -> bool:
     Args:
         url: The URL string to validate.
 
-    Returns:
-        ``True`` if the URL looks like a valid git repository URL,
-        ``False`` otherwise.
+    Raises:
+        ValueError: If the URL is empty or does not match any valid prefix.
     """
     if not url or not url.strip():
-        return False
+        raise ValueError("URL must be a non-empty string")
     url = url.strip()
     valid_prefixes = (
         "https://",
@@ -160,4 +159,8 @@ def validate_clone_into_url(url: str) -> bool:
         "./",
         "../",
     )
-    return any(url.startswith(prefix) for prefix in valid_prefixes)
+    if not any(url.startswith(prefix) for prefix in valid_prefixes):
+        raise ValueError(
+            f"Invalid git repository URL: {url!r}. "
+            f"Must start with one of: {', '.join(valid_prefixes)}"
+        )