Add cmdforge remove command for project dependencies

- `cmdforge remove <tool>` removes a dependency from cmdforge.yaml
- Matches by exact name or short name (e.g., both "eli5" and "official/eli5" work)
- Returns exit code 1 if dependency not found
- Complements `cmdforge add` for full manifest management

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/cmdforge/cli/project_commands.py

@@ -416,6 +416,39 @@ def cmd_add(args):
     return 0
 
 
+def cmd_remove(args):
+    """Remove a tool from project dependencies."""
+    tool_spec = args.tool
+
+    # Find manifest
+    manifest_path = find_manifest()
+    if not manifest_path:
+        print("No cmdforge.yaml found in current project.")
+        print("Nothing to remove.")
+        return 1
+
+    manifest = load_manifest(manifest_path)
+
+    # Parse tool spec to get the name
+    parsed = ToolSpec.parse(tool_spec)
+    tool_name = parsed.full_name
+
+    # Remove from manifest
+    if manifest.remove_dependency(tool_name):
+        save_manifest(manifest, manifest_path)
+        print(f"Removed {tool_name} from {manifest_path.name}")
+    else:
+        # Try without owner prefix
+        if manifest.remove_dependency(parsed.name):
+            save_manifest(manifest, manifest_path)
+            print(f"Removed {parsed.name} from {manifest_path.name}")
+        else:
+            print(f"Dependency '{tool_name}' not found in {manifest_path.name}")
+            return 1
+
+    return 0
+
+
 def cmd_init(args):
     """Initialize a new cmdforge.yaml."""
     manifest_path = Path.cwd() / MANIFEST_FILENAME