Fix dependency parsing for dict format in tool configs

- Normalize dependencies in Tool.from_dict() to handle both string and dict formats
- Dict format: {name: "tts", version: "*"} → extracts just the name for Tool.dependencies
- Fixes "unhashable type: dict" error in check_dependencies()

This allows tools to declare dependencies with version constraints in config.yaml:
  dependencies:
    - name: tts
      version: "*"

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cmdforge/tool.py

@@ -220,6 +220,16 @@ class Tool:
         if "source" in data:
             source = ToolSource.from_dict(data["source"])
 
+        # Normalize dependencies - can be strings or dicts with name/version
+        raw_deps = data.get("dependencies", [])
+        dependencies = []
+        for dep in raw_deps:
+            if isinstance(dep, str):
+                dependencies.append(dep)
+            elif isinstance(dep, dict) and "name" in dep:
+                dependencies.append(dep["name"])
+            # Skip invalid entries
+
         return cls(
             name=data["name"],
             description=data.get("description", ""),
@@ -227,7 +237,7 @@ class Tool:
             arguments=arguments,
             steps=steps,
             output=data.get("output", "{input}"),
-            dependencies=data.get("dependencies", []),
+            dependencies=dependencies,
             source=source,
             version=data.get("version", ""),
         )